Re: [PATCH v5 3/5] i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller

[Wolfram Sang <wsa@the-dreams.de>]

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Hi,

On Fri, Mar 23, 2018 at 02:20:59PM -0600, Karthikeyan Ramasubramanian wrote:
> This bus driver supports the GENI based i2c hardware controller in the
> Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable
> module supporting a wide range of serial interfaces including I2C. The
> driver supports FIFO mode and DMA mode of transfer and switches modes
> dynamically depending on the size of the transfer.
> 
> Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
> Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
> Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>

Is one of these people interested in maintaining this driver? Then, an
entry for MAINTAINERS would be needed, too. (Same goes for
drivers/soc/qcom/ IMHO, but this is not my realm, so just saying)

> +static const struct geni_i2c_err_log gi2c_log[] = {
> +	[GP_IRQ0] = {-EINVAL, "Unknown I2C err GP_IRQ0"},
> +	[NACK] = {-ENOTCONN, "NACK: slv unresponsive, check its power/reset-ln"},
> +	[GP_IRQ2] = {-EINVAL, "Unknown I2C err GP IRQ2"},
> +	[BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unepxected start/stop"},
> +	[ARB_LOST] = {-EBUSY, "Bus arbitration lost, clock line undriveable"},
> +	[GP_IRQ5] = {-EINVAL, "Unknown I2C err GP IRQ5"},
> +	[GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},
> +	[GENI_ILLEGAL_CMD] = {-EILSEQ, "Illegal cmd, check GENI cmd-state machine"},
> +	[GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"},
> +	[GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"},
> +};

Please check Documentation/i2c/fault-codes for better -ERRNO values,
especially for NACK and ARB_LOST.

Rest looks good from a glimpse.

Thanks,

   Wolfram


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