linux-kernel - Re: [PATCH v4 3/5] dt-binding: mtd: denali

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Message-ID: <20180622185309.3eef3383@bbrezillon>
Date:   Fri, 22 Jun 2018 18:53:09 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 3/5] dt-binding: mtd: denali_dt: document clock
 property

On Sat, 23 Jun 2018 01:06:36 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> Commit 30f9f2fb7ba0 ("mtd: denali: add a DT driver") supported the
> clock enablement, but did not document it in the DT binding.
> 
> In addition to the existing clock, this commit adds more clocks based
> on the IP specification.
> 
> According to the Denali User's Guide, this IP needs three clocks:
> 
>  - clk: controller core clock
> 
>  - clk_x: bus interface clock
> 
>  - ecc_clk: clock at which ECC circuitry is run
> 
> The driver should accept the current single clock for the backward
> compatibility, but the DT binding should represent the real hardware,
> and future platforms must follow this.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>

> ---
> 
> Changes in v4:
>   - split into a separate patch
> 
> 
>  Documentation/devicetree/bindings/mtd/denali-nand.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt
> index 0ee8edb..f33da87 100644
> --- a/Documentation/devicetree/bindings/mtd/denali-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt
> @@ -8,6 +8,9 @@ Required properties:
>    - reg : should contain registers location and length for data and reg.
>    - reg-names: Should contain the reg names "nand_data" and "denali_reg"
>    - interrupts : The interrupt number.
> +  - clocks: should contain phandle of the controller core clock, the bus
> +    interface clock, and the ECC circuit clock.
> +  - clock-names: should contain "nand", "nand_x", "ecc"
>  
>  Optional properties:
>    - nand-ecc-step-size: see nand.txt for details.  If present, the value must be
> @@ -31,5 +34,7 @@ nand: nand@...00000 {
>  	compatible = "altr,socfpga-denali-nand";
>  	reg = <0xff900000 0x20>, <0xffb80000 0x1000>;
>  	reg-names = "nand_data", "denali_reg";
> +	clocks = <&nand_clk>, <&nand_x_clk>, <&nand_ecc_clk>;
> +	clock-names = "nand", "nand_x", "ecc";
>  	interrupts = <0 144 4>;
>  };