[PATCH v3 0/2] Add Amlogic A9 I3C support

From: Junyi Zhao via B4 Relay <devnull+junyi.zhao.amlogic.com@kernel.org>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	 Frank Li <Frank.Li@nxp.com>, Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	 Neil Armstrong <neil.armstrong@linaro.org>,
	 Kevin Hilman <khilman@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	 Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	 Miquel Raynal <miquel.raynal@bootlin.com>,
	Kees Cook <kees@kernel.org>,
	 "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-i3c@lists.infradead.org, devicetree@vger.kernel.org,
	 linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-amlogic@lists.infradead.org, imx@lists.linux.dev,
	 linux-hardening@vger.kernel.org, xianwei.zhao@amlogic.com,
	 Kelvin.Zhang@amlogic.com, Junyi Zhao <junyi.zhao@amlogic.com>
Subject: [PATCH v3 0/2] Add Amlogic A9 I3C support
Date: Fri, 06 Nov 2026 15:13:07 +0800	[thread overview]
Message-ID: <20261106-a9_i3c-v3-0-804b69b9095b@amlogic.com> (raw)

Amlogic A9 SoCs integrate the Silvaco I3C IP, but their peripheral
clock setup differs from the original implementation: the EE-domain
controller (amlogic,a9-i3c) takes two clocks, "pclk" and "fast_clk",
while the AO-domain controller (amlogic,a9-ao-i3c) exposes only
"pclk" and derives its bus clock from an internal divider inside the
controller's own register region.

This series consists of:

  - Add a vendor_init callback for the clock setup and an
    Amlogic-specific bit (AML_I3C_QUIRK_AO) for AO-specific behaviour
    to the Silvaco I3C master driver, and enable the existing
    Silvaco workaround quirks for both Amlogic variants.

  - Add the Amlogic compatibles and per-variant clock
    constraints to the silvaco,i3c-master binding schema.

Verified on Amlogic A9 (BY401) with both EE and AO controller
instances. dt_binding_check and dtbs_check pass with this series.

Signed-off-by: Junyi Zhao <junyi.zhao@amlogic.com>
---
Changes in v3:
  - Merge vendor quirks into the legacy quirks bitmask and add
    AML_I3C_QUIRK_AO for the AO variant.
  - Check the devm_kcalloc() return value when allocating the new
    clk bulk array.
  - Enable the clocks before aml_ao_i3c_tail_clocks(), because the
    divider registers are accessed during registration.
  - Rework the probe error paths so the clocks are disabled when
    vendor_init or later steps fail.
  - Reorder the local variables (longest first).
  - Convert comments to kernel-doc format.
  - Depend on COMMON_CLK in Kconfig.
  - Drop the silvaco,i3c-master-v1 fallback and add a blank line
    before the new if/then block in the binding.
  - Explain the I3C peripheral integration details in the binding
    commit message.

- Link to v2: https://patch.msgid.link/20261102-a9_i3c-v2-0-0c474bfccffa@amlogic.com

Changes in v2:

  - No need rework the Silvaco I3C driver. 
  - Based on vanilla driver, adapt A9 SoCs through callback 
    and quirks to handle the variant.

- Link to v1: https://patch.msgid.link/20261019-a9_i3c-v1-0-329d819d621f@amlogic.com

---
Junyi Zhao (2):
      i3c: master: svc: Add amlogic a9 support
      dt-bindings: i3c: silvaco,i3c-master: Add Amlogic A9 support

 .../bindings/i3c/silvaco,i3c-master.yaml           |  26 +-
 drivers/i3c/master/Kconfig                         |   1 +
 drivers/i3c/master/svc-i3c-master.c                | 274 ++++++++++++++++++++-
 3 files changed, 287 insertions(+), 14 deletions(-)
---
base-commit: aac26bee2287c88af5be5a5ff96d783b19a28790
change-id: 20261010-a9_i3c-9d5245d094c8

Best regards,
--  
Junyi Zhao <junyi.zhao@amlogic.com>

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