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().
  ...

1 files changed, 600 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/ssiu.c b/sound/soc/sh/rcar/ssiu.c
new file mode 100644
index 000000000..281bc20d4
--- /dev/null
+++ b/sound/soc/sh/rcar/ssiu.c
@@ -0,0 +1,600 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Renesas R-Car SSIU support
+//
+// Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+
+#include "rsnd.h"
+
+#define SSIU_NAME "ssiu"
+
+struct rsnd_ssiu {
+	struct rsnd_mod mod;
+	u32 busif_status[8]; /* for BUSIF0 - BUSIF7 */
+	unsigned int usrcnt;
+	int id;
+	int id_sub;
+};
+
+/* SSI_MODE */
+#define TDM_EXT		(1 << 0)
+#define TDM_SPLIT	(1 << 8)
+
+#define rsnd_ssiu_nr(priv) ((priv)->ssiu_nr)
+#define rsnd_mod_to_ssiu(_mod) container_of((_mod), struct rsnd_ssiu, mod)
+#define for_each_rsnd_ssiu(pos, priv, i)				\
+	for (i = 0;							\
+	     (i < rsnd_ssiu_nr(priv)) &&				\
+		     ((pos) = ((struct rsnd_ssiu *)(priv)->ssiu + i));	\
+	     i++)
+
+/*
+ *	SSI	Gen2		Gen3
+ *	0	BUSIF0-3	BUSIF0-7
+ *	1	BUSIF0-3	BUSIF0-7
+ *	2	BUSIF0-3	BUSIF0-7
+ *	3	BUSIF0		BUSIF0-7
+ *	4	BUSIF0		BUSIF0-7
+ *	5	BUSIF0		BUSIF0
+ *	6	BUSIF0		BUSIF0
+ *	7	BUSIF0		BUSIF0
+ *	8	BUSIF0		BUSIF0
+ *	9	BUSIF0-3	BUSIF0-7
+ *	total	22		52
+ */
+static const int gen2_id[] = { 0, 4,  8, 12, 13, 14, 15, 16, 17, 18 };
+static const int gen3_id[] = { 0, 8, 16, 24, 32, 40, 41, 42, 43, 44 };
+
+/* enable busif buffer over/under run interrupt. */
+#define rsnd_ssiu_busif_err_irq_enable(mod)  rsnd_ssiu_busif_err_irq_ctrl(mod, 1)
+#define rsnd_ssiu_busif_err_irq_disable(mod) rsnd_ssiu_busif_err_irq_ctrl(mod, 0)
+static void rsnd_ssiu_busif_err_irq_ctrl(struct rsnd_mod *mod, int enable)
+{
+	int id = rsnd_mod_id(mod);
+	int shift, offset;
+	int i;
+
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		shift  = id;
+		offset = 0;
+		break;
+	case 9:
+		shift  = 1;
+		offset = 1;
+		break;
+	default:
+		return;
+	}
+
+	for (i = 0; i < 4; i++) {
+		enum rsnd_reg reg = SSI_SYS_INT_ENABLE((i * 2) + offset);
+		u32 val = 0xf << (shift * 4);
+		u32 sys_int_enable = rsnd_mod_read(mod, reg);
+
+		if (enable)
+			sys_int_enable |= val;
+		else
+			sys_int_enable &= ~val;
+		rsnd_mod_write(mod, reg, sys_int_enable);
+	}
+}
+
+bool rsnd_ssiu_busif_err_status_clear(struct rsnd_mod *mod)
+{
+	bool error = false;
+	int id = rsnd_mod_id(mod);
+	int shift, offset;
+	int i;
+
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		shift  = id;
+		offset = 0;
+		break;
+	case 9:
+		shift  = 1;
