linux-kernel - Re: [PATCH] i2c: i2c-stm32f7: Add I2C_SMBUS_I2C_BLOCK

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Message-ID: <20190629113229.GF1685@kunai>
Date:   Sat, 29 Jun 2019 13:32:29 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     pierre-yves.mordret@...com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...com, linux-i2c@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: i2c-stm32f7: Add I2C_SMBUS_I2C_BLOCK_DATA support

On Tue, Jun 04, 2019 at 03:20:51PM +0200, Fabrice Gasnier wrote:
> This patch adds the support of I2C_SMBUS_I2C_BLOCK_DATA transaction type
> for the stm32f7 SMBUS Controller.
> Use emulated I2C_SMBUS_I2C_BLOCK_DATA transactions as there is no specific
> hardware in STM32 I2C to manage this (e.g. like no need for PEC here).
> Emulated transfer will fall back calling i2c transfer method where there's
> already support for DMAs for example.
> So, use the I2C_FUNC_SMBUS_I2C_BLOCK in stm32f7_i2c_func(), and rely on
> emulated transfer by returning -EOPNOTSUPP in the smbus_xfer() routine
> for such a case.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>

Applied to for-next, thanks!


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