linux-kernel - Re: [PATCH v6 1/2] dt-bindings: Add binding for Renesas 8T49N241

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Message-ID: <CAMuHMdWZp=7sR+dTL0F8o61weLqqC3k1kkemm_PktvyK8+ONmw@mail.gmail.com>
Date:   Wed, 13 Oct 2021 20:02:49 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Alex Helms <alexander.helms.jy@...esas.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        david.cater.jc@...esas.com, Michal Simek <michal.simek@...inx.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v6 1/2] dt-bindings: Add binding for Renesas 8T49N241

Hi Alex,

On Mon, Sep 13, 2021 at 7:05 PM Alex Helms
<alexander.helms.jy@...esas.com> wrote:
> Renesas 8T49N241 has 4 outputs, 1 integral and 3 fractional dividers.
> The 8T49N241 accepts up to two differential or single-ended input clocks
> and a fundamental-mode crystal input. The internal PLL can lock to either
> of the input reference clocks or to the crystal to behave as a frequency
> synthesizer.
>
> Signed-off-by: Alex Helms <alexander.helms.jy@...esas.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml

> +  reg:
> +    description: I2C device address
> +    enum: [ 0x7c, 0x6c, 0x7d, 0x6d, 0x7e, 0x6e, 0x7f, 0x6f ]

I think this is too strict: according to the datasheet, the full
device address can be customized when ordering.

> +examples:

> +    i2c@0 {
> +        reg = <0x0 0x100>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        renesas8t49n241_2: clock-generator@6c {
> +            compatible = "renesas,8t49n241";
> +            reg = <0x6c>;
> +            #clock-cells = <1>;
> +
> +            clocks = <&xtal>;
> +            clock-names = "xtal";
> +
> +            renesas,settings=[

Missing spaces around equal sign.

> +                09 50 00 60 67 C5 6C FF 03 00 30 00 00 01 00 00

[...]

> +            ];

With the above fixed:
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

BTW, do you plan to add interrupt and/or GPIO support later?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds