linux-kernel - [PATCH v3 2/2] dt-bindings: power: reset: add document for NVMEM based reboot-mode

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Message-ID: <20190421190913.1478-3-nandor.han@vaisala.com>
Date:   Sun, 21 Apr 2019 19:09:30 +0000
From:   Han Nandor <nandor.han@...sala.com>
To:     "sre@...nel.org" <sre@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     Han Nandor <nandor.han@...sala.com>
Subject: [PATCH v3 2/2] dt-bindings: power: reset: add document for NVMEM
 based reboot-mode

Add the device tree bindings document for the NVMEM based reboot-mode
driver.

Signed-off-by: Nandor Han <nandor.han@...sala.com>
---
 .../power/reset/nvmem-reboot-mode.txt         | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/nvmem-reboot-mode.txt

diff --git a/Documentation/devicetree/bindings/power/reset/nvmem-reboot-mode.txt b/Documentation/devicetree/bindings/power/reset/nvmem-reboot-mode.txt
new file mode 100644
index 000000000000..2e1b86c31cb3
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/nvmem-reboot-mode.txt
@@ -0,0 +1,32 @@
+NVMEM reboot mode driver
+
+This driver gets reboot mode magic value from reboot-mode driver
+and stores it in a NVMEM cell named "reboot-mode". 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 "simple-mfd"
+node.
+
+Required properties:
+- compatible: should be "nvmem-reboot-mode".
+- nvmem-cells: A phandle to the reboot mode provided by a nvmem device.
+- nvmem-cell-names: Should be "reboot-mode".
+
+The rest of the properties should follow the generic reboot-mode description
+found in reboot-mode.txt
+
+Example:
+	reboot-mode-nvmem@0 {
+		compatible = "simple-mfd";
+		reboot-mode {
+			compatible = "nvmem-reboot-mode";
+			nvmem-cells = <&reboot_mode>;
+			nvmem-cell-names = "reboot-mode";
+
+			mode-normal     = <0xAAAA5501>;
+			mode-bootloader = <0xBBBB5500>;
+			mode-recovery   = <0xCCCC5502>;
+			mode-test       = <0xDDDD5503>;
+		};
+	};
-- 
2.17.2