+		offset = 1;
+		break;
+	default:
+		goto out;
+	}
+
+	for (i = 0; i < 4; i++) {
+		u32 reg = SSI_SYS_STATUS(i * 2) + offset;
+		u32 status = rsnd_mod_read(mod, reg);
+		u32 val = 0xf << (shift * 4);
+
+		status &= val;
+		if (status) {
+			struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+			struct device *dev = rsnd_priv_to_dev(priv);
+
+			rsnd_print_irq_status(dev, "%s err status : 0x%08x\n",
+					      rsnd_mod_name(mod), status);
+			error = true;
+		}
+		rsnd_mod_write(mod, reg, val);
+	}
+out:
+	return error;
+}
+
+static u32 *rsnd_ssiu_get_status(struct rsnd_mod *mod,
+				 struct rsnd_dai_stream *io,
+				 enum rsnd_mod_type type)
+{
+	struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
+	int busif = rsnd_mod_id_sub(mod);
+
+	return &ssiu->busif_status[busif];
+}
+
+static int rsnd_ssiu_init(struct rsnd_mod *mod,
+			  struct rsnd_dai_stream *io,
+			  struct rsnd_priv *priv)
+{
+	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
+	u32 ssis = rsnd_ssi_multi_secondaries_runtime(io);
+	int use_busif = rsnd_ssi_use_busif(io);
+	int id = rsnd_mod_id(mod);
+	int is_clk_master = rsnd_rdai_is_clk_master(rdai);
+	u32 val1, val2;
+
+	/* clear status */
+	rsnd_ssiu_busif_err_status_clear(mod);
+
+	/*
+	 * SSI_MODE0
+	 */
+	rsnd_mod_bset(mod, SSI_MODE0, (1 << id), !use_busif << id);
+
+	/*
+	 * SSI_MODE1 / SSI_MODE2
+	 *
+	 * FIXME
+	 * sharing/multi with SSI0 are mainly supported
+	 */
+	val1 = rsnd_mod_read(mod, SSI_MODE1);
+	val2 = rsnd_mod_read(mod, SSI_MODE2);
+	if (rsnd_ssi_is_pin_sharing(io)) {
+
+		ssis |= (1 << id);
+
+	} else if (ssis) {
+		/*
+		 * Multi SSI
+		 *
+		 * set synchronized bit here
+		 */
+
+		/* SSI4 is synchronized with SSI3 */
+		if (ssis & (1 << 4))
+			val1 |= (1 << 20);
+		/* SSI012 are synchronized */
+		if (ssis == 0x0006)
+			val1 |= (1 << 4);
+		/* SSI0129 are synchronized */
+		if (ssis == 0x0206)
+			val2 |= (1 << 4);
+	}
+
+	/* SSI1 is sharing pin with SSI0 */
+	if (ssis & (1 << 1))
+		val1 |= is_clk_master ? 0x2 : 0x1;
+
+	/* SSI2 is sharing pin with SSI0 */
+	if (ssis & (1 << 2))
+		val1 |= is_clk_master ?	0x2 << 2 :
+					0x1 << 2;
+	/* SSI4 is sharing pin with SSI3 */
+	if (ssis & (1 << 4))
+		val1 |= is_clk_master ? 0x2 << 16 :
+					0x1 << 16;
+	/* SSI9 is sharing pin with SSI0 */
+	if (ssis & (1 << 9))
+		val2 |= is_clk_master ? 0x2 : 0x1;
+
+	rsnd_mod_bset(mod, SSI_MODE1, 0x0013001f, val1);
+	rsnd_mod_bset(mod, SSI_MODE2, 0x00000017, val2);
+
+	/*
+	 * Enable busif buffer over/under run interrupt.
