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Commit 284b0189 authored by Grant Likely's avatar Grant Likely
Browse files

spi: Add OF binding support for SPI busses 



This patch adds support for populating an SPI bus based on data in the
OF device tree.  This is useful for powerpc platforms which use the
device tree instead of discrete code for describing platform layout.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent dc87c98e

drivers/of/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -13,3 +13,9 @@ config OF_I2C 
	depends on PPC_OF && I2C

	help

	  OpenFirmware I2C accessors



config OF_SPI

	def_tristate SPI

	depends on OF && PPC_OF && SPI

	help

	  OpenFirmware SPI accessors

drivers/of/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,3 +2,4 @@ obj-y = base.o 
obj-$(CONFIG_OF_DEVICE) += device.o platform.o

obj-$(CONFIG_OF_GPIO)   += gpio.o

obj-$(CONFIG_OF_I2C)	+= of_i2c.o

obj-$(CONFIG_OF_SPI)	+= of_spi.o

drivers/of/of_spi.c

0 → 100644
+93 −0
Original line number Diff line number Diff line 
/*

 * SPI OF support routines

 * Copyright (C) 2008 Secret Lab Technologies Ltd.

 *

 * Support routines for deriving SPI device attachments from the device

 * tree.

 */



#include <linux/of.h>

#include <linux/device.h>

#include <linux/spi/spi.h>

#include <linux/of_spi.h>



/**

 * of_register_spi_devices - Register child devices onto the SPI bus

 * @master:	Pointer to spi_master device

 * @np:		parent node of SPI device nodes

 *

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

 * property.

 */

void of_register_spi_devices(struct spi_master *master, struct device_node *np)

{

	struct spi_device *spi;

	struct device_node *nc;

	const u32 *prop;

	int rc;

	int len;



	for_each_child_of_node(np, 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;

		}



		/* Select device driver */

		if (of_modalias_node(nc, spi->modalias,

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

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

				nc->full_name);

			spi_dev_put(spi);

			continue;

		}



		/* Device address */

		prop = of_get_property(nc, "reg", &len);

		if (!prop || len < sizeof(*prop)) {

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

				nc->full_name);

			spi_dev_put(spi);

			continue;

		}

		spi->chip_select = *prop;



		/* Mode (clock phase/polarity/etc.) */

		if (of_find_property(nc, "spi-cpha", NULL))

			spi->mode |= SPI_CPHA;

		if (of_find_property(nc, "spi-cpol", NULL))

			spi->mode |= SPI_CPOL;



		/* Device speed */

		prop = of_get_property(nc, "spi-max-frequency", &len);

		if (!prop || len < sizeof(*prop)) {

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

				nc->full_name);

			spi_dev_put(spi);

			continue;

		}

		spi->max_speed_hz = *prop;



		/* IRQ */

		spi->irq = irq_of_parse_and_map(nc, 0);



		/* Store a pointer to the node in the device structure */

		of_node_get(nc);

		spi->dev.archdata.of_node = nc;



		/* Register the new device */

		request_module(spi->modalias);

		rc = spi_add_device(spi);

		if (rc) {

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

				nc->full_name);

			spi_dev_put(spi);

		}



	}

}

EXPORT_SYMBOL(of_register_spi_devices);

include/linux/of_spi.h

0 → 100644
+18 −0
Original line number Diff line number Diff line 
/*

 * OpenFirmware SPI support routines

 * Copyright (C) 2008 Secret Lab Technologies Ltd.

 *

 * Support routines for deriving SPI device attachments from the device

 * tree.

 */



#ifndef __LINUX_OF_SPI_H

#define __LINUX_OF_SPI_H



#include <linux/of.h>

#include <linux/spi/spi.h>



extern void of_register_spi_devices(struct spi_master *master,

				    struct device_node *np);



#endif /* __LINUX_OF_SPI */