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Subject: Re: [PATCH] MIPS: ralink: define stubs for clk_set_parent to fix
 compile testing
To:     Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        John Crispin <john@phrozen.org>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     thierry.reding@gmail.com, linux-tegra@vger.kernel.org,
        balbi@kernel.org, linux-usb@vger.kernel.org, digetx@gmail.com,
        kernel test robot <lkp@intel.com>
References: <20210316175725.79981-1-krzysztof.kozlowski@canonical.com>
From:   Sergei Shtylyov <sergei.shtylyov@gmail.com>
Organization: Brain-dead Software
Message-ID: <880d5e61-fec5-e7d6-7403-b1823c77b3c1@gmail.com>
Date:   Wed, 17 Mar 2021 12:52:14 +0300
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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@intel.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.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)?

> +}
> +EXPORT_SYMBOL(clk_set_parent);
> +
> +struct clk *clk_get_parent(struct clk *clk)
> +{
> +	WARN_ON(clk);
> +	return NULL;
> +}
> +EXPORT_SYMBOL(clk_get_parent);
> +
>   void __init plat_time_init(void)
>   {
>   	struct clk *clk;

MBR, Sergei