linux-kernel - Re: [PATCH 8/8] [media] s5p-mfc: Use clk bulk API

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Date:   Tue, 20 Feb 2018 09:56:35 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Maciej Purski <m.purski@...sung.com>
Cc:     kbuild-all@...org, linux-media@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Michael Turquette <mturquette@...libre.com>,
        Kamil Debski <kamil@...as.org>,
        Maciej Purski <m.purski@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Thibault Saunier <thibault.saunier@....samsung.com>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Hoegeun Kwon <hoegeun.kwon@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jeongtae Park <jtp.park@...sung.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Hans Verkuil <hansverk@...co.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 8/8] [media] s5p-mfc: Use clk bulk API

Hi Maciej,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on v4.16-rc2 next-20180219]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Maciej-Purski/Use-clk-bulk-API-in-exynos5433-drivers/20180220-054431
base:   git://linuxtv.org/media_tree.git master
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All warnings (new ones prefixed by >>):

   drivers/media/platform/s5p-mfc/s5p_mfc_pm.c: In function 's5p_mfc_init_pm':
>> drivers/media/platform/s5p-mfc/s5p_mfc_pm.c:39:7: warning: passing argument 3 of 'devm_clk_bulk_alloc' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
          pm->clk_names);
          ^~
   In file included from drivers/media/platform/s5p-mfc/s5p_mfc_pm.c:13:0:
   include/linux/clk.h:654:37: note: expected 'const char **' but argument is of type 'const char * const*'
    static inline struct clk_bulk_data *devm_clk_bulk_alloc(struct device *dev,
                                        ^~~~~~~~~~~~~~~~~~~

vim +39 drivers/media/platform/s5p-mfc/s5p_mfc_pm.c

    24	
    25	int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
    26	{
    27		int ret;
    28	
    29		pm = &dev->pm;
    30		p_dev = dev;
    31	
    32		pm->num_clocks = dev->variant->num_clocks;
    33		pm->clk_names = dev->variant->clk_names;
    34		pm->device = &dev->plat_dev->dev;
    35		pm->clock_gate = NULL;
    36	
    37		/* clock control */
    38		pm->clocks = devm_clk_bulk_alloc(pm->device, pm->num_clocks,
  > 39						 pm->clk_names);
    40		if (IS_ERR(pm->clocks))
    41			return PTR_ERR(pm->clocks);
    42	
    43		ret = devm_clk_bulk_get(pm->device, pm->num_clocks, pm->clocks);
    44		if (ret < 0)
    45			return ret;
    46	
    47		if (dev->variant->use_clock_gating)
    48			pm->clock_gate = pm->clocks[0].clk;
    49	
    50		pm_runtime_enable(pm->device);
    51		atomic_set(&clk_ref, 0);
    52		return 0;
    53	}
    54	

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