Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

4 files changed, 600 insertions, 0 deletions

diff --git a/sound/soc/adi/Kconfig b/sound/soc/adi/Kconfig
new file mode 100644
index 000000000..0236dc5b4
--- /dev/null
+++ b/sound/soc/adi/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SND_SOC_ADI
+	tristate "Audio support for Analog Devices reference designs"
+	help
+	  Audio support for various reference designs by Analog Devices.
+
+config SND_SOC_ADI_AXI_I2S
+	tristate "AXI-I2S support"
+	depends on SND_SOC_ADI
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	select REGMAP_MMIO
+	help
+	  ASoC driver for the Analog Devices AXI-I2S softcore peripheral.
+
+config SND_SOC_ADI_AXI_SPDIF
+	tristate "AXI-SPDIF support"
+	depends on SND_SOC_ADI
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	select REGMAP_MMIO
+	help
+	  ASoC driver for the Analog Devices AXI-SPDIF softcore peripheral.
diff --git a/sound/soc/adi/Makefile b/sound/soc/adi/Makefile
new file mode 100644
index 000000000..125f667b0
--- /dev/null
+++ b/sound/soc/adi/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+snd-soc-adi-axi-i2s-objs := axi-i2s.o
+snd-soc-adi-axi-spdif-objs := axi-spdif.o
+
+obj-$(CONFIG_SND_SOC_ADI_AXI_I2S) += snd-soc-adi-axi-i2s.o
+obj-$(CONFIG_SND_SOC_ADI_AXI_SPDIF) += snd-soc-adi-axi-spdif.o
diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c
new file mode 100644
index 000000000..b1342351b
--- /dev/null
+++ b/sound/soc/adi/axi-i2s.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2013, Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#define AXI_I2S_REG_RESET	0x00
+#define AXI_I2S_REG_CTRL	0x04
+#define AXI_I2S_REG_CLK_CTRL	0x08
+#define AXI_I2S_REG_STATUS	0x10
+
+#define AXI_I2S_REG_RX_FIFO	0x28
+#define AXI_I2S_REG_TX_FIFO	0x2C
+
+#define AXI_I2S_RESET_GLOBAL	BIT(0)
+#define AXI_I2S_RESET_TX_FIFO	BIT(1)
+#define AXI_I2S_RESET_RX_FIFO	BIT(2)
+
+#define AXI_I2S_CTRL_TX_EN	BIT(0)
+#define AXI_I2S_CTRL_RX_EN	BIT(1)
+
+/* The frame size is configurable, but for now we always set it 64 bit */
+#define AXI_I2S_BITS_PER_FRAME 64
+
+struct axi_i2s {
+	struct regmap *regmap;
+	struct clk *clk;
+	struct clk *clk_ref;
+
+	bool   has_capture;
+	bool   has_playback;
+
+	struct snd_soc_dai_driver dai_driver;
+
+	struct snd_dmaengine_dai_dma_data capture_dma_data;
+	struct snd_dmaengine_dai_dma_data playback_dma_data;
+
+	struct snd_ratnum ratnum;
+	struct snd_pcm_hw_constraint_ratnums rate_constraints;
+};
+
+static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+	struct snd_soc_dai *dai)
+{
+	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	unsigned int mask, val;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+		mask = AXI_I2S_CTRL_RX_EN;
+	else
+		mask = AXI_I2S_CTRL_TX_EN;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		val = mask;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		val = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);
+
+	return 0;
+}
+
+static int axi_i2s_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	unsigned int bclk_div, word_size;
+	unsigned int bclk_rate;
+
+	bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;
+
+	word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;
+	bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;
+
+	regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) |
+		bclk_div);
+
+	return 0;
+}
+
+static int axi_i2s_startup(struct snd_pcm_substream *substream,
+	struct snd_soc_dai *dai)
+{
+	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	uint32_t mask;
+	int ret;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+		mask = AXI_I2S_RESET_RX_FIFO;
+	else
+		mask = AXI_I2S_RESET_TX_FIFO;
+
+	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);
+
+	ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
+			   SNDRV_PCM_HW_PARAM_RATE,
+			   &i2s->rate_constraints);
+	if (ret)
+		return ret;
+
+	return clk_prepare_enable(i2s->clk_ref);
+}
+
+static void axi_i2s_shutdown(struct snd_pcm_substream *substream,
+	struct snd_soc_dai *dai)
+{
+	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	clk_disable_unprepare(i2s->clk_ref);
+}
+
+static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	snd_soc_dai_init_dma_data(
+		dai,
+		i2s->has_playback ? &i2s->playback_dma_data : NULL,
+		i2s->has_capture  ? &i2s->capture_dma_data  : NULL);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
+	.startup = axi_i2s_startup,
+	.shutdown = axi_i2s_shutdown,
+	.trigger = axi_i2s_trigger,
+	.hw_params = axi_i2s_hw_params,
+};
+
+static struct snd_soc_dai_driver axi_i2s_dai = {
+	.probe = axi_i2s_dai_probe,
+	.ops = &axi_i2s_dai_ops,
+	.symmetric_rate = 1,
+};
+
+static const struct snd_soc_component_driver axi_i2s_component = {
