diff options
| author |   Andrei.Stefanescu@microchip.com <Andrei.Stefanescu@microchip.com> | 2018-12-12 11:57:11 +0000 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2018-12-21 10:54:33 +0100 |
| commit | 6bd925a8b779b262b007d638171c80398cfbc217 (patch) | |
| tree | 229f048462089fdf8f14cc67d36261a16596c551 | |
| parent | gpio/mmc/of: Respect polarity in the device tree (diff) | |
| download | linux-dev-6bd925a8b779b262b007d638171c80398cfbc217.tar.xz linux-dev-6bd925a8b779b262b007d638171c80398cfbc217.zip | |
dt-bindings: arm: atmel: describe SECUMOD usage as a GPIO controller
This patch describes the Security Module's usage as a GPIO
controller for its PIOBU pins. These pins have the special
property of maintaining their voltage during suspend-to-mem.
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | Documentation/devicetree/bindings/arm/atmel-sysregs.txt | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt index 4b96608ad692..14f319f694b7 100644 --- a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt +++ b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt @@ -158,14 +158,24 @@ Security Module (SECUMOD) The Security Module macrocell provides all necessary secure functions to avoid voltage, temperature, frequency and mechanical attacks on the chip. It also -embeds secure memories that can be scrambled +embeds secure memories that can be scrambled. + +The Security Module also offers the PIOBU pins which can be used as GPIO pins. +Note that they maintain their voltage during Backup/Self-refresh. required properties: - compatible: Should be "atmel,<chip>-secumod", "syscon". <chip> can be "sama5d2". - reg: Should contain registers location and length +- gpio-controller: Marks the port as GPIO controller. +- #gpio-cells: There are 2. The pin number is the + first, the second represents additional + parameters such as GPIO_ACTIVE_HIGH/LOW. + secumod@fc040000 { compatible = "atmel,sama5d2-secumod", "syscon"; reg = <0xfc040000 0x100>; + gpio-controller; + #gpio-cells = <2>; }; |