[PATCH v9 4/5] i2c: aspeed: added driver for Aspeed I2C

[Benjamin Herrenschmidt]

On Fri, 2017-06-02 at 01:46 -0700, Brendan Higgins wrote:
> Added initial master support for Aspeed I2C controller. Supports
> fourteen busses present in AST24XX and AST25XX BMC SoCs by Aspeed.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins at google.com>

Reviewed-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---

Just spotted a completely minor/tivial nit:

> +static int aspeed_i2c_master_xfer(struct i2c_adapter *adap,
> +				  struct i2c_msg *msgs, int num)
> +{
> +	struct aspeed_i2c_bus *bus = adap->algo_data;
> +	unsigned long time_left, flags;
> +	int ret = 0;
> +
> +	spin_lock_irqsave(&bus->lock, flags);
> +	bus->cmd_err = 0;
        ^^^^^^^^^^^^^^^^^

This is probably unnecessary now since it's initialized further down.

> +	/* If bus is busy, attempt recovery. We assume a single master
> +	 * environment.
> +	 */
> +	if (readl(bus->base + ASPEED_I2C_CMD_REG) & ASPEED_I2CD_BUS_BUSY_STS) {
> +		spin_unlock_irqrestore(&bus->lock, flags);
> +		ret = aspeed_i2c_recover_bus(bus);
> +		if (ret)
> +			return ret;
> +		spin_lock_irqsave(&bus->lock, flags);
> +	}
> +
> +	bus->cmd_err = 0;
> +	bus->msgs = msgs;
> +	bus->msgs_index = 0;
> +	bus->msgs_count = num;

Now I'd like Andrew to give it a spin as he's currently
testing/debugging some i2c related stuff to be 100% certain it works
fine on our systems.

Thanks !

Cheers,
Ben.