linux-kernel - Re: [PATCH v5 2/5] i2c: Add STM32F4 I2C driver

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Date:   Thu, 8 Dec 2016 19:42:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     M'boumba Cedric Madianga <cedric.madianga@...il.com>
Cc:     kbuild-all@...org, wsa@...-dreams.de, robh+dt@...nel.org,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        linus.walleij@...aro.org, patrice.chotard@...com,
        linux@...linux.org.uk, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        M'boumba Cedric Madianga <cedric.madianga@...il.com>
Subject: Re: [PATCH v5 2/5] i2c: Add STM32F4 I2C driver

Hi M'boumba,

[auto build test WARNING on wsa/i2c/for-next]
[also build test WARNING on v4.9-rc8 next-20161208]
[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/M-boumba-Cedric-Madianga/Add-support-for-the-STM32F4-I2C/20161208-173240
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: openrisc-allyesconfig (attached as .config)
compiler: or32-linux-gcc (GCC) 4.5.1-or32-1.0rc1
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All warnings (new ones prefixed by >>):

   drivers/i2c/busses/i2c-stm32f4.c: In function 'stm32f4_i2c_set_periph_clk_freq':
>> drivers/i2c/busses/i2c-stm32f4.c:201:9: warning: comparison of distinct pointer types lacks a cast
>> drivers/i2c/busses/i2c-stm32f4.c:201:9: warning: comparison of distinct pointer types lacks a cast
>> drivers/i2c/busses/i2c-stm32f4.c:201:9: warning: comparison of distinct pointer types lacks a cast

vim +201 drivers/i2c/busses/i2c-stm32f4.c

   185	
   186	static void stm32f4_i2c_disable_it(struct stm32f4_i2c_dev *i2c_dev)
   187	{
   188		void __iomem *reg = i2c_dev->base + STM32F4_I2C_CR2;
   189	
   190		stm32f4_i2c_clr_bits(reg, STM32F4_I2C_CR2_IRQ_MASK);
   191	}
   192	
   193	static void stm32f4_i2c_set_periph_clk_freq(struct stm32f4_i2c_dev *i2c_dev)
   194	{
   195		u32 clk_rate, cr2, freq;
   196	
   197		cr2 = readl_relaxed(i2c_dev->base + STM32F4_I2C_CR2);
   198		cr2 &= ~STM32F4_I2C_CR2_FREQ_MASK;
   199		clk_rate = clk_get_rate(i2c_dev->clk);
   200		freq = clk_rate / MHZ_TO_HZ;
 > 201		freq = clamp(freq, STM32F4_I2C_MIN_FREQ, STM32F4_I2C_MAX_FREQ);
   202		cr2 |= STM32F4_I2C_CR2_FREQ(freq);
   203		writel_relaxed(cr2, i2c_dev->base + STM32F4_I2C_CR2);
   204	}
   205	
   206	static void stm32f4_i2c_set_rise_time(struct stm32f4_i2c_dev *i2c_dev)
   207	{
   208		u32 trise, freq, cr2, val;
   209	

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