+	 * It will be handled from ssi.c
+	 * see
+	 *	__rsnd_ssi_interrupt()
+	 */
+	rsnd_ssiu_busif_err_irq_enable(mod);
+
+	return 0;
+}
+
+static int rsnd_ssiu_quit(struct rsnd_mod *mod,
+			  struct rsnd_dai_stream *io,
+			  struct rsnd_priv *priv)
+{
+	/* disable busif buffer over/under run interrupt. */
+	rsnd_ssiu_busif_err_irq_disable(mod);
+
+	return 0;
+}
+
+static struct rsnd_mod_ops rsnd_ssiu_ops_gen1 = {
+	.name		= SSIU_NAME,
+	.init		= rsnd_ssiu_init,
+	.quit		= rsnd_ssiu_quit,
+	.get_status	= rsnd_ssiu_get_status,
+};
+
+static int rsnd_ssiu_init_gen2(struct rsnd_mod *mod,
+			       struct rsnd_dai_stream *io,
+			       struct rsnd_priv *priv)
+{
+	struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
+	u32 has_hdmi0 = rsnd_flags_has(io, RSND_STREAM_HDMI0);
+	u32 has_hdmi1 = rsnd_flags_has(io, RSND_STREAM_HDMI1);
+	int ret;
+	u32 mode = 0;
+
+	ret = rsnd_ssiu_init(mod, io, priv);
+	if (ret < 0)
+		return ret;
+
+	ssiu->usrcnt++;
+
+	/*
+	 * TDM Extend/Split Mode
+	 * see
+	 *	rsnd_ssi_config_init()
+	 */
+	if (rsnd_runtime_is_tdm(io))
+		mode = TDM_EXT;
+	else if (rsnd_runtime_is_tdm_split(io))
+		mode = TDM_SPLIT;
+
+	rsnd_mod_write(mod, SSI_MODE, mode);
+
+	if (rsnd_ssi_use_busif(io)) {
+		int id = rsnd_mod_id(mod);
+		int busif = rsnd_mod_id_sub(mod);
+		enum rsnd_reg adinr_reg, mode_reg, dalign_reg;
+
+		if ((id == 9) && (busif >= 4)) {
+			adinr_reg = SSI9_BUSIF_ADINR(busif);
+			mode_reg = SSI9_BUSIF_MODE(busif);
+			dalign_reg = SSI9_BUSIF_DALIGN(busif);
+		} else {
+			adinr_reg = SSI_BUSIF_ADINR(busif);
+			mode_reg = SSI_BUSIF_MODE(busif);
+			dalign_reg = SSI_BUSIF_DALIGN(busif);
+		}
+
+		rsnd_mod_write(mod, adinr_reg,
+			       rsnd_get_adinr_bit(mod, io) |
+			       (rsnd_io_is_play(io) ?
+				rsnd_runtime_channel_after_ctu(io) :
+				rsnd_runtime_channel_original(io)));
+		rsnd_mod_write(mod, mode_reg,
+			       rsnd_get_busif_shift(io, mod) | 1);
+		rsnd_mod_write(mod, dalign_reg,
+			       rsnd_get_dalign(mod, io));
+	}
+
+	if (has_hdmi0 || has_hdmi1) {
+		enum rsnd_mod_type rsnd_ssi_array[] = {
+			RSND_MOD_SSIM1,
+			RSND_MOD_SSIM2,
+			RSND_MOD_SSIM3,
+		};
+		struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
+		struct rsnd_mod *pos;
+		u32 val;
+		int i;
+
+		i = rsnd_mod_id(ssi_mod);
+
+		/* output all same SSI as default */
+		val =	i << 16 |
+			i << 20 |
+			i << 24 |
+			i << 28 |
+			i;
+
+		for_each_rsnd_mod_array(i, pos, io, rsnd_ssi_array) {
+			int shift = (i * 4) + 20;
+
+			val	= (val & ~(0xF << shift)) |
+				rsnd_mod_id(pos) << shift;
+		}
+
+		if (has_hdmi0)
+			rsnd_mod_write(mod, HDMI0_SEL, val);
+		if (has_hdmi1)
+			rsnd_mod_write(mod, HDMI1_SEL, val);
+	}
+
+	return 0;
+}
+
+static int rsnd_ssiu_start_gen2(struct rsnd_mod *mod,
+				struct rsnd_dai_stream *io,
+				struct rsnd_priv *priv)
+{
+	int busif = rsnd_mod_id_sub(mod);
+
+	if (!rsnd_ssi_use_busif(io))
+		return 0;
+
+	rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 1 << (busif * 4));
+
+	if (rsnd_ssi_multi_secondaries_runtime(io))
+		rsnd_mod_write(mod, SSI_CONTROL, 0x1);
+
+	return 0;
+}
+
+static int rsnd_ssiu_stop_gen2(struct rsnd_mod *mod,
+			       struct rsnd_dai_stream *io,
+			       struct rsnd_priv *priv)
+{
+	struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
+	int busif = rsnd_mod_id_sub(mod);
+
+	if (!rsnd_ssi_use_busif(io))
+		return 0;
+
+	rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 0);
+
+	if (--ssiu->usrcnt)
+		return 0;
+
+	if (rsnd_ssi_multi_secondaries_runtime(io))
+		rsnd_mod_write(mod, SSI_CONTROL, 0);
+
+	return 0;
+}
+
+static int rsnd_ssiu_id(struct rsnd_mod *mod)
+{
+	struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
+
+	/* see rsnd_ssiu_probe() */
+	return ssiu->id;
+}
+
+static int rsnd_ssiu_id_sub(struct rsnd_mod *mod)
+{
+	struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
+
+	/* see rsnd_ssiu_probe() */
+	return ssiu->id_sub;
+}
+
+static struct dma_chan *rsnd_ssiu_dma_req(struct rsnd_dai_stream *io,
+					  struct rsnd_mod *mod)
+{
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	int is_play = rsnd_io_is_play(io);
+	char *name;
+
+	/*
+	 * It should use "rcar_sound,ssiu" on DT.
