Re: [RFC PATCH 01/11] dt-bindings: update the binding for Allwinner H3 TVE support

于 2017年5月20日 GMT+08:00 上午2:02:15, Maxime Ripard [off-list ref] 写到:

On Thu, May 18, 2017 at 12:43:44AM +0800, Icenowy Zheng wrote:

quoted

-On SoCs other than the A33 and V3s, there is one more clock

required:

quoted

+For the following compatibles:
+   * allwinner,sun5i-a13-tcon
+   * allwinner,sun6i-a31-tcon
+   * allwinner,sun6i-a31s-tcon
+   * allwinner,sun8i-a33-tcon
+   * allwinner,sun8i-v3s-tcon
+there is one more clock and one more property required:
+ - clocks:
+   - 'tcon-ch0': The clock driving the TCON channel 0
+ - clock-output-names: Name of the pixel clock created
+
+For the following compatibles:
+   * allwinner,sun5i-a13-tcon
+   * allwinner,sun6i-a31-tcon
+   * allwinner,sun6i-a31s-tcon
+   * allwinner,sun8i-h3-tcon0
+there is one more clock required:
    - 'tcon-ch1': The clock driving the TCON channel 1

Putting ID's in the compatible name is usually a bad idea. What is the
difference between the two? Only that the second one doesn't have a
clock?

Yes.

That seems highly unlikely. How does it generate the pixel clock
frequency?

Yes it seems impossible, but it's also the fact.

There's only one CLK_TCON in H3/5, which is for TCON0.

It's possible that lcd-ch1 clk is CLK_TVE, but it's still a weird situation --
Although we have a lcd-ch1 clock, we cannot touch it, otherwise
the TVE will refuse to work (the TVE can only work under 216MHz).

Maxime

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