2018-01-22 15:39:24

by Philippe Cornu

Subject: [PATCH] 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.

Signed-off-by: Philippe Cornu <[email protected]>
---
Please apply "dt-bindings: display: stm32: correct clock-names
in dsi panel example" before this patch.

Changes in v3: remove the note regarding swapped clock names
(now in a separate patch).
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 3eb1b48b47dd..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 = "pclk", "ref";
+ 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

2018-01-25 16:10:04

by Philippe Cornu

Subject: Re: [PATCH] dt-bindings: display: stm32: add pixel clock mandatory property

Hi,

in short: this patch is "CANCELLED" : )

There is no need to add the pixel clock as a mandatory property because
now the clock value is ajusted in adjusted_mode.

Please have a look to patches:
- drm/stm: ltdc: use crtc_mode_fixup to update adjusted_mode clock
- drm/bridge/synopsys: dsi: use adjusted_mode in mode_set

Hope it is better, comments are welcome

Many thanks,
Philippe :-)

On 01/22/2018 04:38 PM, Philippe Cornu wrote:
> Add the DPI/RGB input pixel clock in mandatory properties
> because it really offers a better preciseness for timing
> computations.
>
> Signed-off-by: Philippe Cornu <[email protected]>
> ---
> Please apply "dt-bindings: display: stm32: correct clock-names
> in dsi panel example" before this patch.
>
> Changes in v3: remove the note regarding swapped clock names
> (now in a separate patch).
> 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 3eb1b48b47dd..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 = "pclk", "ref";
> + 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";
>
>