Re: [PATCH v2 1/2] dt-bindings: pinctrl: mt8192: Switch drive-strength-adv for -microamp

[Guodong Liu <guodong.liu@xxxxxxxxxxxx>]

-----Original Message-----
From: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
To: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx
>, kernel@xxxxxxxxxxxxx, Nícolas F. R. A. Prado <
nfraprado@xxxxxxxxxxxxx>, Krzysztof Kozlowski <
krzysztof.kozlowski+dt@xxxxxxxxxx>, Matthias Brugger <
matthias.bgg@xxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Sean Wang <
sean.wang@xxxxxxxxxxxx>, devicetree@xxxxxxxxxxxxxxx, 
linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-gpio@xxxxxxxxxxxxxxx, 
linux-kernel@xxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx
Subject: [PATCH v2 1/2] dt-bindings: pinctrl: mt8192: Switch drive-
strength-adv for -microamp
Date: Tue, 31 May 2022 18:19:53 -0400

Commit e5fabbe43f3f ("pinctrl: mediatek: paris: Support generic
PIN_CONFIG_DRIVE_STRENGTH_UA") added support for using
drive-strength-microamp instead of mediatek,drive-strength-adv.

Since there aren't any users of mediatek,drive-strength-adv on mt8192
yet, remove this property and add drive-strength-microamp in its place,
which has a clearer meaning.

While at it, add a new 'if' block to validate that drive-strength and
drive-strength-microamp aren't used together, since they're mutually
exclusive.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <
angelogiocchino.delregno@xxxxxxxxxxxxx>
---

Changes in v2:
- Added 'if' block to make drive-strength and drive-strength-microamp
  mutually exclusive
- Changed commit title to be more precise
- Dropped Fixes tag

 .../bindings/pinctrl/pinctrl-mt8192.yaml      | 35 ++++++-------------
 1 file changed, 10 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-
mt8192.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-
mt8192.yaml
index c90a132fbc79..c8092b218f2f 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml
@@ -80,31 +80,8 @@ patternProperties:
               dt-bindings/pinctrl/mt65xx.h. It can only support
2/4/6/8/10/12/14/16mA in mt8192.
             enum: [2, 4, 6, 8, 10, 12, 14, 16]
 
-          mediatek,drive-strength-adv:
-            description: |
-              Describe the specific driving setup property.
-              For I2C pins, the existing generic driving setup can
only support
-              2/4/6/8/10/12/14/16mA driving. But in specific driving
setup, they
-              can support 0.125/0.25/0.5/1mA adjustment. If we enable
specific
-              driving setup, the existing generic setup will be
disabled.
-              The specific driving setup is controlled by E1E0EN.
-              When E1=0/E0=0, the strength is 0.125mA.
-              When E1=0/E0=1, the strength is 0.25mA.
-              When E1=1/E0=0, the strength is 0.5mA.
-              When E1=1/E0=1, the strength is 1mA.
-              EN is used to enable or disable the specific driving
setup.
-              Valid arguments are described as below:
-              0: (E1, E0, EN) = (0, 0, 0)
-              1: (E1, E0, EN) = (0, 0, 1)
-              2: (E1, E0, EN) = (0, 1, 0)
-              3: (E1, E0, EN) = (0, 1, 1)
-              4: (E1, E0, EN) = (1, 0, 0)
-              5: (E1, E0, EN) = (1, 0, 1)
-              6: (E1, E0, EN) = (1, 1, 0)
-              7: (E1, E0, EN) = (1, 1, 1)
-              So the valid arguments are from 0 to 7.
-            $ref: /schemas/types.yaml#/definitions/uint32
-            enum: [0, 1, 2, 3, 4, 5, 6, 7]

Can't remove mediatek,drive-strength-adv property, I2C pins will ofter
use this property

+          drive-strength-microamp:
+            enum: [125, 250, 500, 1000]
 
           mediatek,pull-up-adv:
             description: |
@@ -138,6 +115,14 @@ patternProperties:
         required:
           - pinmux
 
+        allOf:
+          - if:
+              required:
+                - drive-strength-microamp
+            then:
+              properties:
+                drive-strength: false
+
         additionalProperties: false
 
Property drive-strength-microamp and drive-strength aren't exclusive,
just i2c pins support drive-strength-microamp property .

 allOf: