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authorChristian Lamparter <chunkeey@gmail.com>2018-05-28 13:06:01 +0200
committerLinus Walleij <linus.walleij@linaro.org>2018-06-28 16:28:33 +0200
commitc1e802f68ca057a5ce73ce81eb78dd6f455ff512 (patch)
tree3d9417b1bc1de0432710bce331292291e7a3ab51 /Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt
parent746777012c982c251d4cb173e02494c483ce4a35 (diff)
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,ipq4019-pinctrl.txt')
-rw-r--r--Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt
index 93374f478b9e..991be0cd0948 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt
@@ -13,6 +13,11 @@ 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.
@@ -64,6 +69,7 @@ Example:
gpio-controller;
#gpio-cells = <2>;
+ gpio-ranges = <&tlmm 0 0 100>;
interrupt-controller;
#interrupt-cells = <2>;
interrupts = <0 208 0>;