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

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Date:   Wed, 17 Mar 2021 10:56:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     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
Cc:     thierry.reding@...il.com, linux-tegra@...r.kernel.org,
        balbi@...nel.org, linux-usb@...r.kernel.org, digetx@...il.com,
        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 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?

Best regards,
Krzysztof