linux-kernel - Re: [PATCH RESEND] i2c: tegra: Add SMBus block read function

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Message-ID: <bfed059f-046c-63e9-800f-b8c9b1544471@gmail.com>
Date:   Wed, 16 Feb 2022 00:33:35 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Mikko Perttunen <mperttunen@...dia.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Svyatoslav Ryhel <clamor95@...il.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>
Subject: Re: [PATCH RESEND] i2c: tegra: Add SMBus block read function

14.02.2022 07:49, Akhil R пишет:
>> It's unclear to me what's the point of emulating
>> I2C_FUNC_SMBUS_READ_BLOCK_DATA within the driver if you could use
>> i2c_smbus_read_i2c_block_data().
> We are looking to support I2C_M_RECV_LEN where the length is read from the
> first byte of data. I see that i2c_smbus_read_i2c_block_data() requires the length
> to be passed from the client driver.
> 
> BTW, I2C_FUNC_SMBUS_WRITE_BLOCK_DATA is also expected to be supported.
> It is included in I2C_FUNC_SMBUS_EMUL. I suppose, it doesn't require any additional
> change in the driver. The client driver should populate the first byte as the length
> of data to be transferred.

Please support both read and write.