linux-kernel - Re: [PATCH 3/8] iio: add child nodes support in iio backend framework

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Message-ID: <1a5989f2-1285-4c55-833e-e18dfe973363@foss.st.com>
Date: Wed, 19 Jun 2024 18:00:30 +0200
From: Olivier MOYSAN <olivier.moysan@...s.st.com>
To: Nuno Sá <noname.nuno@...il.com>,
        Nuno Sa
	<nuno.sa@...log.com>, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen
	<lars@...afoo.de>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8] iio: add child nodes support in iio backend framework



On 6/19/24 07:31, Nuno Sá wrote:
> On Tue, 2024-06-18 at 18:08 +0200, Olivier Moysan wrote:
>> Add an API to support IIO generic channels binding:
>> http://devicetree.org/schemas/iio/adc/adc.yaml#
>> This new API is needed, as generic channel DT node
>> isn't populated as a device.
>> Add devm_iio_backend_subnode_get() to allow an IIO device
>> backend consumer to configure backend phandles in its
>> child nodes.
>>
>> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
>> ---
> 
> Again small notes nits. With it:
> 
> Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> 
>>   drivers/iio/industrialio-backend.c | 48 ++++++++++++++++++++++--------
>>   include/linux/iio/backend.h        |  2 ++
>>   2 files changed, 38 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
>> backend.c
>> index d3db048c086b..e9d29131634d 100644
>> --- a/drivers/iio/industrialio-backend.c
>> +++ b/drivers/iio/industrialio-backend.c
>> @@ -575,17 +575,8 @@ static int __devm_iio_backend_get(struct device *dev, struct
>> iio_backend *back)
>>   	return 0;
>>   }
>>   
>> -/**
>> - * devm_iio_backend_get - Device managed backend device get
>> - * @dev: Consumer device for the backend
>> - * @name: Backend name
>> - *
>> - * Get's the backend associated with @dev.
>> - *
>> - * RETURNS:
>> - * A backend pointer, negative error pointer otherwise.
>> - */
>> -struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
>> +static struct iio_backend *__devm_iio_backend_node_get(struct device *dev, const
>> char *name,
>> +						       struct fwnode_handle *node)
> 
> I would call it __devm_iio_backend_fwnode_get(). Also the parameter node -> fwnode.
> 
>>   {
>>   	struct fwnode_handle *fwnode;
>>   	struct iio_backend *back;
>> @@ -602,7 +593,7 @@ struct iio_backend *devm_iio_backend_get(struct device *dev,
>> const char *name)
>>   		index = 0;
>>   	}
>>   
>> -	fwnode = fwnode_find_reference(dev_fwnode(dev), "io-backends", index);
>> +	fwnode = fwnode_find_reference(node, "io-backends", index);
>>   	if (IS_ERR(fwnode)) {
>>   		dev_err_probe(dev, PTR_ERR(fwnode),
>>   			      "Cannot get Firmware reference\n");
>> @@ -625,8 +616,41 @@ struct iio_backend *devm_iio_backend_get(struct device *dev,
>> const char *name)
>>   	fwnode_handle_put(fwnode);
>>   	return ERR_PTR(-EPROBE_DEFER);
>>   }
>> +
>> +/**
>> + * devm_iio_backend_get - Device managed backend device get
>> + * @dev: Consumer device for the backend
>> + * @name: Backend name
>> + *
>> + * Get's the backend associated with @dev.
>> + *
>> + * RETURNS:
>> + * A backend pointer, negative error pointer otherwise.
>> + */
>> +struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
>> +{
>> +	return __devm_iio_backend_node_get(dev, name, dev_fwnode(dev));
>> +}
>>   EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get, IIO_BACKEND);
>>   
>> +/**
>> + * devm_iio_backend_subnode_get - Device managed backend device get
>> + * @dev: Consumer device for the backend
>> + * @name: Backend name
>> + * @node: Firmware node of the backend consumer
>> + *
>> + * Get's the backend associated with @dev.
>> + *
>> + * RETURNS:
>> + * A backend pointer, negative error pointer otherwise.
>> + */
>> +struct iio_backend *devm_iio_backend_subnode_get(struct device *dev, const char
>> *name,
>> +						 struct fwnode_handle *node)
> 
> Again, for consistency devm_iio_backend_fwnode_get(). And node -> fwnode
> 

Done.
Thanks
Olivier

> - Nuno Sá
> 
>