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Wed, 19 Nov 2025 03:53:22 -0800 (PST) From: Encrow Thorne Date: Wed, 19 Nov 2025 19:46:43 +0800 Subject: [PATCH 1/3] dt-bindings: i2c: spacemit: add optional resets Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251119-i2c-k1_reset-support-v1-1-0e9e82bf9b65@gmail.com> References: <20251119-i2c-k1_reset-support-v1-0-0e9e82bf9b65@gmail.com> In-Reply-To: <20251119-i2c-k1_reset-support-v1-0-0e9e82bf9b65@gmail.com> To: Troy Mitchell , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Philipp Zabel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti Cc: Troy Mitchell , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org, Encrow Thorne X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1763553189; l=738; i=jyc0019@gmail.com; s=20251009; h=from:subject:message-id; bh=wFzeQXtiZ3L6svBdjl69noOh9R1d9Ukhuf/3rX8Jnhg=; b=4RO6EP06dVMPaF3EjWiiIGCCWCqY2xaCe3VBWKV7PFNvltdFcuEanM/AKzxhjXnUjU9i+7cb+ 0Qep593NG1tApNtUxjRfBGcXA7WIBA6FeUH/NIA7iZBOR8rTw7y5XBj X-Developer-Key: i=jyc0019@gmail.com; a=ed25519; pk=nnjLv04DUE0FXih6IcJUOjWFTEoo4xYQOu7m5RRHvZ4= Add optional reset property for the SpacemiT K1 I2C. Signed-off-by: Encrow Thorne Acked-by: Troy Mitchell --- Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml b/D= ocumentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml index b7220fff2235..3d4faec41abe 100644 --- a/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml @@ -27,6 +27,9 @@ properties: - description: I2C Functional Clock - description: APB Bus Clock =20 + resets: + maxItems: 1 + clock-names: items: - const: func --=20 2.25.1 From nobody Tue Dec 2 02:18:55 2025 Received: from mail-pl1-f175.google.com (mail-pl1-f175.google.com [209.85.214.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E2A17357A33 for ; Wed, 19 Nov 2025 11:53:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Signed-off-by: Encrow Thorne --- drivers/i2c/busses/i2c-k1.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c index 6b918770e612..64d817d8315d 100644 --- a/drivers/i2c/busses/i2c-k1.c +++ b/drivers/i2c/busses/i2c-k1.c @@ -10,6 +10,7 @@ #include #include #include + #include =20 /* spacemit i2c registers */ #define SPACEMIT_ICR 0x0 /* Control register */ @@ -113,6 +114,7 @@ struct spacemit_i2c_dev { void __iomem *base; int irq; u32 clock_freq; + struct reset_control *resets; =20 struct i2c_msg *msgs; u32 msg_num; @@ -571,6 +573,15 @@ static int spacemit_i2c_probe(struct platform_device *= pdev) if (IS_ERR(clk)) return dev_err_probe(dev, PTR_ERR(clk), "failed to enable bus clock"); =20 + i2c->resets =3D devm_reset_control_get_optional(dev, NULL); + if (IS_ERR(i2c->resets)) + return dev_err_probe(dev, PTR_ERR(i2c->resets), + "failed to get reset\n"); + + reset_control_assert(i2c->resets); + udelay(2); + reset_control_deassert(i2c->resets); 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Wed, 19 Nov 2025 03:56:51 -0800 (PST) From: Encrow Thorne Date: Wed, 19 Nov 2025 19:46:45 +0800 Subject: [PATCH 3/3] riscv: dts: spacemit: add reset property Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251119-i2c-k1_reset-support-v1-3-0e9e82bf9b65@gmail.com> References: <20251119-i2c-k1_reset-support-v1-0-0e9e82bf9b65@gmail.com> In-Reply-To: <20251119-i2c-k1_reset-support-v1-0-0e9e82bf9b65@gmail.com> To: Troy Mitchell , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Philipp Zabel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti Cc: Troy Mitchell , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org, Encrow Thorne X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; 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Signed-off-by: Encrow Thorne --- arch/riscv/boot/dts/spacemit/k1.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spa= cemit/k1.dtsi index af35f9cd6435..2b84dc276ace 100644 --- a/arch/riscv/boot/dts/spacemit/k1.dtsi +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi @@ -468,6 +468,7 @@ i2c2: i2c@d4012000 { <&syscon_apbc CLK_TWSI2_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI2>; interrupts =3D <38>; status =3D "disabled"; }; @@ -481,6 +482,7 @@ i2c8: i2c@d401d800 { <&syscon_apbc CLK_TWSI8_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI8>; interrupts =3D <19>; status =3D "disabled"; }; --=20 2.25.1