linux-kernel - Re: [PATCH v2 1/3] clk: meson: add DT documentation for emmc clock controller

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Date:   Wed, 11 Jul 2018 13:43:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yixun Lan <yixun.lan@...ogic.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>, linux-clk@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/3] clk: meson: add DT documentation for emmc clock
 controller

On Tue, Jul 10, 2018 at 04:36:56PM +0000, Yixun Lan wrote:
> Document the MMC sub clock controller driver, the potential consumer
> of this driver is MMC or NAND.

So you all have decided to properly model this now?

> 
> Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
> ---
>  .../bindings/clock/amlogic,mmc-clkc.txt       | 31 +++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
> new file mode 100644
> index 000000000000..ff6b4bf3ecf9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
> @@ -0,0 +1,31 @@
> +* Amlogic MMC Sub Clock Controller Driver
> +
> +The Amlogic MMC clock controller generates and supplies clock to support
> +MMC and NAND controller
> +
> +Required Properties:
> +
> +- compatible: should be:
> +		"amlogic,meson-gx-mmc-clkc"
> +		"amlogic,meson-axg-mmc-clkc"
> +
> +- #clock-cells: should be 1.
> +- clocks: phandles to clocks corresponding to the clock-names property
> +- clock-names: list of parent clock names
> +	- "clkin0", "clkin1"
> +
> +Parent node should have the following properties :
> +- compatible: "syscon", "simple-mfd, and "amlogic,meson-axg-mmc-clkc"

You don't need "simple-mfd" and probably not syscon either. The order is 
wrong too. Most specific first.

> +- reg: base address and size of the MMC control register space.
> +
> +Example: Clock controller node:
> +
> +sd_mmc_c_clkc: clock-controller@...0 {
> +	compatible = "amlogic,mmc-clkc", "syscon", "simple-mfd";

Doesn't match the binding...

> +	reg = <0x0 0x7000 0x0 0x4>;
> +	#clock-cells = <1>;
> +
> +	clock-names = "clkin0", "clkin1";
> +	clocks = <&clkc CLKID_SD_MMC_C_CLK0>,
> +			<&clkc CLKID_FCLK_DIV2>;
> +};
> -- 
> 2.18.0
>