[PATCH v2 1/3] dt-bindings: pinctrl: Add a reserved-gpio-ranges property
From: Bjorn Andersson <hidden>
Date: 2018-02-23 16:37:21
Also in:
linux-arm-msm, linux-devicetree, linux-gpio, lkml
On Thu 25 Jan 17:13 PST 2018, Stephen Boyd wrote: + Rob
Some qcom platforms make some GPIOs or pins unavailable for use by non-secure operating systems, and thus reading or writing the registers for those pins will cause access control issues. Introduce a DT property to describe the set of GPIOs that are available for use so that higher level OSes are able to know what pins to avoid reading/writing. Cc: Grant Likely <redacted> Cc: <redacted> Signed-off-by: Stephen Boyd <redacted>
Acked-by: Bjorn Andersson <redacted> Regards, Bjorn
quoted hunk ↗ jump to hunk
--- Documentation/devicetree/bindings/gpio/gpio.txt | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt index b5de08e3b1a2..c22b56680fc8 100644 --- a/Documentation/devicetree/bindings/gpio/gpio.txt +++ b/Documentation/devicetree/bindings/gpio/gpio.txt@@ -151,9 +151,9 @@ in a lot of designs, some using all 32 bits, some using 18 and some using first 18 GPIOs, at local offset 0 .. 17, are in use. If these GPIOs do not happen to be the first N GPIOs at offset 0...N-1, an -additional bitmask is needed to specify which GPIOs are actually in use, -and which are dummies. The bindings for this case has not yet been -specified, but should be specified if/when such hardware appears. +additional set of tuples is needed to specify which GPIOs are unusable, with +the reserved-gpio-ranges binding. This property indicates the start and size +of the GPIOs that can't be used. Optionally, a GPIO controller may have a "gpio-line-names" property. This is an array of strings defining the names of the GPIO lines going out of the@@ -178,6 +178,7 @@ gpio-controller at 00000000 { gpio-controller; #gpio-cells = <2>; ngpios = <18>; + reserved-gpio-ranges = <0 4>, <12 2>; gpio-line-names = "MMC-CD", "MMC-WP", "VDD eth", "RST eth", "LED R", "LED G", "LED B", "Col A", "Col B", "Col C", "Col D", "Row A", "Row B", "Row C", "Row D", "NMI button",-- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project