linux-kernel - Re: [PATCH v1 1/1] iio: core: Convert to use firmware node handle instead of OF node

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Date:   Sat, 16 Apr 2022 12:17:08 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v1 1/1] iio: core: Convert to use firmware node handle
 instead of OF node

On Wed, 13 Apr 2022 21:02:02 +0300
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> Switch the IIO core to use firmware node handle instead of OF node.
> This will allow to get label from firmware on non-OF systems.
> 
> Note, this doesn't change of_iio_*() APIs for now.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Applied to the togreg branch of iio.git and pushed out as testing for
0-day to poke at this and see if we missed anything.

Thanks,

Jonathan

> ---
>  drivers/iio/industrialio-core.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 2f48e9a97274..ffbe76806e07 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1893,20 +1893,22 @@ static const struct iio_buffer_setup_ops noop_ring_setup_ops;
>  int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
>  {
>  	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
> -	const char *label;
> +	struct fwnode_handle *fwnode;
>  	int ret;
>  
>  	if (!indio_dev->info)
>  		return -EINVAL;
>  
>  	iio_dev_opaque->driver_module = this_mod;
> -	/* If the calling driver did not initialize of_node, do it here */
> -	if (!indio_dev->dev.of_node && indio_dev->dev.parent)
> -		indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
>  
> -	label = of_get_property(indio_dev->dev.of_node, "label", NULL);
> -	if (label)
> -		indio_dev->label = label;
> +	/* If the calling driver did not initialize firmware node, do it here */
> +	if (dev_fwnode(&indio_dev->dev))
> +		fwnode = dev_fwnode(&indio_dev->dev);
> +	else
> +		fwnode = dev_fwnode(indio_dev->dev.parent);
> +	device_set_node(&indio_dev->dev, fwnode);
> +
> +	fwnode_property_read_string(fwnode, "label", &indio_dev->label);
>  
>  	ret = iio_check_unique_scan_index(indio_dev);
>  	if (ret < 0)