linux-kernel - [PATCH V8 7/7] dt-bindings: bridge: samsung-dsim: Make some flags optional

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Message-Id: <20230526030559.326566-8-aford173@gmail.com>
Date:   Thu, 25 May 2023 22:05:59 -0500
From:   Adam Ford <aford173@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Inki Dae <inki.dae@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V8 7/7] dt-bindings: bridge: samsung-dsim: Make some flags optional

In the event a device is connected to the samsung-dsim
controller that doesn't support the burst-clock, the
driver is able to get the requested pixel clock from the
attached device or bridge.  In these instances, the
samsung,burst-clock-frequency isn't needed, so remove
it from the required list.

The pll-clock frequency can be set by the device tree entry
for samsung,pll-clock-frequency, but in some cases, the
pll-clock may have the same clock rate as sclk_mipi clock.
If they are equal, this flag is not needed since the driver
will use the sclk_mipi rate as a fallback.

Signed-off-by: Adam Ford <aford173@...il.com>
---
 .../bindings/display/bridge/samsung,mipi-dsim.yaml       | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml b/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
index 9f61ebdfefa8..360fea81f4b6 100644
--- a/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
@@ -70,7 +70,9 @@ properties:
   samsung,burst-clock-frequency:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-      DSIM high speed burst mode frequency.
+      DSIM high speed burst mode frequency when connected to devices
+      that support burst mode. If absent, the driver will use the pixel
+      clock from the attached device or bridge.
 
   samsung,esc-clock-frequency:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -80,7 +82,8 @@ properties:
   samsung,pll-clock-frequency:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-      DSIM oscillator clock frequency.
+      DSIM oscillator clock frequency. If absent, the driver will
+      use the clock frequency of sclk_mipi.
 
   phys:
     maxItems: 1
@@ -134,9 +137,7 @@ required:
   - compatible
   - interrupts
   - reg
-  - samsung,burst-clock-frequency
   - samsung,esc-clock-frequency
-  - samsung,pll-clock-frequency
 
 allOf:
   - $ref: ../dsi-controller.yaml#
-- 
2.39.2