linux-kernel - Re: [PATCH 1/3] clk: fix redefinition of clk_prepare on MIPS with HAVE_LEGACY

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Date:   Wed, 25 Nov 2020 15:15:05 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: fix redefinition of clk_prepare on MIPS with
 HAVE_LEGACY_CLK

On Tue, Nov 24, 2020 at 04:11:31PM -0800, Stephen Boyd wrote:
> Quoting Krzysztof Kozlowski (2020-11-17 23:48:12)
> > On Tue, Nov 17, 2020 at 11:41:57PM -0800, Stephen Boyd wrote:
> > > Quoting Krzysztof Kozlowski (2020-11-15 09:09:48)
> > > > COMMON_CLK even though is a user-selectable symbol, is still selected by
> > > > multiple other config options.  COMMON_CLK should not be used when
> > > > legacy clocks are provided by architecture, so it correctly depends on
> > > > !HAVE_LEGACY_CLK.
> > > > 
> > > > However it is possible to create a config which selects both COMMON_CLK
> > > > (by SND_SUN8I_CODEC) and HAVE_LEGACY_CLK (by SOC_RT305X) which leads to
> > > 
> > > Why is SND_SUN8I_CODEC selecting COMMON_CLK? Or really, why is
> > > SOC_RT305X selecting HAVE_LEGACY_CLK?
> > 
> > The SND_SUN8I_CODEC I fixed in following patch (I sent separately v2 of
> > it).
> > 
> > The SOC_RT305X select HAVE_LEGACY_CLK? because it is an old, Ralink
> > platform, not converted to Common clock frm. Few clock operations are
> > defined in: arch/mips/ralink/clk.c
> > 
> 
> Ok so this patch isn't necessary then?

For this particular build failure - it is not necessary anymore.

However there might more of such errors - just not discovered yet. Also,
the clock bulk API has such ifdefs so it kind of symmetrical and
consistent approach.

> It seems OK to select
> HAVE_LEGACY_CLK but not to select COMMON_CLK unless it's architecture
> code that can't be enabled when the other architecture code is selecting
> HAVE_LEGACY_CLK.

Best regards,
Krzysztof