On Fri, Nov 23, 2018 at 09:10:09AM +0000, Anson Huang wrote:
> The i.MX GPT timer driver binding doc is out of date,
> the "interrupts", "clocks" and "clock-names" do NOT match
> current GPT driver implementation, update it and use i.MX6SX
> as example.
>
> Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> ---
> .../devicetree/bindings/timer/fsl,imxgpt.txt | 22 +++++++++++++---------
> 1 file changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
> index 9809b11..4e9fa16 100644
> --- a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
> +++ b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
> @@ -2,17 +2,21 @@ Freescale i.MX General Purpose Timer (GPT)
>
> Required properties:
>
> -- compatible : should be "fsl,<soc>-gpt"
> -- reg : Specifies base physical address and size of the registers.
> -- interrupts : A list of 4 interrupts; one per timer channel.
> -- clocks : The clocks provided by the SoC to drive the timer.
> +- compatible : should be "fsl,<soc>-gpt".
This should enumerate valid <soc> values.
> +- reg : specifies base physical address and size of the registers.
> +- interrupts : should be the clock event device interrupt.
> +- clocks : the clocks provided by the SoC to drive the timer, must contain
> + an entry for each entry in clock-names.
> +- clock-names : must include an "per" or "osc_per" entry, and "ipg" entry
> + is optional according to SoC design.
Need to define the order. Ideally the optional clock should be last, but
that's not what the example has.
>
> Example:
>
> -gpt1: timer@10003000 {
> - compatible = "fsl,imx27-gpt", "fsl,imx1-gpt";
> - reg = <0x10003000 0x1000>;
> - interrupts = <26>;
> - clocks = <&clks 46>, <&clks 61>;
> +gpt: gpt@2098000 {
timer@...
> + compatible = "fsl,imx6sx-gpt", "fsl,imx31-gpt";
You haven't documented "fsl,imx31-gpt" is a valid fallback. Is the old
example not still valid for imx27?
> + reg = <0x02098000 0x4000>;
Using a size > 4KB just wastes virtual space which is valuable on 32-bit
systems with >= 1GB RAM.
> + interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&clks IMX6SX_CLK_GPT_BUS>,
> + <&clks IMX6SX_CLK_GPT_3M>;
> clock-names = "ipg", "per";
> };
> --
> 2.7.4
>
