linux-kernel - Re: [PATCH] MIPS: ralink: define stubs for clk_set

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Date:   Wed, 17 Mar 2021 20:59:47 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        John Crispin <john@...ozen.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        thierry.reding@...il.com, linux-tegra@...r.kernel.org,
        balbi@...nel.org, linux-usb@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] MIPS: ralink: define stubs for clk_set_parent to fix
 compile testing

On Wed, 17 Mar 2021 at 20:37, Dmitry Osipenko <digetx@...il.com> wrote:
>
> 17.03.2021 12:56, Krzysztof Kozlowski пишет:
> > On 17/03/2021 10:52, Sergei Shtylyov wrote:
> >> Hello!
> >>
> >> On 16.03.2021 20:57, Krzysztof Kozlowski wrote:
> >>
> >>> The Ralink MIPS platform does not use Common Clock Framework and does
> >>> not define certain clock operations leading to compile test failures:
> >>>
> >>>      /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
> >>>      phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'
> >>>
> >>> Reported-by: kernel test robot <lkp@...el.com>
> >>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> >>> ---
> >>>   arch/mips/ralink/clk.c | 14 ++++++++++++++
> >>>   1 file changed, 14 insertions(+)
> >>>
> >>> diff --git a/arch/mips/ralink/clk.c b/arch/mips/ralink/clk.c
> >>> index 2f9d5acb38ea..8387177a47ef 100644
> >>> --- a/arch/mips/ralink/clk.c
> >>> +++ b/arch/mips/ralink/clk.c
> >>> @@ -70,6 +70,20 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
> >>>   }
> >>>   EXPORT_SYMBOL_GPL(clk_round_rate);
> >>>
> >>> +int clk_set_parent(struct clk *clk, struct clk *parent)
> >>> +{
> >>> +   WARN_ON(clk);
> >>> +   return -1;
> >>
> >>     Shouldn't this be a proepr error code (-1 corresponds to -EPRERM)?
> >
> > Could be ENODEV or EINVAL but all other stubs here and in ar7/clock.c
> > use -1. Do you prefer it then to have it inconsistent with others?
>
> I don't see where -1 is used, ar7/clock.c returns 0. Other drivers
> either return 0 or EINVAL.
>
> Since linux/clk.h returns 0 in the stub, I think 0 is the correct variant.

The ar7 returns 0 but the other stubs in ralink return -1.

Best regards,
Krzysztof