[PATCH v5] i2c: imx: support DMA defer probing

[Andi Shyti]

Hi Carlos,

> +	/*
> +	 * Init DMA config if supported, -ENODEV means DMA not enabled at
> +	 * this platform, that is not a real error, so just remind "only
> +	 * PIO mode is used". If DMA is enabled, but meet error when request
> +	 * DMA channel, error should be showed in probe error log. PIO mode
> +	 * should be available regardless of DMA.
> +	 */
> +	ret = i2c_imx_dma_request(i2c_imx, phy_addr);
> +	if (ret) {
> +		if (ret == -EPROBE_DEFER)
> +			goto clk_notifier_unregister;
> +		else if (ret == -ENODEV)
> +			dev_dbg(&pdev->dev, "Only use PIO mode\n");
> +		else
> +			dev_err_probe(&pdev->dev, ret, "Failed to setup DMA, only use PIO mode\n");

Just for understanding, should we quit in this last case, as
well?

Before we were ignoring ENODEV and EPROBE_DEFER, but now you are
making it clear that other failures like ENOMEM might happen.

Thanks,
Andi