linux-kernel - [PATCH v1 4/4] dt-binding: power: reset: Add documentation for MTK RGU (Reset Gernation Unit) reboot driver

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Date:   Tue, 26 Nov 2019 13:34:50 +0800
From:   <freddy.hsin@...iatek.com>
To:     <sre@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wim@...ux-watchdog.org>,
        <linux@...ck-us.net>, <matthias.bgg@...il.com>,
        <linux-watchdog@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <devicetree@...r.kernel.org>
CC:     <Chang-An.Chen@...iatek.com>, <wsd_upstream@...iatek.com>,
        Freddy Hsin <freddy.hsin@...iatek.com>
Subject: [PATCH v1 4/4] dt-binding: power: reset: Add documentation for MTK RGU (Reset Gernation Unit) reboot driver

From: Freddy Hsin <freddy.hsin@...iatek.com>

Add documentation for MTK RGU (Reset Generation Unit) reboot driver.

Signed-off-by: Freddy Hsin <freddy.hsin@...iatek.com>
---
 .../devicetree/bindings/power/reset/mtk-reboot.txt |   30 ++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/mtk-reboot.txt

diff --git a/Documentation/devicetree/bindings/power/reset/mtk-reboot.txt b/Documentation/devicetree/bindings/power/reset/mtk-reboot.txt
new file mode 100644
index 0000000..708d351
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/mtk-reboot.txt
@@ -0,0 +1,30 @@
+Generic MTK RGU mapped register reset driver
+
+This is a reset driver using toprgu to map its non-volatile register.
+The reset is generally performed with a write to the non-volatile register
+defined by the register map pointed by toprgu reference plus the offset
+with the mask defined in the reboot-mode node.
+
+Required properties:
+- compatible: should contain "toprgu-reboot-mode"
+- regmap: this is phandle to the register map node
+- offset: offset in the register map for the reboot-mode register (in bytes)
+- mask: the reset value written to the reboot register (32 bit access)
+
+Examples:
+	reboot-mode {
+	   compatible = "toprgu-reboot-mode";
+	   regmap = <&toprgu>;
+	   offset = <0x24>;
+	   mask = <0xF>;
+	};
+
+Optional properties - reboot mode value that will keep in toprgu nonrst RG:
+- mode-charger = <BOOT_CHARGER>;
+- mode-recovery = <BOOT_RECOVERY>;
+- mode-bootloader = <BOOT_BOOTLOADER>;
+- mode-dm-verity-dev-corrupt = <BOOT_DM_VERITY>;
+- mode-kpoc = <BOOT_KPOC>;
+- mode-ddr-reserve = <BOOT_DDR_RSVD>;
+- mode-meta = <BOOT_META>;
+- mode-rpmbpk = <BOOT_RPMBPK>;
-- 
1.7.9.5