linux-kernel - Re: [PATCH 03/10] devicetree: bindings: add bindings for ahci-da850

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Date:   Fri, 13 Jan 2017 13:25:31 -0600
From:   David Lechner <david@...hnology.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Kevin Hilman <khilman@...nel.org>,
        Sekhar Nori <nsekhar@...com>,
        Patrick Titiano <ptitiano@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Tejun Heo <tj@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>
Cc:     linux-ide@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/10] devicetree: bindings: add bindings for ahci-da850

On 01/13/2017 06:37 AM, Bartosz Golaszewski wrote:
> Add DT bindings for the TI DA850 AHCI SATA controller.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  .../devicetree/bindings/ata/ahci-da850.txt          | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ata/ahci-da850.txt
>
> diff --git a/Documentation/devicetree/bindings/ata/ahci-da850.txt b/Documentation/devicetree/bindings/ata/ahci-da850.txt
> new file mode 100644
> index 0000000..d07c241
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/ahci-da850.txt
> @@ -0,0 +1,21 @@
> +Device tree binding for the TI DA850 AHCI SATA Controller
> +---------------------------------------------------------
> +
> +Required properties:
> +  - compatible: must be "ti,da850-ahci"
> +  - reg: physical base addresses and sizes of the controller's register areas
> +  - interrupts: interrupt specifier (refer to the interrupt binding)
> +
> +Optional properties:
> +  - clocks: clock specifier (refer to the common clock binding)
> +  - da850,clk_multiplier: the multiplier for the reference clock needed
> +                          for 1.5GHz PLL output

A clock multiplier property seems redundant if you are specifying a 
clock. It should be possible to get the rate from the clock to determine 
which multiplier is needed.

> +
> +Example:
> +
> +	sata: ahci@...18000 {
> +		compatible = "ti,da850-ahci";
> +		reg = <0x218000 0x2000>, <0x22c018 0x4>;
> +		interrupts = <67>;
> +		da850,clk_multiplier = <7>;
> +	};
>