linux-kernel - [PATCH 1/2] regulator: mt6360: Add optional mediatek.power-off-sequence in bindings document

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Message-Id: <1622616875-22740-1-git-send-email-u0084500@gmail.com>
Date:   Wed,  2 Jun 2021 14:54:34 +0800
From:   cy_huang <u0084500@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, matthias.bgg@...il.com,
        robh+dt@...nel.org, gene_chen@...htek.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        cy_huang@...htek.com, gene.chen.richtek@...il.com
Subject: [PATCH 1/2] regulator: mt6360: Add optional mediatek.power-off-sequence in bindings document

From: ChiYuan Huang <cy_huang@...htek.com>

Add optional mediatek.power-off-sequence in bindings document.

Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
Hi,

Originally, we think it must write in platform dependent code like as bootloader.
But after the evaluation, it must write only when system normal HALT or POWER_OFF.
For the other cases, just follow HW immediate off by default.
---
 .../devicetree/bindings/regulator/mt6360-regulator.yaml       | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/mt6360-regulator.yaml b/Documentation/devicetree/bindings/regulator/mt6360-regulator.yaml
index a462d99..eaf36e2 100644
--- a/Documentation/devicetree/bindings/regulator/mt6360-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/mt6360-regulator.yaml
@@ -24,6 +24,16 @@ properties:
   LDO_VIN3-supply:
     description: Input supply phandle(s) for LDO6/7
 
+  mediatek,power-off-sequence:
+    description: |
+      Power off sequence time selection for BUCK1/BUCK2/LDO7/LDO6, respetively.
+      Cause these regulators are all default-on power. Each value from 0 to 63,
+      and step is 1. Each step means 2 millisecond delay.
+      Therefore, the power off sequence delay time range is from 0ms to 126ms.
+    $ref: "/schemas/types.yaml#/definitions/uint8-array"
+    minItems: 4
+    maxItems: 4
+
 patternProperties:
   "^buck[12]$":
     $ref: "regulator.yaml#"
@@ -42,6 +52,7 @@ examples:
     #include <dt-bindings/regulator/mediatek,mt6360-regulator.h>
     regulator {
       compatible = "mediatek,mt6360-regulator";
+      mediatek,power-off-sequence = /bits/ 8 <0 0 0 0>;
       LDO_VIN3-supply = <&BUCK2>;
       buck1 {
         regulator-compatible = "BUCK1";
-- 
2.7.4