1 
2 #ifndef __MACH_SPI_H_
3 #define __MACH_SPI_H_
4 
5 /*
6  * struct spi_imx_master - device.platform_data for SPI controller devices.
7  * @chipselect: Array of chipselects for this master. Numbers >= 0 mean gpio
8  *              pins, numbers < 0 mean internal CSPI chipselects according
9  *              to MXC_SPI_CS(). Normally you want to use gpio based chip
10  *              selects as the CSPI module tries to be intelligent about
11  *              when to assert the chipselect: The CSPI module deasserts the
12  *              chipselect once it runs out of input data. The other problem
13  *              is that it is not possible to mix between high active and low
14  *              active chipselects on one single bus using the internal
15  *              chipselects. Unfortunately Freescale decided to put some
16  *              chipselects on dedicated pins which are not usable as gpios,
17  *              so we have to support the internal chipselects.
18  * @num_chipselect: ARRAY_SIZE(chipselect)
19  */
20 struct spi_imx_master {
21 	int	*chipselect;
22 	int	num_chipselect;
23 };
24 
25 #define MXC_SPI_CS(no)	((no) - 32)
26 
27 #endif /* __MACH_SPI_H_*/
28