linux-kernel - [PATCH v3 02/13] ARM: dts: imx6ull-colibri: change touch i2c parameters

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Message-Id: <20220506132416.273965-3-marcel@ziswiler.com>
Date:   Fri,  6 May 2022 15:24:05 +0200
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Max Krummenacher <max.krummenacher@...adex.com>,
        Denys Drozdov <denys.drozdov@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 02/13] ARM: dts: imx6ull-colibri: change touch i2c parameters

From: Max Krummenacher <max.krummenacher@...adex.com>

Switch on 22 kOhm pull-ups and lower the I2C frequency to around 40 kHz
to get more reliable communication.

Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>
Signed-off-by: Denys Drozdov <denys.drozdov@...adex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
---

(no changes since v1)

 arch/arm/boot/dts/imx6ull-colibri.dtsi | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/imx6ull-colibri.dtsi b/arch/arm/boot/dts/imx6ull-colibri.dtsi
index 84bb7574d211..dc947035495b 100644
--- a/arch/arm/boot/dts/imx6ull-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6ull-colibri.dtsi
@@ -114,6 +114,8 @@ &i2c1 {
 };
 
 &i2c2 {
+	/* Use low frequency to compensate for the high pull-up values. */
+	clock-frequency = <40000>;
 	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c2>;
 	pinctrl-1 = <&pinctrl_i2c2_gpio>;
@@ -405,15 +407,15 @@ MX6UL_PAD_UART4_RX_DATA__GPIO1_IO29 0x4001b8b0	/* SODIMM 194 */
 
 	pinctrl_i2c2: i2c2-grp {
 		fsl,pins = <
-			MX6UL_PAD_UART5_TX_DATA__I2C2_SCL 0x4001b8b0
-			MX6UL_PAD_UART5_RX_DATA__I2C2_SDA 0x4001b8b0
+			MX6UL_PAD_UART5_TX_DATA__I2C2_SCL 0x4001f8b0
+			MX6UL_PAD_UART5_RX_DATA__I2C2_SDA 0x4001f8b0
 		>;
 	};
 
 	pinctrl_i2c2_gpio: i2c2-gpio-grp {
 		fsl,pins = <
-			MX6UL_PAD_UART5_TX_DATA__GPIO1_IO30 0x4001b8b0
-			MX6UL_PAD_UART5_RX_DATA__GPIO1_IO31 0x4001b8b0
+			MX6UL_PAD_UART5_TX_DATA__GPIO1_IO30 0x4001f8b0
+			MX6UL_PAD_UART5_RX_DATA__GPIO1_IO31 0x4001f8b0
 		>;
 	};
 
-- 
2.35.1