arm64: dts: imx8mp-kontron: Fix touch reset configuration on DL devices

The reset signal needs a pullup, but there is no hardware pullup.
As a workaround, enable the internal pullup to fix the touchscreen.

As this deviates from the default generic GPIO settings in the OSM
devicetree, add a new node for the touch pinctrl and redefine the
generic gpio1 pinctrl.

Fixes: 946ab10e3f40f ("arm64: dts: Add support for Kontron OSM-S i.MX8MP SoM and BL carrier board")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-kontron-dl.dtso b/arch/arm64/boot/dts/freescale/imx8mp-kontron-dl.dtso
index a3cba41d2b531218c51600c06ce7b4b22b7466ca..7131e9a499ae18e3378d7b25a979d3e4ac5897c5 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mp-kontron-dl.dtso
+++ b/arch/arm64/boot/dts/freescale/imx8mp-kontron-dl.dtso
@@ -77,6 +77,8 @@
        touchscreen@5d {
                compatible = "goodix,gt928";
                reg = <0x5d>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&pinctrl_touch>;
                interrupt-parent = <&gpio1>;
                interrupts = <6 8>;
                irq-gpios = <&gpio1 6 0>;
@@ -98,6 +100,16 @@
        status = "okay";
 };
 
+/* redefine to remove touch controller GPIOs */
+&pinctrl_gpio1 {
+       fsl,pins = <
+               MX8MP_IOMUXC_GPIO1_IO00__GPIO1_IO00             0x19 /* GPIO_A_0 */
+               MX8MP_IOMUXC_GPIO1_IO01__GPIO1_IO01             0x19 /* GPIO_A_1 */
+               MX8MP_IOMUXC_GPIO1_IO05__GPIO1_IO05             0x19 /* GPIO_A_2 */
+               MX8MP_IOMUXC_GPIO1_IO08__GPIO1_IO08             0x19 /* GPIO_A_5 */
+       >;
+};
+
 &pwm1 {
        status = "okay";
 };
@@ -108,4 +120,11 @@
                        MX8MP_IOMUXC_SAI3_RXFS__GPIO4_IO28              0x19
                >;
        };
+
+       pinctrl_touch: touchgrp {
+               fsl,pins = <
+                       MX8MP_IOMUXC_GPIO1_IO06__GPIO1_IO06             0x19
+                       MX8MP_IOMUXC_GPIO1_IO07__GPIO1_IO07             0x150
+               >;
+       };
 };