linux-kernel - [PATCH] dt-bindings: display: use spi-peripheral-props.yaml

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Date:   Wed, 27 Jul 2022 18:43:12 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        David Lechner <david@...hnology.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Heiko Schocher <hs@...x.de>,
        Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH] dt-bindings: display: use spi-peripheral-props.yaml

Instead of listing directly properties typical for SPI peripherals,
reference the spi-peripheral-props.yaml schema.  This allows using all
properties typical for SPI-connected devices, even these which device
bindings author did not tried yet.

Remove the spi-* properties which now come via spi-peripheral-props.yaml
schema, except for the cases when device schema adds some constraints
like maximum frequency.

While changing additionalProperties->unevaluatedProperties, put it in
typical place, just before example DTS.

The sitronix,st7735r references also panel-common.yaml and lists
explicitly allowed properties, thus here reference only
spi-peripheral-props.yaml for purpose of documenting the SPI slave
device and bringing spi-max-frequency type validation.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Technically, this depends on [1] merged to SPI tree, if we want to
preserve existing behavior of not allowing SPI CPHA and CPOL in each of
schemas in this patch.

If this patch comes independently via different tree, the SPI CPHA and
CPOL will be allowed for brief period of time, before [1] is merged.
This will not have negative impact, just DT schema checks will be
loosened for that period.

[1] https://lore.kernel.org/all/20220722191539.90641-2-krzysztof.kozlowski@linaro.org/
---
 .../devicetree/bindings/display/panel/lg,lg4573.yaml       | 2 +-
 .../devicetree/bindings/display/sitronix,st7735r.yaml      | 1 +
 .../devicetree/bindings/display/solomon,ssd1307fb.yaml     | 7 +++----
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/panel/lg,lg4573.yaml b/Documentation/devicetree/bindings/display/panel/lg,lg4573.yaml
index b4314ce7b411..ee357e139ac0 100644
--- a/Documentation/devicetree/bindings/display/panel/lg,lg4573.yaml
+++ b/Documentation/devicetree/bindings/display/panel/lg,lg4573.yaml
@@ -15,13 +15,13 @@ maintainers:
 
 allOf:
   - $ref: panel-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
 properties:
   compatible:
     const: lg,lg4573
 
   reg: true
-  spi-max-frequency: true
 
 required:
   - compatible
diff --git a/Documentation/devicetree/bindings/display/sitronix,st7735r.yaml b/Documentation/devicetree/bindings/display/sitronix,st7735r.yaml
index 157b1a7b18f9..53f181ef3670 100644
--- a/Documentation/devicetree/bindings/display/sitronix,st7735r.yaml
+++ b/Documentation/devicetree/bindings/display/sitronix,st7735r.yaml
@@ -15,6 +15,7 @@ description:
 
 allOf:
   - $ref: panel/panel-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
 properties:
   compatible:
diff --git a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
index 3fbd87c2c120..669f70b1b4c4 100644
--- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
+++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
@@ -49,9 +49,6 @@ properties:
   vbat-supply:
     description: The supply for VBAT
 
-  # Only required for SPI
-  spi-max-frequency: true
-
   solomon,height:
     $ref: /schemas/types.yaml#/definitions/uint32
     default: 16
@@ -153,6 +150,8 @@ required:
   - reg
 
 allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
   - if:
       properties:
         compatible:
@@ -223,7 +222,7 @@ allOf:
         solomon,dclk-frq:
           default: 10
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
-- 
2.34.1