+	 * But, we need to keep compatibility for old version.
+	 *
+	 * If it has "rcar_sound.ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" will be used.
+	 * see
+	 *	rsnd_ssi_dma_req()
+	 *	rsnd_dma_of_path()
+	 */
+
+	name = is_play ? "rx" : "tx";
+
+	return rsnd_dma_request_channel(rsnd_ssiu_of_node(priv),
+					SSIU_NAME, mod, name);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void rsnd_ssiu_debug_info(struct seq_file *m,
+				 struct rsnd_dai_stream *io,
+				struct rsnd_mod *mod)
+{
+	rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SSIU,
+				  rsnd_mod_id(mod) * 0x80, 0x80);
+}
+#define DEBUG_INFO .debug_info = rsnd_ssiu_debug_info
+#else
+#define DEBUG_INFO
+#endif
+
+static struct rsnd_mod_ops rsnd_ssiu_ops_gen2 = {
+	.name		= SSIU_NAME,
+	.dma_req	= rsnd_ssiu_dma_req,
+	.init		= rsnd_ssiu_init_gen2,
+	.quit		= rsnd_ssiu_quit,
+	.start		= rsnd_ssiu_start_gen2,
+	.stop		= rsnd_ssiu_stop_gen2,
+	.get_status	= rsnd_ssiu_get_status,
+	DEBUG_INFO
+};
+
+static struct rsnd_mod *rsnd_ssiu_mod_get(struct rsnd_priv *priv, int id)
+{
+	if (WARN_ON(id < 0 || id >= rsnd_ssiu_nr(priv)))
+		id = 0;
+
+	return rsnd_mod_get((struct rsnd_ssiu *)(priv->ssiu) + id);
+}
+
+static void rsnd_parse_connect_ssiu_compatible(struct rsnd_priv *priv,
+					       struct rsnd_dai_stream *io)
+{
+	struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
+	struct rsnd_ssiu *ssiu;
+	int is_dma_mode;
+	int i;
+
+	if (!ssi_mod)
+		return;
+
+	is_dma_mode = rsnd_ssi_is_dma_mode(ssi_mod);
+
+	/* select BUSIF0 */
+	for_each_rsnd_ssiu(ssiu, priv, i) {
+		struct rsnd_mod *mod = rsnd_mod_get(ssiu);
+
+		if (is_dma_mode &&
+		    (rsnd_mod_id(ssi_mod) == rsnd_mod_id(mod)) &&
+		    (rsnd_mod_id_sub(mod) == 0)) {
+			rsnd_dai_connect(mod, io, mod->type);
+			return;
+		}
+	}
+}
+
+void rsnd_parse_connect_ssiu(struct rsnd_dai *rdai,
+			     struct device_node *playback,
+			     struct device_node *capture)
+{
+	struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
+	struct device *dev = rsnd_priv_to_dev(priv);
+	struct device_node *node = rsnd_ssiu_of_node(priv);
+	struct rsnd_dai_stream *io_p = &rdai->playback;
+	struct rsnd_dai_stream *io_c = &rdai->capture;
+
+	/* use rcar_sound,ssiu if exist */
+	if (node) {
+		struct device_node *np;
+		int i = 0;
+
+		for_each_child_of_node(node, np) {
+			struct rsnd_mod *mod;
