[PATCH v6 00/16] ASoC: rsnd: Add RZ/G3E audio driver support

[John Madieu <john.madieu.xa@bp.renesas.com>]

Add audio support for the Renesas RZ/G3E SoC to the R-Car Sound
driver. The RZ/G3E audio subsystem is based on R-Car Sound IP but
has several differences requiring dedicated handling:

  - SSI operates exclusively in BUSIF mode (no PIO)
  - 2-4 BUSIF channels per SSI (layout differs from R-Car)
  - Separate register regions for SCU, ADG, SSIU, SSI accessed by name
  - Per-SSI ADG and SSIF supply clocks
  - Dedicated audmacpp clock/reset for Audio DMAC peri-peri
  - Per-SSI and per-module reset controllers via CPG
  - Unprefixed DT sub-node names (ssi, ssiu, src, ...) instead of
    rcar_sound,xxx
  - Hyphenated indexed clock/reset names (ssi-0, src-0, adg-ssi-0,
    audio-clka, ...) instead of the legacy dotted form

Link to v5 at [1].

Changes:

v6:
 - Rename all indexed clock-names and reset-names from the dotted form
   ("ssi.0", "src.0", "adg.ssi.0", "clk_a", ...) to the hyphenated form
   ("ssi-0", "src-0", "adg-ssi-0", "audio-clka", ...).
 - DT binding: tighten #sound-dai-cells to const: 1, drop the unused
   clock-frequency and clkout-lr-asynchronous properties.
 - Add a new preparatory patch to handle the hyphenated DT name first and
   fall back to the legacy dotted form, so existing R-Car DTs keep
   working unchanged while new bindings can use the hyphenated convention.
 - Convert the SSI, SRC, CTU, DVC and MIX probes to the helpers and drop
   the per-module name buffers and NAME_SIZE defines.
 - Add a new patch adding a third clkin name table for RZ/G3E and
   dispatching to it in the same style as the existing Gen4
   branch. CLKA/B/C/I enum values, the clkin[] array and the
   BRGA/BRGB derivation are unchanged; only the DT lookup names
   differ and use the hyphenated form.
 - audmacpp: enable the clock before deasserting the reset so the
   block sees a stable clock on the way out of reset (and mirror
   the ordering on suspend/resume).
 - SRC: use devm_clk_get_optional_enabled() for scu_supply and drop
   the manual prepare/enable in rsnd_src_init()/rsnd_src_quit(),
   so scu_supply has the same lifetime as scu/scu_x2.
 - adg: simplify the per-SSI ADG and SSIF supply clock
 - Strip out the "rcar_sound," from binding, DT, and add corresponding
   code support.
 - suspend/resume: respect the probe ordering in
   rsnd_dma_suspend()/_resume() (assert reset before disabling
   clock on suspend; enable clock before deasserting reset on
   resume)
 - Guard rsnd_src_suspend()/_resume() so platforms without SRC are safe.

v5:
 - Drop the rsnd.yaml binding split (patches 01/12 and 02/12 from v4).
 - Extract RSND_SOC_MASK fix as a standalone bug-fix patch (was
   previously embedded in patch 04) per Kuninori's request.
 - Split the DMA refactor out of patch 06/12 into its own
   preparatory patch, so the struct/lookup introduction and the
   RZ/G3E address tables are in separate commits.
 - Add new patch "Support unprefixed DT node names for RZ/G3E"
   converting rsnd_parse_of_node() to a function that tries the
   legacy rcar_sound, prefix first, then falls back to the bare
   name.
 - Simplify flags layout comment per Kuninori's feedback.
 - Add comment clarifying that clock/reset acquisition is optional
   and no-error when absent from DT, and drop spurious blank line
   in rsnd.h.
 - Move RZ/G3E DMA address comment to rsnd_rzg3e_dma_addr(), not
   the shared header. Separate the line-wrap-only change in
   rsnd_gen2_dma_addr() into the preparatory patch only.

