linux-kernel - Re: [PATCH v2 2/2] iio: adc: ad7606: finish pwm_get_state

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Message-ID: <d44ab5s73kmochmwis3buhd6ci7ff4rwd7kgh47aqar6xeyqna@f4plwf6qbvlm>
Date: Sun, 3 Nov 2024 15:00:14 +0100
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: David Lechner <dlechner@...libre.com>
Cc: kernel test robot <lkp@...el.com>, Jonathan Cameron <jic23@...nel.org>, 
	Guillaume Stols <gstols@...libre.com>, oe-kbuild-all@...ts.linux.dev, 
	Michael Hennerich <Michael.Hennerich@...log.com>, linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: adc: ad7606: finish pwm_get_state_hw() TODO

Hello David,

On Sat, Nov 02, 2024 at 01:50:35AM +0800, kernel test robot wrote:
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on 6fb2fa9805c501d9ade047fc511961f3273cdcb5]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/David-Lechner/pwm-core-export-pwm_get_state_hw/20241030-052134
> base:   6fb2fa9805c501d9ade047fc511961f3273cdcb5
> patch link:    https://lore.kernel.org/r/20241029-pwm-export-pwm_get_state_hw-v2-2-03ba063a3230%40baylibre.com
> patch subject: [PATCH v2 2/2] iio: adc: ad7606: finish pwm_get_state_hw() TODO
> config: i386-randconfig-141-20241101 (https://download.01.org/0day-ci/archive/20241102/202411020101.5Hs6MkwQ-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241102/202411020101.5Hs6MkwQ-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202411020101.5Hs6MkwQ-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    drivers/iio/adc/ad7606.c: In function 'ad7606_read_raw':
> >> drivers/iio/adc/ad7606.c:765:23: error: implicit declaration of function 'pwm_get_state_hw'; did you mean 'pwm_get_state'? [-Werror=implicit-function-declaration]
>      765 |                 ret = pwm_get_state_hw(st->cnvst_pwm, &cnvst_pwm_state);
>          |                       ^~~~~~~~~~~~~~~~
>          |                       pwm_get_state
>    cc1: some warnings being treated as errors

The problem here is that there is no declaration (and implementation) of
pwm_get_state_hw() with CONFIG_PWM=n. Does it make sense to enable the
ad7606 driver without enabling PWM support? If yes, we should add a
dummy implementation of pwm_get_state_hw(), if not, a depends on PWM
should be introduced.

Best regards
Uwe

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