linux-kernel - Re: [V2 1/2] clk: imx6q: remove unsupported pll4_audio

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Message-ID: <155232933665.20095.16726298881697876719@swboyd.mtv.corp.google.com>
Date:   Mon, 11 Mar 2019 11:35:36 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Eric Nelson <eric@...int.com>, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Cc:     anson.huang@....com, colin.didier@...ialet.com, festevam@...il.com,
        kernel@...gutronix.de, l.stach@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        mturquette@...libre.com, robh+dt@...nel.org,
        s.hauer@...gutronix.de, shawnguo@...nel.org, tiny.windzz@...il.com,
        Eric Nelson <eric@...int.com>
Subject: Re: [V2 1/2] clk: imx6q: remove unsupported pll4_audio_div

Quoting Eric Nelson (2019-03-11 08:59:56)
> diff --git a/include/dt-bindings/clock/imx6qdl-clock.h b/include/dt-bindings/clock/imx6qdl-clock.h
> index b3cef29..34bb14d 100644
> --- a/include/dt-bindings/clock/imx6qdl-clock.h
> +++ b/include/dt-bindings/clock/imx6qdl-clock.h
> @@ -213,7 +213,15 @@
>  #define IMX6QDL_CLK_CKO2                       200
>  #define IMX6QDL_CLK_CKO                                201
>  #define IMX6QDL_CLK_VDOA                       202
> -#define IMX6QDL_CLK_PLL4_AUDIO_DIV             203
> +
> +/* The PLL4_AUDIO_DIV divider only appeared in
> + * early versions of the reference manual.
> + *
> + * Renamed to _BROKEN to prevent inadvertent use,
> + * but reserved the array slot to maintain DT binary
> + * compatibility.
> + */
> +#define IMX6QDL_CLK_PLL4_AUDIO_DIV_BROKEN      203

But it breaks the build. I don't get it. Just add a comment indicating
it shouldn't be used? That breaks the cross-tree dependency chain and
lets clk tree merge the clk driver part and arm-soc merge the dts part.