Re: [PATCH 1/3] spis: mediatek: add bindings for Mediatek MT2712 soc platform

[Rob Herring <robh@kernel.org>]

On Tue, Aug 28, 2018 at 02:28:03PM +0800, Leilk Liu wrote:
> This patch adds a DT binding documentation for the MT2712 soc.
> 
> Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
> ---
>  .../devicetree/bindings/spi/spi-slave-mt27xx.txt   |   39 ++++++++++++++++++++
>  1 file changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/spi-slave-mt27xx.txt
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi-slave-mt27xx.txt b/Documentation/devicetree/bindings/spi/spi-slave-mt27xx.txt
> new file mode 100644
> index 0000000..dcb8934
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/spi-slave-mt27xx.txt
> @@ -0,0 +1,39 @@
> +Binding for MTK SPI Slave controller

Only does slave mode? If not, then the file name and doc should be just 
for the SPI controller (master and slave). The "spi-slave" property 
selects the mode. If it is only slave mode, then you don't need the 
spi-slave property.


> +
> +Required properties:
> +- compatible: should be one of the following.
> +    - mediatek,mt2712-spi: for mt2712 platforms
> +
> +- reg: Address and length of the register set for the device
> +
> +- interrupts: Should contain spi interrupt
> +
> +- clocks: phandles to input clocks.
> +  The first should be one of the following. It's PLL.
> +   -  <&topckgen CLK_TOP_UNIVPLL1_D2>: specify parent clock 312MHZ.
> +				      It's the default one.
> +   -  <&topckgen CLK_TOP_UNIVPLL1_D4>: specify parent clock 156MHZ.
> +   -  <&topckgen CLK_TOP_UNIVPLL2_D4>: specify parent clock 104MHZ.
> +   -  <&topckgen CLK_TOP_UNIVPLL1_D8>: specify parent clock 78MHZ.
> +  The second should be <&topckgen CLK_TOP_SPISLV_SEL>. It's clock mux.
> +  The third is <&infracfg CLK_INFRA_AO_SPI1>. It's clock gate.
> +
> +- clock-names: shall be "parent-clk" for the parent clock, "sel-clk" for the
> +  muxes clock, and "spi-clk" for the clock gate.

"-clk" is redundant.

Is the parent clock actually connected to the block? The assigned-clocks 
properties are used for constraints on parent clocks.

> +
> +- spi-slave: Empty property indicating the SPI controller is used in slave mode.
> +
> +Example:
> +
> +- SoC Specific Portion:
> +spis: spi@10013000 {
> +	compatible = "mediatek,mt2712-spi-slave";
> +	reg = <0 0x10013000 0 0x100>;
> +	interrupts = <GIC_SPI 283 IRQ_TYPE_LEVEL_LOW>;
> +	clocks = <&topckgen CLK_TOP_UNIVPLL1_D2>,
> +		<&topckgen CLK_TOP_SPISLV_SEL>,
> +		<&infracfg CLK_INFRA_AO_SPI1>;
> +	clock-names = "parent-clk", "sel-clk", "spi-clk";
> +	spi-slave;
> +	status = "disabled";

Don't should status in examples.

> +};
> -- 
> 1.7.9.5
>