Hi Ezequiel,
On 05.11.2014 22:21, Ezequiel Garcia wrote:
> From: James Hogan <[email protected]>
>
> Add support for the IMG I2C Serial Control Bus (SCB) found on the
> Pistachio and TZ1090 SoCs.
>
> Signed-off-by: James Hogan <[email protected]>
> [Ezequiel: code cleaning and rebasing]
> Signed-off-by: Ezequiel Garcia <[email protected]>
> ---
> 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?
> + for (i = 0; i < num; i++) {
> + struct i2c_msg *msg = &msgs[i];
> + unsigned long flags;
> +
> + spin_lock_irqsave(&i2c->lock, flags);
> +
> + /*
> + * Make a copy of the message struct. We mustn't modify the
> + * original or we'll confuse drivers and i2c-dev.
> + */
> + i2c->msg = *msg;
> + i2c->msg_status = 0;
> +
> + /*
[snip]
> +
> +static int img_i2c_resume(struct device *dev)
> +{
> + struct img_i2c *i2c = dev_get_drvdata(dev);
> +
> + clk_enable(i2c->sys_clk);
Same question as above.
> + img_i2c_init(i2c);
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static SIMPLE_DEV_PM_OPS(img_i2c_pm, img_i2c_suspend, img_i2c_resume);
> +
> +static const struct of_device_id img_scb_i2c_match[] = {
> + { .compatible = "img,scb-i2c" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, img_scb_i2c_match);
> +
> +static struct platform_driver img_scb_i2c_driver = {
> + .driver = {
> + .name = "img-i2c-scb",
> + .of_match_table = img_scb_i2c_match,
> + .pm = &img_i2c_pm,
> + },
> + .probe = img_i2c_probe,
> + .remove = img_i2c_remove,
> +};
> +module_platform_driver(img_scb_i2c_driver);
> +
> +MODULE_AUTHOR("James Hogan <[email protected]>");
> +MODULE_DESCRIPTION("IMG host I2C driver");
> +MODULE_LICENSE("GPL");
>
--
With best wishes,
Vladimir
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