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

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Message-ID: <ecbcbeae-1eb8-d20e-04b6-2c65f136799f@canonical.com>
Date:   Wed, 17 Mar 2021 09:12:20 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        John Crispin <john@...ozen.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     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 17/03/2021 01:10, Dmitry Osipenko wrote:
> 16.03.2021 20:57, Krzysztof Kozlowski пишет:
>> 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;
>> +}
>> +EXPORT_SYMBOL(clk_set_parent);
>> +
>> +struct clk *clk_get_parent(struct clk *clk)
>> +{
>> +	WARN_ON(clk);
>> +	return NULL;
>> +}
>> +EXPORT_SYMBOL(clk_get_parent);
> 
> I'm wondering whether symbols should be GPL or it doesn't matter in this
> case. Otherwise this looks good to me.

The ones in arch/mips/ar7/clock.c were not GPL but other stubs already
defined here are, so indeed I'll make them GPL for consistency.

> 
> Also, I guess it should be possible to create a generic clk stubs that
> will use weak functions, allowing platforms to override only the wanted
> stubs and then we won't need to worry about the missing stubs for each
> platform individually. But of course that will be a much bigger change.
> Just wanted to share my thoughts.

Yes, it would be a good idea but also a bigger task. I am not sure if
these platforms are alive enough to get that attention.

Best regards,
Krzysztof