linux-kernel - Re: [PATCH 4/4] net: ethernet: ravb: Name the AVB functional clock fck

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Date:   Mon, 4 Jan 2021 11:41:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Adam Ford <aford173@...il.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] net: ethernet: ravb: Name the AVB functional clock fck

Hi Adam,

On Mon, Dec 28, 2020 at 10:32 PM Adam Ford <aford173@...il.com> wrote:
> The bindings have been updated to support two clocks, but the
> original clock now requires the name fck to distinguish it
> from the other.
>
> Signed-off-by: Adam Ford <aford173@...il.com>

Thanks for your patch!

> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -2142,7 +2142,7 @@ static int ravb_probe(struct platform_device *pdev)
>
>         priv->chip_id = chip_id;
>
> -       priv->clk = devm_clk_get(&pdev->dev, NULL);
> +       priv->clk = devm_clk_get(&pdev->dev, "fck");

This change is not backwards compatible, as existing DTB files do not
have the "fck" clock.  So the driver has to keep on assuming the first
clock is the functional clock, and this patch is thus not needed nor
desired.

>         if (IS_ERR(priv->clk)) {
>                 error = PTR_ERR(priv->clk);
>                 goto out_release;

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