#ifndef __LINUX_SPI_GPIO_H

#define __LINUX_SPI_GPIO_H

/*

 * For each bitbanged SPI bus, set up a platform_device node with:

 *   - name "spi_gpio"

 *   - id the same as the SPI bus number it implements

 *   - dev.platform data pointing to a struct spi_gpio_platform_data

 *

 * Or, see the driver code for information about speedups that are

 * possible on platforms that support inlined access for GPIOs (no

 * spi_gpio_platform_data is used).

 *

 * Use spi_board_info with these busses in the usual way, being sure

 * that the controller_data being the GPIO used for each device's

 * chipselect:

 *

 *	static struct spi_board_info ... [] = {

 *	...

 *		// this slave uses GPIO 42 for its chipselect

 *		.controller_data = (void *) 42,

 *	...

 *		// this one uses GPIO 86 for its chipselect

 *		.controller_data = (void *) 86,

 *	...

 *	};

 *

 * If the bitbanged bus is later switched to a "native" controller,

 * that platform_device and controller_data should be removed.

 */

/**

 * struct spi_gpio_platform_data - parameter for bitbanged SPI master

 * @sck: number of the GPIO used for clock output

 * @mosi: number of the GPIO used for Master Output, Slave In (MOSI) data

 * @miso: number of the GPIO used for Master Input, Slave Output (MISO) data

 * @num_chipselect: how many slaves to allow

 *

 * All GPIO signals used with the SPI bus managed through this driver

 * (chipselects, MOSI, MISO, SCK) must be configured as GPIOs, instead

 * of some alternate function.

 *

 * It can be convenient to use this driver with pins that have alternate

 * functions associated with a "native" SPI controller if a driver for that

 * controller is not available, or is missing important functionality.

 *

 * On platforms which can do so, configure MISO with a weak pullup unless

 * there's an external pullup on that signal.  That saves power by avoiding

 * floating signals.  (A weak pulldown would save power too, but many

 * drivers expect to see all-ones data as the no slave "response".)

 */

struct spi_gpio_platform_data {

	unsigned	sck;

	unsigned	mosi;

	unsigned	miso;

	u16		num_chipselect;

};

#endif /* __LINUX_SPI_GPIO_H */