linux-kernel - Re: ingenic-adc.c:undefined reference to `clk_get

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Date:   Mon, 26 Apr 2021 14:05:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     kernel test robot <lkp@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Subject: Re: ingenic-adc.c:undefined reference to `clk_get_parent'

On 4/26/21 1:22 AM, Andy Shevchenko wrote:
> On Mon, Apr 26, 2021 at 8:43 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> [add linux-clk + maintainers]
>>
>> On 3/16/21 8:54 AM, kernel test robot wrote:
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   1a4431a5db2bf800c647ee0ed87f2727b8d6c29c
>>> commit: a07a4fe5ff460e99293c0d682421920d54e31d7f iio:adc:ingenic: drop of_match_ptr protection and include mod_devicetable.h
>>> date:   8 months ago
>>> config: mips-randconfig-p001-20210316 (attached as .config)
>>> compiler: mips-linux-gcc (GCC) 9.3.0
>>> reproduce (this is a W=1 build):
>>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>         chmod +x ~/bin/make.cross
>>>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a07a4fe5ff460e99293c0d682421920d54e31d7f
>>>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>         git fetch --no-tags linus master
>>>         git checkout a07a4fe5ff460e99293c0d682421920d54e31d7f
>>>         # save the attached .config to linux build tree
>>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
>>>
>>> If you fix the issue, kindly add following tag as appropriate
>>> Reported-by: kernel test robot <lkp@...el.com>
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>    mips-linux-ld: drivers/iio/adc/ingenic-adc.o: in function `jz4770_adc_init_clk_div':
>>>>> ingenic-adc.c:(.text+0x8c): undefined reference to `clk_get_parent'
>>>    mips-linux-ld: drivers/iio/adc/ingenic-adc.o: in function `jz4725b_adc_init_clk_div':
>>>    ingenic-adc.c:(.text+0x164): undefined reference to `clk_get_parent'
>>
>> Hi,
>>
>> My guess (analysis) suggests that this problem is due to
>> a difference in when clk_get_parent() is available between
>> <linux/clk.h> where it depends on CONFIG_HAVE_CLK and
>> drivers/clk/clk.c, which is built iff CONFIG_COMMON_CLK.
>>
>> Any comments/suggestions?
> 
> I haven't looked into it, but IIRC MIPS has its own clock API
> implementation (or I mixed it with another arch?) and that's the root
> of many issues like this around the kernel.


Thanks. I do see that (MIPS) CONFIG_RA7 and CONFIG_RALINK
provide their own clk_get_parent(), but neither of those is
enabled in the kernel config file.

I'll post some kind of patch later today.

-- 
~Randy