From c1e802f68ca057a5ce73ce81eb78dd6f455ff512 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Mon, 28 May 2018 13:06:01 +0200 Subject: dt-bindings: pinctrl: qcom: add gpio-ranges, gpio-reserved-ranges This patch adds the gpio-ranges and gpio-reserved-ranges property definitions to the binding text files supported by the pinctrl-msm driver framework. gpio-ranges: For DT-based platforms the pinctrl-msm framework currently relies on the deprecated-for-DT gpiochip_add_pin_range() function to add the range of GPIOs to be handled by the pin controller. Due to interactions within gpiolib code, this causes the pinctrl-msm driver to bail out (-517) during boot when a gpio-hog is declared. This can be fatal and cause the system to not boot or reset (for a detailed explanation and call-trace, refer to patch: "pinctrl: msm: fix gpio-hog related boot issues" in this series). gpio-reserved-ranges: The binding has been added as a precaution since the TrustZone firmware (aka QSEE), which is running as the hypervisor, might have reserved certain, but undisclosed pins. Hence reading or writing to the registers for those pins will cause an XPU violation and this subsequently crashes the kernel. Signed-off-by: Christian Lamparter Reviewed-by: Rob Herring Signed-off-by: Linus Walleij --- Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt') diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt index df9a838ec5f9..cdc4787e59d2 100644 --- a/Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt +++ b/Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt @@ -10,6 +10,11 @@ Required properties: - #gpio-cells : Should be two. The first cell is the gpio pin number and the second cell is used for optional parameters. +- gpio-ranges: see ../gpio/gpio.txt + +Optional properties: + +- gpio-reserved-ranges: see ../gpio/gpio.txt Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for a general description of GPIO and interrupt bindings. @@ -62,6 +67,7 @@ Example: gpio-controller; #gpio-cells = <2>; + gpio-ranges = <&msmgpio 0 0 173>; interrupt-controller; #interrupt-cells = <2>; interrupts = <0 16 0x4>; -- cgit v1.2.3