linux-kernel - Re: [PATCH v3 2/5] i2c: Add STM32F4 I2C driver

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Date:   Wed, 30 Nov 2016 17:23:53 +0100
From:   Wolfram Sang <wsa-dev@...g-engineering.com>
To:     M'boumba Cedric Madianga <cedric.madianga@...il.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Patrice Chotard <patrice.chotard@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>, linux@...linux.org.uk,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alexandre.torgue@...com
Subject: Re: [PATCH v3 2/5] i2c: Add STM32F4 I2C driver

Hi,

> I was too busy in another project but now I am ready to complete the
> upstream of the STM32F4 I2C driver.

Nice.

> >> +static void stm32f4_i2c_set_periph_clk_freq(struct stm32f4_i2c_dev *i2c_dev)
> >> +{
> >> +     u32 clk_rate, cr2, freq;
> >> +
> >> +     cr2 = readl_relaxed(i2c_dev->base + STM32F4_I2C_CR2);
> >> +     cr2 &= ~STM32F4_I2C_CR2_FREQ_MASK;
> >> +
> >> +     clk_rate = clk_get_rate(i2c_dev->clk);
> >> +     freq = clk_rate / MHZ_TO_HZ;
> >> +
> >> +     if (freq > STM32F4_I2C_MAX_FREQ)
> >> +             freq = STM32F4_I2C_MAX_FREQ;
> >> +     if (freq < STM32F4_I2C_MIN_FREQ)
> >> +             freq = STM32F4_I2C_MIN_FREQ;
> >
> > clamp() to enforce the range?
> Sorry but what do you mean by "clamp()" ?

The kernel has a clamp() function which would fit this purpose, I think.

Regards,

   Wolfram


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