v4:
 - Add reset_control_assert() in rsnd_mod_quit() for symmetry with
   deassert in rsnd_mod_init() (Mark Brown)
 - Fix RSND_SOC_MASK to (0xF << 4) to avoid overlap with
   RSND_RZ_MASK. Add nibble layout comment documenting the flag
   bit allocation.
 - Move audmapp_clk and audmapp_rstc from struct rsnd_priv into
   struct rsnd_dma_ctrl.
 - Replace raw [3][2][3] DMA address array with named structs
   (rsnd_dma_addr_dir, rsnd_dma_addr_map) for self-documenting
   table initializers.
 - Move busif_status_count from file-static into new
   struct rsnd_ssiu_ctrl, following the rsnd_dma_ctrl pattern.
   Remove duplicate priv variable. Properly propagate reset errors
   via dev_err_probe().
 - Clarify commit message regarding PIO mode still being available
   on R-Car.
 - Collapse dev_err_probe() and rsnd_mod_init() calls to single
   lines.
 - Move per-SSI ADG and SSIF supply clock prepare/unprepare into
   rsnd_adg_clk_control() instead of separate functions.
 - Move shared SCU clocks from file-statics into new
   struct rsnd_src_ctrl.
 - Merge rsnd_adg_mod_get() helper directly into the suspend/resume
   patch.
 - Drop former patch 12/14 "Add rsnd_adg_mod_get() for PM support".
 - Drop former patch 13/14 "Export rsnd_ssiu_mod_get() for PM
   support".

v3:
 - Split out from v2 series [2] to ASoC-specific patchset.

v2:
 - Split of rsnd.yaml into common and R-Car-specific schemas.
 - Introduce RZ/G3E sound binding as a standalone schema.
 - Addressed Kuninori's comments (details in individual patches).

[1] https://lore.kernel.org/all/20260415124731.3684773-1-john.madieu.xa@bp.renesas.com/
[2] https://lore.kernel.org/all/20260402090524.9137-1-john.madieu.xa@bp.renesas.com/

John Madieu (16):
  ASoC: dt-bindings: sound: Add DT binding for RZ/G3E sound
  ASoC: rsnd: Fix RSND_SOC_MASK width to single nibble
  ASoC: rsnd: Add reset controller support to rsnd_mod
  ASoC: rsnd: Support hyphen or dot in indexed clock and reset names
  ASoC: rsnd: Add RZ/G3E SoC probing and register map
  ASoC: rsnd: Add audmacpp clock and reset support for RZ/G3E
  ASoC: rsnd: Refactor DMA address tables with named structs
  ASoC: rsnd: Add RZ/G3E DMA address calculation support
  ASoC: rsnd: ssui: Add RZ/G3E SSIU BUSIF support
  ASoC: rsnd: Add SSI reset support for RZ/G3E platform
  ASoC: rsnd: Add ADG reset support for RZ/G3E
  ASoC: rsnd: adg: Add per-SSI ADG and SSIF supply clock management
  ASoC: rsnd: adg: Look up RZ/G3E clkin under audio-clk{a,b,c,i}
  ASoC: rsnd: src: Add SRC reset and clock support for RZ/G3E
  ASoC: rsnd: Support unprefixed DT node names for RZ/G3E
  ASoC: rsnd: Add system suspend/resume support

 .../sound/renesas,r9a09g047-sound.yaml        | 743 ++++++++++++++++++
 sound/soc/renesas/rcar/adg.c                  | 130 ++-
 sound/soc/renesas/rcar/cmd.c                  |   2 +-
 sound/soc/renesas/rcar/core.c                 | 162 +++-
 sound/soc/renesas/rcar/ctu.c                  |  29 +-
 sound/soc/renesas/rcar/dma.c                  | 280 +++++--
 sound/soc/renesas/rcar/dvc.c                  |  29 +-
 sound/soc/renesas/rcar/gen.c                  | 180 +++++
 sound/soc/renesas/rcar/mix.c                  |  29 +-
 sound/soc/renesas/rcar/rsnd.h                 |  73 +-
 sound/soc/renesas/rcar/src.c                  |  91 ++-
 sound/soc/renesas/rcar/ssi.c                  |  49 +-
 sound/soc/renesas/rcar/ssiu.c                 |  91 ++-
 13 files changed, 1763 insertions(+), 125 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/renesas,r9a09g047-sound.yaml

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2.25.1