+
+			i = rsnd_node_fixed_index(dev, np, SSIU_NAME, i);
+			if (i < 0) {
+				of_node_put(np);
+				break;
+			}
+
+			mod = rsnd_ssiu_mod_get(priv, i);
+
+			if (np == playback)
+				rsnd_dai_connect(mod, io_p, mod->type);
+			if (np == capture)
+				rsnd_dai_connect(mod, io_c, mod->type);
+			i++;
+		}
+
+		of_node_put(node);
+	}
+
+	/* Keep DT compatibility */
+	if (!rsnd_io_to_mod_ssiu(io_p))
+		rsnd_parse_connect_ssiu_compatible(priv, io_p);
+	if (!rsnd_io_to_mod_ssiu(io_c))
+		rsnd_parse_connect_ssiu_compatible(priv, io_c);
+}
+
+int rsnd_ssiu_probe(struct rsnd_priv *priv)
+{
+	struct device *dev = rsnd_priv_to_dev(priv);
+	struct device_node *node;
+	struct rsnd_ssiu *ssiu;
+	struct rsnd_mod_ops *ops;
+	const int *list = NULL;
+	int i, nr;
+
+	/*
+	 * Keep DT compatibility.
+	 * if it has "rcar_sound,ssiu", use it.
+	 * if not, use "rcar_sound,ssi"
+	 * see
+	 *	rsnd_ssiu_bufsif_to_id()
+	 */
+	node = rsnd_ssiu_of_node(priv);
+	if (node)
+		nr = rsnd_node_count(priv, node, SSIU_NAME);
+	else
+		nr = priv->ssi_nr;
+
+	if (!nr)
+		return -EINVAL;
+
+	ssiu	= devm_kcalloc(dev, nr, sizeof(*ssiu), GFP_KERNEL);
+	if (!ssiu)
+		return -ENOMEM;
+
+	priv->ssiu	= ssiu;
+	priv->ssiu_nr	= nr;
+
+	if (rsnd_is_gen1(priv))
+		ops = &rsnd_ssiu_ops_gen1;
+	else
+		ops = &rsnd_ssiu_ops_gen2;
+
+	/* Keep compatibility */
+	nr = 0;
+	if ((node) &&
+	    (ops == &rsnd_ssiu_ops_gen2)) {
+		ops->id		= rsnd_ssiu_id;
+		ops->id_sub	= rsnd_ssiu_id_sub;
+
+		if (rsnd_is_gen2(priv)) {
+			list	= gen2_id;
+			nr	= ARRAY_SIZE(gen2_id);
+		} else if (rsnd_is_gen3(priv)) {
+			list	= gen3_id;
+			nr	= ARRAY_SIZE(gen3_id);
+		} else {
+			dev_err(dev, "unknown SSIU\n");
+			return -ENODEV;
+		}
+	}
+
+	for_each_rsnd_ssiu(ssiu, priv, i) {
+		int ret;
+
+		if (node) {
+			int j;
+
+			/*
+			 * see
+			 *	rsnd_ssiu_get_id()
+			 *	rsnd_ssiu_get_id_sub()
+			 */
+			for (j = 0; j < nr; j++) {
+				if (list[j] > i)
+					break;
+				ssiu->id	= j;
+				ssiu->id_sub	= i - list[ssiu->id];
+			}
+		} else {
+			ssiu->id = i;
+		}
+
+		ret = rsnd_mod_init(priv, rsnd_mod_get(ssiu),
+				    ops, NULL, RSND_MOD_SSIU, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void rsnd_ssiu_remove(struct rsnd_priv *priv)
+{
+	struct rsnd_ssiu *ssiu;
+	int i;
+
+	for_each_rsnd_ssiu(ssiu, priv, i) {
+		rsnd_mod_quit(rsnd_mod_get(ssiu));
+	}
+}