linux-kernel - [PATCH v2] dt-bindings: display: stm32: add pixel clock mandatory property

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Message-ID: <20180112153034.20353-1-philippe.cornu@st.com>
Date:   Fri, 12 Jan 2018 16:30:34 +0100
From:   Philippe Cornu <philippe.cornu@...com>
To:     Rob Herring <robh+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "Russell King" <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        "Archit Taneja" <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        "Laurent Pinchart" <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Philippe Cornu <philippe.cornu@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Bhumika Goyal <bhumirks@...il.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Yannick Fertre <yannick.fertre@...com>,
        Vincent Abriou <vincent.abriou@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "Maxime Coquelin" <mcoquelin.stm32@...il.com>,
        Gabriel Fernandez <gabriel.fernandez@...com>,
        Ludovic Barre <ludovic.barre@...com>,
        "Fabien Dessenne" <fabien.dessenne@...com>,
        Mickael Reulier <mickael.reulier@...com>
Subject: [PATCH v2] dt-bindings: display: stm32: add pixel clock mandatory property

Add the DPI/RGB input pixel clock in mandatory properties
because it really offers a better preciseness for timing
computations.
Note: Fix also the DSI panel example where "ref" & "pclk"
clocks were swapped.

Signed-off-by: Philippe Cornu <philippe.cornu@...com>
---
Changes in v2: put new clock in last position (Rob Herring)

 Documentation/devicetree/bindings/display/st,stm32-ltdc.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt b/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
index 029252253ad4..942b7237ae87 100644
--- a/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
+++ b/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
@@ -29,6 +29,7 @@ Mandatory properties specific to STM32 DSI:
 - compatible: "st,stm32-dsi".
 - clock-names:
   - phy pll reference clock string name, must be "ref".
+  - DPI/RGB input pixel clock string name, must be "px_clk".
 - resets: see [5].
 - reset-names: see [5].
 
@@ -97,8 +98,9 @@ Example 2: DSI panel
 			#size-cells = <0>;
 			compatible = "st,stm32-dsi";
 			reg = <0x40016c00 0x800>;
-			clocks = <&rcc 1 CLK_F469_DSI>, <&clk_hse>;
-			clock-names = "ref", "pclk";
+			clocks = <&rcc 1 CLK_F469_DSI>, <&clk_hse>,
+				 <&rcc 1 CLK_LCD>;
+			clock-names = "pclk", "ref", "px_clk";
 			resets = <&rcc STM32F4_APB2_RESET(DSI)>;
 			reset-names = "apb";
 
-- 
2.15.1