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Thu, 18 Dec 2025 23:42:38 -0800 (PST) From: Encrow Thorne Date: Fri, 19 Dec 2025 15:42:20 +0800 Subject: [PATCH v2 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: <20251219-i2c-reset-v2-1-ad201a602e74@gmail.com> References: <20251219-i2c-reset-v2-0-ad201a602e74@gmail.com> In-Reply-To: <20251219-i2c-reset-v2-0-ad201a602e74@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 , Guodong Xu , 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=1766130147; l=857; i=jyc0019@gmail.com; s=20251009; h=from:subject:message-id; bh=/r6f9IRpVGju3Ryu7UDsRNF+0ADreBgeJr9SFE2YWMw=; b=wvV25q8btJ4G30xXAzQfVKnpzsZrDgyjSlGnmi9bOhuNQ9Aeuh6j0rLJZZ2UdmpI8Wk3BNmIX Bd8J5IqmhlsD4ZMfSltfVzsoWEpZ9saVGE6AaJqKlfN0k6035M6lSH8 X-Developer-Key: i=jyc0019@gmail.com; a=ed25519; pk=nnjLv04DUE0FXih6IcJUOjWFTEoo4xYQOu7m5RRHvZ4= The I2C controller requires a reset to ensure it starts from a clean state. Add the 'resets' property to support this hardware requirement. Signed-off-by: Encrow Thorne Reviewed-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..1290106e28e6 100644 --- a/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml @@ -32,6 +32,9 @@ properties: - const: func - const: bus =20 + resets: + maxItems: 1 + clock-frequency: description: | K1 support three different modes which running different frequencies --=20 2.25.1 From nobody Sun Feb 8 05:42:22 2026 Received: from mail-pf1-f182.google.com (mail-pf1-f182.google.com [209.85.210.182]) (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 7BC4B2C0265 for ; Fri, 19 Dec 2025 07:42:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Thu, 18 Dec 2025 23:42:44 -0800 (PST) Received: from localhost ([221.192.179.86]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7ff7b4234e2sm1512802b3a.27.2025.12.18.23.42.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Dec 2025 23:42:44 -0800 (PST) From: Encrow Thorne Date: Fri, 19 Dec 2025 15:42:21 +0800 Subject: [PATCH v2 2/3] i2c: k1: add reset support 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: <20251219-i2c-reset-v2-2-ad201a602e74@gmail.com> References: <20251219-i2c-reset-v2-0-ad201a602e74@gmail.com> In-Reply-To: <20251219-i2c-reset-v2-0-ad201a602e74@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 , Guodong Xu , 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=1766130147; l=1515; i=jyc0019@gmail.com; s=20251009; h=from:subject:message-id; bh=Ynzt5v58obwnhda42H/gajIJVLz4GWJg6Tg2WmflUX4=; b=qMfQlZSVzRGvXZdg3oEioN5Cn5Xm2J1x59daHMj1raOdC0lTKCnZqnLoQeM/xYyg7eq3aQSEi yhbHPR9x9ooAJ1+wCoS5U5WsMyorqPVeBT+RjAIOxX0vOoHqgDQp5hl X-Developer-Key: i=jyc0019@gmail.com; a=ed25519; pk=nnjLv04DUE0FXih6IcJUOjWFTEoo4xYQOu7m5RRHvZ4= The K1 I2C controller provides a reset line that needs to be deasserted before the controller can be accessed. Add reset support to the driver to ensure the controller starts in the required state. Signed-off-by: Encrow Thorne Reviewed-by: Troy Mitchell --- drivers/i2c/busses/i2c-k1.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c index d42c03ef5db5..23661c7ddb67 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 */ @@ -534,6 +535,7 @@ static int spacemit_i2c_probe(struct platform_device *p= dev) struct device *dev =3D &pdev->dev; struct device_node *of_node =3D pdev->dev.of_node; struct spacemit_i2c_dev *i2c; + struct reset_control *rst; int ret; =20 i2c =3D devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); @@ -578,6 +580,11 @@ 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 + rst =3D devm_reset_control_get_optional_exclusive_deasserted(dev, NULL); + if (IS_ERR(rst)) + return dev_err_probe(dev, PTR_ERR(rst), + "failed to acquire deasserted reset\n"); 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Thu, 18 Dec 2025 23:42:52 -0800 (PST) From: Encrow Thorne Date: Fri, 19 Dec 2025 15:42:22 +0800 Subject: [PATCH v2 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: <20251219-i2c-reset-v2-3-ad201a602e74@gmail.com> References: <20251219-i2c-reset-v2-0-ad201a602e74@gmail.com> In-Reply-To: <20251219-i2c-reset-v2-0-ad201a602e74@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 , Guodong Xu , 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=1766130147; l=2324; i=jyc0019@gmail.com; s=20251009; h=from:subject:message-id; bh=G72T+WZDY27E2UhxRAm4MPRhTxWqCOs6OHY4x2Qdsqw=; b=HD0df5Haj/AFbxGbKco41n1PvKa6CLMqswLAGzmIzGdRjAEs0GfnJLJj92IFCCKm3Vernga+E iBGpVisLTtKBV2nM7Bgx3FZe9xadiIx0GzOForjakC0eN69GVHirVw5 X-Developer-Key: i=jyc0019@gmail.com; a=ed25519; pk=nnjLv04DUE0FXih6IcJUOjWFTEoo4xYQOu7m5RRHvZ4= Add resets property to K1 I2C node. --- arch/riscv/boot/dts/spacemit/k1.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spa= cemit/k1.dtsi index 7818ca4979b6..085987643638 100644 --- a/arch/riscv/boot/dts/spacemit/k1.dtsi +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi @@ -367,6 +367,7 @@ i2c0: i2c@d4010800 { <&syscon_apbc CLK_TWSI0_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI0>; interrupts =3D <36>; status =3D "disabled"; }; @@ -380,6 +381,7 @@ i2c1: i2c@d4011000 { <&syscon_apbc CLK_TWSI1_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI1>; interrupts =3D <37>; status =3D "disabled"; }; @@ -393,6 +395,7 @@ 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"; }; @@ -406,6 +409,7 @@ i2c4: i2c@d4012800 { <&syscon_apbc CLK_TWSI4_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI4>; interrupts =3D <40>; status =3D "disabled"; }; @@ -419,6 +423,7 @@ i2c5: i2c@d4013800 { <&syscon_apbc CLK_TWSI5_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI5>; interrupts =3D <41>; status =3D "disabled"; }; @@ -443,6 +448,7 @@ i2c6: i2c@d4018800 { <&syscon_apbc CLK_TWSI6_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI6>; interrupts =3D <70>; status =3D "disabled"; }; @@ -546,6 +552,7 @@ i2c7: i2c@d401d000 { <&syscon_apbc CLK_TWSI7_BUS>; clock-names =3D "func", "bus"; clock-frequency =3D <400000>; + resets =3D <&syscon_apbc RESET_TWSI7>; interrupts =3D <18>; status =3D "disabled"; }; @@ -559,6 +566,7 @@ 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