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authorChristian Lamparter <chunkeey@gmail.com>2018-05-28 14:06:01 +0300
committerLinus Walleij <linus.walleij@linaro.org>2018-06-28 17:28:33 +0300
commitc1e802f68ca057a5ce73ce81eb78dd6f455ff512 (patch)
tree3d9417b1bc1de0432710bce331292291e7a3ab51 /Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt
parent746777012c982c251d4cb173e02494c483ce4a35 (diff)
downloadlinux-c1e802f68ca057a5ce73ce81eb78dd6f455ff512.tar.xz
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 <chunkeey@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt')
-rw-r--r--Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt
index 407b9443629d..6dd72f8599e9 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt
@@ -40,6 +40,14 @@ IPQ8074 platform.
Definition: must be 2. Specifying the pin number and flags, as defined
in <dt-bindings/gpio/gpio.h>
+- gpio-ranges:
+ Usage: required
+ Definition: see ../gpio/gpio.txt
+
+- gpio-reserved-ranges:
+ Usage: optional
+ Definition: see ../gpio/gpio.txt
+
Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
a general description of GPIO and interrupt bindings.
@@ -148,6 +156,7 @@ Example:
interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
gpio-controller;
#gpio-cells = <2>;
+ gpio-ranges = <&tlmm 0 0 70>;
interrupt-controller;
#interrupt-cells = <2>;