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Wed, 4 Nov 2026 10:01:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793786464; bh=GkPWc5hCznn7HXFHBwX1ZIlu/ZMs6unOTa3W9BeK67w=; h=From:Subject:Date:To:Cc:Reply-To; b=LXZy/z2t3/PexzURPFvSN3arUJzuTEGhJUoodCTnPK09A40Qrf7TFJH92ewmMv3ai 4QcTQ9gWvkj+HzGxCnDcKWd8fYMVOYJjXQoW4crI1MJOES26Rpw9czeKgxu1bAPgb3 Hy7ZX6MqILkUcdRepuUCmxkl8jghH01ZAIyjAZR1BGJaDn7n9DIcfb6EBaYthhpb9r DsJufWHThi3VGpjpZMYo7wUuw0LXfTWETGIkZQX3C6t7vylOi+DWqu97S259Wz2/Rf 6eYlTUAvdPkgYhN75QFUinsobjduMC+FBE/Ipc4/yJe5jCdanNLHbgkr+4DP+gasD9 UcwjmEzBRWryw== Received: from nexus.subspace.kernel.org (localhost [IPv6:::1]) by lkml.kernel.org (Postfix) with ESMTP id CC8AC46D91; Wed, 4 Nov 2026 10:01:03 +0000 (UTC) From: Xianwei Zhao via B4 Relay Subject: [PATCH v7 0/2] i2c: Add driver support Amlogic A9 I2C Date: Wed, 04 Nov 2026 10:00:58 +0000 Message-Id: <20261104-a9-i2c-v7-0-b31f2b53faf4@amlogic.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAFoC62oC/23QTW7DIBAF4KtErEsLw39XvUfVBeAhRmrsCEdWq sh3L0StY9VdDryPJ+ZGJiwZJ/J6uJGCc57yONTBPB1I7P1wRJq7OhNgoJnjnHpHM0QKUhqLAKi tIDUc/IQ0FD/EvsVr5KXFBrxe2vW5YMrXe8/7R537PF3G8nWvnXk7/WkA+dswc8posL5zQeokv X3zp8/xmONzHE+kPTLDCjkDWCFUKBWKiIkbFdIeii10KxQVmiBYjJExJcQeygescoWyQuW5dsB VsOj2UG2hWKGq0OoEXey4cd0/f9Rb+FiObsvxXnPDE+j0By7L8g04HW4t2gEAAA== X-Change-ID: 20260911-a9-i2c-24478e22e683 To: Junyi Zhao , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Xianwei Zhao Cc: Junyi Zhao , linux-i2c@vger.kernel.org, linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Xianwei Zhao , Conor Dooley X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1793786462; l=2523; i=xianwei.zhao@amlogic.com; s=20251216; h=from:subject:message-id; bh=vW3AT4pvQk4g8bNIqB+xYCeCb73QmptprCE/Oot1+eM=; b=6BwzhTGQPeaRRMF8CT/qD/8uagFtJYqzJ8Hxp9dxdpThw0G1+iDqC3IOzlOM/xcE8SyqKVo12 3lqX6bmQoG4CgK2VdUY08TKnPxt5gXE4lxJSjKhGsp/wDDcFA8ziMVI X-Developer-Key: i=xianwei.zhao@amlogic.com; a=ed25519; pk=dWwxtWCxC6FHRurOmxEtr34SuBYU+WJowV/ZmRJ7H+k= X-Endpoint-Received: by B4 Relay for xianwei.zhao@amlogic.com/20251216 with auth_id=578 X-Original-From: Xianwei Zhao Reply-To: xianwei.zhao@amlogic.com Add a Device Tree binding and driver for the I2C controller found on the Amlogic A9 SoC. Signed-off-by: Xianwei Zhao --- Changes in v7: - Move complete(done) out of lock, and when state = idle not complete(done) in irq func. - Link to v6: https://lore.kernel.org/r/20261104-a9-i2c-v6-0-baa6171f26f8@amlogic.com Changes in v6: - use xfer instead of master_xfer interface, and when div=8 remain valid. - Optimized the function. - Link to v5: https://lore.kernel.org/r/20261103-a9-i2c-v5-0-86f2dcd179d8@amlogic.com Changes in v5: - Mask out I2C_FUNC_SMBUS_QUICK and return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK). - Link to v4: https://lore.kernel.org/r/20261102-a9-i2c-v4-0-5a169215b8e9@amlogic.com Changes in v4: - Repocess xfer len equal 0 use I2C_AQ_NO_ZERO_LEN, and Optimized the function. - Disable A9_RX_THRESH_READ/A9_TX_THRESH_WRITE enables of irq when xfer timeout. - Use guard(spinlock_irqsave) instead for direct call spinlock in xfer timeout process. - Link to v3: https://lore.kernel.org/r/20261029-a9-i2c-v3-0-7b30ccc00533@amlogic.com Changes in v3: - Based on the questions raised by the robot, the data flow was reorganized. - Some processing was optimized according to Andi's and Markus's suggestions. - Link to v2: https://lore.kernel.org/r/20261022-a9-i2c-v2-0-45e3cef175bf@amlogic.com Changes in v2: - dtbinding: make some minor modifications, suggestted by Conor and robot. - driver: Make some adjustments, including macro definitions, format adjustments, adding quirks, process optimization, and so on. According to Andi and robot's suggestion - Give up MAINTAINERS file the separate submission, make it together with the driver. - Link to v1: https://lore.kernel.org/r/20260924-a9-i2c-v1-0-b8ad9b46f4a8@amlogic.com --- Junyi Zhao (1): i2c: amlogic: Add Amlogic A9 I2C controller driver Xianwei Zhao (1): dt-bindings: i2c: add Amlogic A9 I2C controller .../devicetree/bindings/i2c/amlogic,a9-i2c.yaml | 56 +++ MAINTAINERS | 9 + drivers/i2c/busses/Kconfig | 8 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-amlogic-a9.c | 432 +++++++++++++++++++++ 5 files changed, 506 insertions(+) --- base-commit: 4ec2365c08de306f52650d8736aef5862baedb8d change-id: 20260911-a9-i2c-24478e22e683 Best regards, -- Xianwei Zhao