linux-kernel - [PATCH v1 2/2] arm64: dts: imx8mp-verdin: add single-master property to all i2c nodes

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Message-ID: <20241025095915.22313-3-eichest@gmail.com>
Date: Fri, 25 Oct 2024 11:58:03 +0200
From: Stefan Eichenberger <eichest@...il.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	francesco.dolcini@...adex.com
Cc: devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Stefan Eichenberger <stefan.eichenberger@...adex.com>
Subject: [PATCH v1 2/2] arm64: dts: imx8mp-verdin: add single-master property to all i2c nodes

From: Stefan Eichenberger <stefan.eichenberger@...adex.com>

By default we expect all i2c nodes to be single-master, we do not have
any module or carrier board that uses multi-master mode on any i2c
controller. With this property set, we benefit from optimisations made
exclusively for single-masters.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@...adex.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
index a19ad5ee7f792..323b45bac281e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
@@ -478,6 +478,7 @@ &i2c1 {
 	pinctrl-1 = <&pinctrl_i2c1_gpio>;
 	scl-gpios = <&gpio5 14 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	sda-gpios = <&gpio5 15 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	single-master;
 	status = "okay";
 
 	pca9450: pmic@25 {
@@ -669,6 +670,7 @@ &i2c2 {
 	pinctrl-1 = <&pinctrl_i2c2_gpio>;
 	scl-gpios = <&gpio5 16 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	sda-gpios = <&gpio5 17 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	single-master;
 
 	atmel_mxt_ts_mezzanine: touch-mezzanine@4a {
 		compatible = "atmel,maxtouch";
@@ -690,6 +692,7 @@ &i2c3 {
 	pinctrl-1 = <&pinctrl_i2c3_gpio>;
 	scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	single-master;
 };
 
 /* Verdin I2C_1 */
@@ -700,6 +703,7 @@ &i2c4 {
 	pinctrl-1 = <&pinctrl_i2c4_gpio>;
 	scl-gpios = <&gpio5 20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	sda-gpios = <&gpio5 21 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	single-master;
 
 	gpio_expander_21: gpio-expander@21 {
 		compatible = "nxp,pcal6416";
@@ -788,6 +792,7 @@ &i2c5 {
 	pinctrl-1 = <&pinctrl_i2c5_gpio>;
 	scl-gpios = <&gpio3 26 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	sda-gpios = <&gpio3 27 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	single-master;
 };
 
 /* Verdin PCIE_1 */
-- 
2.43.0