+	.name = "axi-i2s",
+	.legacy_dai_naming = 1,
+};
+
+static const struct regmap_config axi_i2s_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = AXI_I2S_REG_STATUS,
+};
+
+static void axi_i2s_parse_of(struct axi_i2s *i2s, const struct device_node *np)
+{
+	struct property *dma_names;
+	const char *dma_name;
+
+	of_property_for_each_string(np, "dma-names", dma_names, dma_name) {
+		if (strcmp(dma_name, "rx") == 0)
+			i2s->has_capture = true;
+		if (strcmp(dma_name, "tx") == 0)
+			i2s->has_playback = true;
+	}
+}
+
+static int axi_i2s_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct axi_i2s *i2s;
+	void __iomem *base;
+	int ret;
+
+	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
+	if (!i2s)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, i2s);
+
+	axi_i2s_parse_of(i2s, pdev->dev.of_node);
+
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+		&axi_i2s_regmap_config);
+	if (IS_ERR(i2s->regmap))
+		return PTR_ERR(i2s->regmap);
+
+	i2s->clk = devm_clk_get(&pdev->dev, "axi");
+	if (IS_ERR(i2s->clk))
+		return PTR_ERR(i2s->clk);
+
+	i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
+	if (IS_ERR(i2s->clk_ref))
+		return PTR_ERR(i2s->clk_ref);
+
+	ret = clk_prepare_enable(i2s->clk);
+	if (ret)
+		return ret;
+
+	if (i2s->has_playback) {
+		axi_i2s_dai.playback.channels_min = 2;
+		axi_i2s_dai.playback.channels_max = 2;
+		axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT;
+		axi_i2s_dai.playback.formats =
+			SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;
+
+		i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
+		i2s->playback_dma_data.addr_width = 4;
+		i2s->playback_dma_data.maxburst = 1;
+	}
+
+	if (i2s->has_capture) {
+		axi_i2s_dai.capture.channels_min = 2;
+		axi_i2s_dai.capture.channels_max = 2;
+		axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT;
+		axi_i2s_dai.capture.formats =
+			SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;
+
+		i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
+		i2s->capture_dma_data.addr_width = 4;
+		i2s->capture_dma_data.maxburst = 1;
+	}
+
+	i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
+	i2s->ratnum.den_step = 1;
+	i2s->ratnum.den_min = 1;
+	i2s->ratnum.den_max = 64;
+
+	i2s->rate_constraints.rats = &i2s->ratnum;
+	i2s->rate_constraints.nrats = 1;
+
+	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,
+					 &axi_i2s_dai, 1);
+	if (ret)
+		goto err_clk_disable;
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret)
+		goto err_clk_disable;
+
+	dev_info(&pdev->dev, "probed, capture %s, playback %s\n",
+		 i2s->has_capture ? "enabled" : "disabled",
+		 i2s->has_playback ? "enabled" : "disabled");
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(i2s->clk);
+	return ret;
+}
+
+static int axi_i2s_dev_remove(struct platform_device *pdev)
+{
+	struct axi_i2s *i2s = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(i2s->clk);
+
+	return 0;
+}
+
+static const struct of_device_id axi_i2s_of_match[] = {
+	{ .compatible = "adi,axi-i2s-1.00.a", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, axi_i2s_of_match);
+
+static struct platform_driver axi_i2s_driver = {
+	.driver = {
+		.name = "axi-i2s",
+		.of_match_table = axi_i2s_of_match,
+	},
+	.probe = axi_i2s_probe,
+	.remove = axi_i2s_dev_remove,
+};
+module_platform_driver(axi_i2s_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("AXI I2S driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/adi/axi-spdif.c b/sound/soc/adi/axi-spdif.c
new file mode 100644
index 000000000..51b968ea2
--- /dev/null
+++ b/sound/soc/adi/axi-spdif.c
@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2013, Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/dmaengine_pcm.h>
+
+#define AXI_SPDIF_REG_CTRL	0x0
+#define AXI_SPDIF_REG_STAT	0x4
+#define AXI_SPDIF_REG_TX_FIFO	0xc
+
+#define AXI_SPDIF_CTRL_TXDATA BIT(1)
+#define AXI_SPDIF_CTRL_TXEN BIT(0)
+#define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8
+#define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8)
+
+#define AXI_SPDIF_FREQ_44100	(0x0 << 6)
+#define AXI_SPDIF_FREQ_48000	(0x1 << 6)
+#define AXI_SPDIF_FREQ_32000	(0x2 << 6)
+#define AXI_SPDIF_FREQ_NA	(0x3 << 6)
+
+struct axi_spdif {
+	struct regmap *regmap;
+	struct clk *clk;
+	struct clk *clk_ref;
+
+	struct snd_dmaengine_dai_dma_data dma_data;
+
+	struct snd_ratnum ratnum;
+	struct snd_pcm_hw_constraint_ratnums rate_constraints;
+};
+
+static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+	struct snd_soc_dai *dai)
+{
+	struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+	unsigned int val;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		val = AXI_SPDIF_CTRL_TXDATA;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		val = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+		AXI_SPDIF_CTRL_TXDATA, val);
