On 11/06/2014 01:51 PM, Vladimir Zapolskiy wrote:
> Hi Ezequiel,
>
> On 05.11.2014 22:21, Ezequiel Garcia wrote:
>> From: James Hogan <james.hogan@xxxxxxxxxx>
>>
>> Add support for the IMG I2C Serial Control Bus (SCB) found on the
>> Pistachio and TZ1090 SoCs.
>>
>> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
>> [Ezequiel: code cleaning and rebasing]
>> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxx>
>> ---
>> drivers/i2c/busses/Kconfig | 10 +
>> drivers/i2c/busses/Makefile | 1 +
>> drivers/i2c/busses/i2c-img-scb.c | 1397 ++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 1408 insertions(+)
>> create mode 100644 drivers/i2c/busses/i2c-img-scb.c
>>
>
> [snip]
>
>> +static int img_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
>> + int num)
>> +{
>> + struct img_i2c *i2c = i2c_get_adapdata(i2c_adap);
>> + bool atomic = false;
>> + int i;
>> +
>> + if (i2c->mode == MODE_SUSPEND) {
>> + WARN(1, "refusing to service transaction in suspended state\n");
>> + return -EIO;
>> + }
>> +
>> + if (i2c->mode == MODE_FATAL)
>> + return -EIO;
>> +
>> + for (i = 0; i < num; i++) {
>> + if (likely(msgs[i].len))
>> + continue;
>> + /*
>> + * 0 byte reads are not possible because the slave could try
>> + * and pull the data line low, preventing a stop bit.
>> + */
>> + if (unlikely(msgs[i].flags & I2C_M_RD))
>> + return -EIO;
>> + /*
>> + * 0 byte writes are possible and used for probing, but we
>> + * cannot do them in automatic mode, so use atomic mode
>> + * instead.
>> + */
>> + atomic = true;
>> + }
>> +
>> + clk_prepare_enable(i2c->scb_clk);
>
> Does it make sense to add a check for returned error here?
>
Right, that makes sense.
--
Ezequiel
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