linux-kernel - [RFC][PATCH 2/4] dt-bindings: power: reset: Add document for sram-reboot-mode driver

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Message-Id: <1470265523-27557-3-git-send-email-john.stultz@linaro.org>
Date:	Wed,  3 Aug 2016 16:05:21 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Andy Yan <andy.yan@...k-chips.com>,
	Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Thierry Reding <treding@...dia.com>,
	Heiko Stübner <heiko@...ech.de>,
	Caesar Wang <wxt@...k-chips.com>,
	Kees Cook <keescook@...omium.org>,
	Guodong Xu <guodong.xu@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Vishal Bhoj <vishal.bhoj@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	devicetree@...r.kernel.org,
	Android Kernel Team <kernel-team@...roid.com>
Subject: [RFC][PATCH 2/4] dt-bindings: power: reset: Add document for sram-reboot-mode driver

Add device tree binding document for reboot-mode driver

Cc: Andy Yan <andy.yan@...k-chips.com>
Cc: Rob Herring <robh@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Thierry Reding <treding@...dia.com>
Cc: Heiko Stübner <heiko@...ech.de>
Cc: Caesar Wang <wxt@...k-chips.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Guodong Xu <guodong.xu@...aro.org>
Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
Cc: Vishal Bhoj <vishal.bhoj@...aro.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: devicetree@...r.kernel.org
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 .../bindings/power/reset/sram-reboot-mode.txt      | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/sram-reboot-mode.txt

diff --git a/Documentation/devicetree/bindings/power/reset/sram-reboot-mode.txt b/Documentation/devicetree/bindings/power/reset/sram-reboot-mode.txt
new file mode 100644
index 0000000..0a0ed05
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/sram-reboot-mode.txt
@@ -0,0 +1,35 @@
+SRAM reboot mode driver
+
+This driver get reboot mode magic value form reboot-mode driver
+and stores it in a SRAM address. Then the bootloader
+can read it and take different action according to the magic
+value stored.
+
+This DT node should be represented as a sub-node of a "mmio-sram" node.
+
+Required properties:
+- compatible: should be "sram-reboot-mode"
+- reg: offset from the sram range where to store the magic value(in bytes)
+
+The rest of the properties should follow the generic reboot-mode discription
+found in reboot-mode.txt
+
+Example:
+
+	sram@...1000 {
+		compatible = "mmio-sram";
+		reg = <0x0 0x05f01000 0x0 0x00001000>;
+		ranges = <0x0 0x0 0x05f01000 0x00001000>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		reboot-mode@0 {
+			compatible = "sram-reboot-mode";
+			reg = <0x0 0x4>;
+
+			mode-normal     = <0x77665501>;
+			mode-bootloader = <0x77665500>;
+			mode-recovery   = <0x77665502>;
+		};
+	};
-- 
1.9.1