+
+	return 0;
+}
+
+static int axi_spdif_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate = params_rate(params);
+	unsigned int clkdiv, stat;
+
+	switch (params_rate(params)) {
+	case 32000:
+		stat = AXI_SPDIF_FREQ_32000;
+		break;
+	case 44100:
+		stat = AXI_SPDIF_FREQ_44100;
+		break;
+	case 48000:
+		stat = AXI_SPDIF_FREQ_48000;
+		break;
+	default:
+		stat = AXI_SPDIF_FREQ_NA;
+		break;
+	}
+
+	clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref),
+			rate * 64 * 2) - 1;
+	clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET;
+
+	regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat);
+	regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+		AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv);
+
+	return 0;
+}
+
+static int axi_spdif_dai_probe(struct snd_soc_dai *dai)
+{
+	struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+	snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
+
+	return 0;
+}
+
+static int axi_spdif_startup(struct snd_pcm_substream *substream,
+	struct snd_soc_dai *dai)
+{
+	struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+	int ret;
+
+	ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
+			   SNDRV_PCM_HW_PARAM_RATE,
+			   &spdif->rate_constraints);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(spdif->clk_ref);
+	if (ret)
+		return ret;
+
+	regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+		AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN);
+
+	return 0;
+}
+
+static void axi_spdif_shutdown(struct snd_pcm_substream *substream,
+	struct snd_soc_dai *dai)
+{
+	struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+	regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+		AXI_SPDIF_CTRL_TXEN, 0);
+
+	clk_disable_unprepare(spdif->clk_ref);
+}
+
+static const struct snd_soc_dai_ops axi_spdif_dai_ops = {
+	.startup = axi_spdif_startup,
+	.shutdown = axi_spdif_shutdown,
+	.trigger = axi_spdif_trigger,
+	.hw_params = axi_spdif_hw_params,
+};
+
+static struct snd_soc_dai_driver axi_spdif_dai = {
+	.probe = axi_spdif_dai_probe,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_KNOT,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = &axi_spdif_dai_ops,
+};
+
+static const struct snd_soc_component_driver axi_spdif_component = {
+	.name = "axi-spdif",
+	.legacy_dai_naming = 1,
+};
+
+static const struct regmap_config axi_spdif_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = AXI_SPDIF_REG_STAT,
+};
+
+static int axi_spdif_probe(struct platform_device *pdev)
+{
+	struct axi_spdif *spdif;
+	struct resource *res;
+	void __iomem *base;
+	int ret;
+
+	spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
+	if (!spdif)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, spdif);
+
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+					    &axi_spdif_regmap_config);
+	if (IS_ERR(spdif->regmap))
+		return PTR_ERR(spdif->regmap);
+
+	spdif->clk = devm_clk_get(&pdev->dev, "axi");
+	if (IS_ERR(spdif->clk))
+		return PTR_ERR(spdif->clk);
+
+	spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
+	if (IS_ERR(spdif->clk_ref))
+		return PTR_ERR(spdif->clk_ref);
+
+	ret = clk_prepare_enable(spdif->clk);
+	if (ret)
+		return ret;
+
+	spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO;
+	spdif->dma_data.addr_width = 4;
+	spdif->dma_data.maxburst = 1;
+
+	spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128;
+	spdif->ratnum.den_step = 1;
+	spdif->ratnum.den_min = 1;
+	spdif->ratnum.den_max = 64;
+
+	spdif->rate_constraints.rats = &spdif->ratnum;
+	spdif->rate_constraints.nrats = 1;
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component,
+					 &axi_spdif_dai, 1);
+	if (ret)
+		goto err_clk_disable;
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret)
+		goto err_clk_disable;
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(spdif->clk);
+	return ret;
+}
+
+static int axi_spdif_dev_remove(struct platform_device *pdev)
+{
+	struct axi_spdif *spdif = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(spdif->clk);
+
+	return 0;
+}
+
+static const struct of_device_id axi_spdif_of_match[] = {
+	{ .compatible = "adi,axi-spdif-tx-1.00.a", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, axi_spdif_of_match);
+
+static struct platform_driver axi_spdif_driver = {
+	.driver = {
+		.name = "axi-spdif",
+		.of_match_table = axi_spdif_of_match,
+	},
+	.probe = axi_spdif_probe,
+	.remove = axi_spdif_dev_remove,
+};
+module_platform_driver(axi_spdif_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("AXI SPDIF driver");
+MODULE_LICENSE("GPL");