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

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Date:   Tue, 28 Aug 2018 17:44:21 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Leilk Liu <leilk.liu@...iatek.com>, Mark Brown <broonie@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, mengqi.zhang@...iatek.com,
        yt.shen@...iatek.com
Subject: Re: [PATCH 1/3] spis: mediatek: add bindings for Mediatek MT2712 soc
 platform



On 28/08/18 08:28, Leilk Liu wrote:
> This patch adds a DT binding documentation for the MT2712 soc.
> 
> Signed-off-by: Leilk Liu <leilk.liu@...iatek.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

Do I understand correctly that mt6xxx, mt7xxx and mt8xxx SoCs have a totally
different architecture then mt27xx so they will need a totally different
binding. If not, then please rename the binding description file and the driver.

Regards,
Matthias

> 
> 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
> +
> +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.
> +
> +- spi-slave: Empty property indicating the SPI controller is used in slave mode.
> +
> +Example:
> +
> +- SoC Specific Portion:
> +spis: spi@...13000 {
> +	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";
> +};
>