Commit aff5e3f8 authored by Pantelis Antoniou's avatar Pantelis Antoniou Committed by Grant Likely
Browse files

spi/of: Create new device registration method and accessors 



Dynamically inserting spi device nodes requires the use of a single
device registration method. Refactor the existing
of_register_spi_devices() to split out the core functionality for a
single device into a separate function; of_register_spi_device(). This
function will be used by the OF_DYNAMIC overlay code to make live
modifications to the tree.

Methods to lookup a device/master using a device node are added
as well, of_find_spi_master_by_node() & of_find_spi_device_by_node().

Signed-off-by: default avatarPantelis Antoniou <pantelis.antoniou@konsulko.com>
[grant.likely] Split patch into two pieces for clarity
Signed-off-by: default avatarGrant Likely <grant.likely@linaro.org>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Cc: <linux-spi@vger.kernel.org>
parent ea7513bb

drivers/spi/spi.c

+118 −104
Original line number Diff line number Diff line
@@ -1220,40 +1220,29 @@ err_init_queue: 
/*-------------------------------------------------------------------------*/



#if defined(CONFIG_OF)

/**

 * of_register_spi_devices() - Register child devices onto the SPI bus

 * @master:	Pointer to spi_master device

 *

 * Registers an spi_device for each child node of master node which has a 'reg'

 * property.

 */

static void of_register_spi_devices(struct spi_master *master)

static struct spi_device *

of_register_spi_device(struct spi_master *master, struct device_node *nc)

{

	struct spi_device *spi;

	struct device_node *nc;

	int rc;

	u32 value;



	if (!master->dev.of_node)

		return;



	for_each_available_child_of_node(master->dev.of_node, nc) {

	/* Alloc an spi_device */

	spi = spi_alloc_device(master);

	if (!spi) {

		dev_err(&master->dev, "spi_device alloc error for %s\n",

			nc->full_name);

			spi_dev_put(spi);

			continue;

		rc = -ENOMEM;

		goto err_out;

	}



	/* Select device driver */

		if (of_modalias_node(nc, spi->modalias,

				     sizeof(spi->modalias)) < 0) {

	rc = of_modalias_node(nc, spi->modalias,

				sizeof(spi->modalias));

	if (rc < 0) {

		dev_err(&master->dev, "cannot find modalias for %s\n",

			nc->full_name);

			spi_dev_put(spi);

			continue;

		goto err_out;

	}



	/* Device address */
@@ -1261,8 +1250,7 @@ static void of_register_spi_devices(struct spi_master *master) 
	if (rc) {

		dev_err(&master->dev, "%s has no valid 'reg' property (%d)\n",

			nc->full_name, rc);

			spi_dev_put(spi);

			continue;

		goto err_out;

	}

	spi->chip_select = value;
@@ -1320,8 +1308,7 @@ static void of_register_spi_devices(struct spi_master *master) 
	if (rc) {

		dev_err(&master->dev, "%s has no valid 'spi-max-frequency' property (%d)\n",

			nc->full_name, rc);

			spi_dev_put(spi);

			continue;

		goto err_out;

	}

	spi->max_speed_hz = value;
@@ -1338,9 +1325,36 @@ static void of_register_spi_devices(struct spi_master *master) 
	if (rc) {

		dev_err(&master->dev, "spi_device register error %s\n",

			nc->full_name);

		goto err_out;

	}



	return spi;



err_out:

	spi_dev_put(spi);

	return ERR_PTR(rc);

}



/**

 * of_register_spi_devices() - Register child devices onto the SPI bus

 * @master:	Pointer to spi_master device

 *

 * Registers an spi_device for each child node of master node which has a 'reg'

 * property.

 */

static void of_register_spi_devices(struct spi_master *master)

{

	struct spi_device *spi;

	struct device_node *nc;



	if (!master->dev.of_node)

		return;



	for_each_available_child_of_node(master->dev.of_node, nc) {

		spi = of_register_spi_device(master, nc);

		if (IS_ERR(spi))

			dev_warn(&master->dev, "Failed to create SPI device for %s\n",

				nc->full_name);

	}

}

#else

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