Re: [PATCH V7 3/6] usb: typec: ucsi_ccg: Add OF support

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Hi,

On Tue, Jan 24, 2023 at 11:43:15AM +0000, Jon Hunter wrote:
> From: Wayne Chang <waynec@xxxxxxxxxx>
> 
> Add device-tree support for the Cypress CCG UCSI driver. The device-tree
> binding for the Cypress CCG device uses the standard device-tree
> 'firmware-name' string property to indicate the firmware build that is
> used.
> 
> The NVIDIA GPU I2C driver has been updated to use an ACPI string
> property that is also named 'firmware-build' and given that this was the
> only users of the 'ccgx,firmware-build' property, we can now remove
> support for this legacy property.
> 
> Signed-off-by: Wayne Chang <waynec@xxxxxxxxxx>
> Co-developed-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>

You missed one nitpick in v6 - check below. But that's minor, so if
there's nothing else:

Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

> ---
> V6 -> V7: removed 'ccgx,firmware-build' property
> V5 -> V6: fixed compilation
> V4 -> V5: add support for 'firmware-name'
> V1 -> V4: nothing has changed
> 
>  drivers/usb/typec/ucsi/ucsi_ccg.c | 23 +++++++++++++++++++----
>  1 file changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
> index 46441f1477f2..8f5ad2094f26 100644
> --- a/drivers/usb/typec/ucsi/ucsi_ccg.c
> +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
> @@ -643,7 +643,7 @@ static int ccg_request_irq(struct ucsi_ccg *uc)
>  {
>  	unsigned long flags = IRQF_ONESHOT;
>  
> -	if (!has_acpi_companion(uc->dev))
> +	if (!dev_fwnode(uc->dev))
>  		flags |= IRQF_TRIGGER_HIGH;
>  
>  	return request_threaded_irq(uc->irq, NULL, ccg_irq_handler, flags, dev_name(uc->dev), uc);
> @@ -1342,6 +1342,7 @@ static int ucsi_ccg_probe(struct i2c_client *client)
>  {
>  	struct device *dev = &client->dev;
>  	struct ucsi_ccg *uc;
> +	const char *fw_name;
>  	int status;
>  
>  	uc = devm_kzalloc(dev, sizeof(*uc), GFP_KERNEL);
> @@ -1357,9 +1358,16 @@ static int ucsi_ccg_probe(struct i2c_client *client)
>  	INIT_WORK(&uc->pm_work, ccg_pm_workaround_work);
>  
>  	/* Only fail FW flashing when FW build information is not provided */
> -	status = device_property_read_u16(dev, "ccgx,firmware-build",
> -					  &uc->fw_build);
> -	if (status)
> +	status = device_property_read_string(dev, "firmware-name",
> +					     &fw_name);

One line is enough:

	status = device_property_read_string(dev, "firmware-name", &fw_name);

> +	if (!status) {
> +		if (!strcmp(fw_name, "nvidia,jetson-agx-xavier"))
> +			uc->fw_build = CCG_FW_BUILD_NVIDIA_TEGRA;
> +		else if (!strcmp(fw_name, "nvidia,gpu"))
> +			uc->fw_build = CCG_FW_BUILD_NVIDIA;
> +	}
> +
> +	if (!uc->fw_build)
>  		dev_err(uc->dev, "failed to get FW build information\n");
>  
>  	/* reset ccg device and initialize ucsi */
> @@ -1426,6 +1434,12 @@ static void ucsi_ccg_remove(struct i2c_client *client)
>  	free_irq(uc->irq, uc);
>  }
>  
> +static const struct of_device_id ucsi_ccg_of_match_table[] = {
> +		{ .compatible = "cypress,cypd4226", },
> +		{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, ucsi_ccg_of_match_table);
> +
>  static const struct i2c_device_id ucsi_ccg_device_id[] = {
>  	{"ccgx-ucsi", 0},
>  	{}
> @@ -1480,6 +1494,7 @@ static struct i2c_driver ucsi_ccg_driver = {
>  		.pm = &ucsi_ccg_pm,
>  		.dev_groups = ucsi_ccg_groups,
>  		.acpi_match_table = amd_i2c_ucsi_match,
> +		.of_match_table = ucsi_ccg_of_match_table,
>  	},
>  	.probe_new = ucsi_ccg_probe,
>  	.remove = ucsi_ccg_remove,
> -- 
> 2.25.1

thanks,

-- 
heikki



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