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

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Date:   Sun, 11 Dec 2016 22:42:33 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     M'boumba Cedric Madianga <cedric.madianga@...il.com>
Cc:     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
Subject: Re: [PATCH v5 2/5] i2c: Add STM32F4 I2C driver

Hi,

> +config I2C_STM32F4
> +	tristate "STMicroelectronics STM32F4 I2C support"
> +	depends on ARCH_STM32  || COMPILE_TEST

Double space.

> +#define STM32F4_I2C_MIN_FREQ		2
> +#define STM32F4_I2C_MAX_FREQ		42

Those two must be unsigned to fix the build error (e.g. 2U) reported by
build-bot.

Also, I get the following build warnings:

  CC      drivers/i2c/busses/i2c-stm32f4.o
drivers/i2c/busses/i2c-stm32f4.c: In function ‘stm32f4_i2c_handle_rx_addr’:
drivers/i2c/busses/i2c-stm32f4.c:445:6: warning: variable ‘sr2’ set but not used [-Wunused-but-set-variable]
  u32 sr2;
      ^~~
drivers/i2c/busses/i2c-stm32f4.c: In function ‘stm32f4_i2c_isr_event’:
drivers/i2c/busses/i2c-stm32f4.c:496:41: warning: variable ‘sr2’ set but not used [-Wunused-but-set-variable]
  u32 real_status, possible_status, ien, sr2;

I assume those are reads to clear the register, so we really don't need
to save the value in a variable.

Rest is looking good.

Thanks,

   Wolfram


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