linux-kernel - [PATCH v3 1/2] dt-bindings: arm: atmel: describe SECUMOD usage as a GPIO controller

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Date:   Fri, 7 Dec 2018 06:46:30 +0000
From:   <Andrei.Stefanescu@...rochip.com>
To:     <linus.walleij@...aro.org>, <gregkh@...uxfoundation.org>,
        <Nicolas.Ferre@...rochip.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>
CC:     <Ludovic.Desroches@...rochip.com>, <Cristian.Birsan@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <Andrei.Stefanescu@...rochip.com>
Subject: [PATCH v3 1/2] 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@...rochip.com>
---
 Documentation/devicetree/bindings/arm/atmel-sysregs.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
index 4b96608..c89db84 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@...40000 {
 		compatible = "atmel,sama5d2-secumod", "syscon";
 		reg = <0xfc040000 0x100>;
+		gpio-controller;
+		#gpio-cells = <2>;
 	};
-- 
2.7.4