ARM: dts: Add strict_gpiod dtparam

Setting strict_gpiod disables the GPIO output persistence, such that
pins are returned to being inputs when they are released. Note that
this applies to the GPIO/pinctrl driver for the user-facing GPIOs,
not the SoC GPIOs on Pi 5.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

arch/arm/boot/dts/broadcom/bcm270x-rpi.dtsi

@@ -97,6 +97,8 @@
 		drm_fb0_vc4 = <&aliases>, "drm-fb0=",&vc4;
 		drm_fb1_vc4 = <&aliases>, "drm-fb1=",&vc4;
 		drm_fb2_vc4 = <&aliases>, "drm-fb2=",&vc4;
+
+		strict_gpiod = <&chosen>, "bootargs=pinctrl_bcm2835.strict_gpiod=y";
 	};
 };
 

arch/arm/boot/dts/broadcom/bcm2712-rpi.dtsi

@@ -99,6 +99,7 @@
 		nvmem_cust_rw = <&nvmem_cust>,"rw?";
 		nvmem_priv_rw = <&nvmem_priv>,"rw?";
 		nvmem_mac_rw = <&nvmem_mac>,"rw?";
+		strict_gpiod = <&chosen>, "bootargs=pinctrl_rp1.strict_gpiod=y";
 	};
 };