linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: <Andrei.Stefanescu@microchip.com>
To: <linus.walleij@linaro.org>, <robh+dt@kernel.org>,
	<gregkh@linuxfoundation.org>, <Nicolas.Ferre@microchip.com>,
	<mark.rutland@arm.com>
Cc: <Ludovic.Desroches@microchip.com>,
	<Cristian.Birsan@microchip.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-gpio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <Andrei.Stefanescu@microchip.com>
Subject: [PATCH v4 1/2] dt-bindings: arm: atmel: describe SECUMOD usage as a GPIO controller
Date: Wed, 12 Dec 2018 11:57:11 +0000	[thread overview]
Message-ID: <1544615784-29331-2-git-send-email-andrei.stefanescu@microchip.com> (raw)
In-Reply-To: <1544615784-29331-1-git-send-email-andrei.stefanescu@microchip.com>

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>
---
 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@fc040000 {
 		compatible = "atmel,sama5d2-secumod", "syscon";
 		reg = <0xfc040000 0x100>;
+		gpio-controller;
+		#gpio-cells = <2>;
 	};
-- 
2.7.4


  reply	other threads:[~2018-12-12 11:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-12 11:56 [PATCH v4 0/2] add SAMA5D2 PIOBU GPIO driver Andrei.Stefanescu
2018-12-12 11:57 ` Andrei.Stefanescu [this message]
2018-12-17 21:47   ` [PATCH v4 1/2] dt-bindings: arm: atmel: describe SECUMOD usage as a GPIO controller Rob Herring
2018-12-21  9:55   ` Linus Walleij
2018-12-12 11:57 ` [PATCH v4 2/2] gpio: add driver for SAMA5D2 PIOBU pins Andrei.Stefanescu
2018-12-21  9:57   ` Linus Walleij

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1544615784-29331-2-git-send-email-andrei.stefanescu@microchip.com \
    --to=andrei.stefanescu@microchip.com \
    --cc=Cristian.Birsan@microchip.com \
    --cc=Ludovic.Desroches@microchip.com \
    --cc=Nicolas.Ferre@microchip.com \
    --cc=devicetree@vger.kernel.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=linus.walleij@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-gpio@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=robh+dt@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).