| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef __MACH_SPI_H_ |
| #define __MACH_SPI_H_ |
| |
| /* |
| * struct spi_imx_master - device.platform_data for SPI controller devices. |
| * @chipselect: Array of chipselects for this master or NULL. Numbers >= 0 |
| * mean GPIO pins, -ENOENT means internal CSPI chipselect |
| * matching the position in the array. E.g., if chipselect[1] = |
| * -ENOENT then a SPI slave using chip select 1 will use the |
| * native SS1 line of the CSPI. Omitting the array will use |
| * all native chip selects. |
| |
| * Normally you want to use gpio based chip selects as the CSPI |
| * module tries to be intelligent about when to assert the |
| * chipselect: The CSPI module deasserts the chipselect once it |
| * runs out of input data. The other problem is that it is not |
| * possible to mix between high active and low active chipselects |
| * on one single bus using the internal chipselects. |
| * Unfortunately, on some SoCs, Freescale decided to put some |
| * chipselects on dedicated pins which are not usable as gpios, |
| * so we have to support the internal chipselects. |
| * |
| * @num_chipselect: If @chipselect is specified, ARRAY_SIZE(chipselect), |
| * otherwise the number of native chip selects. |
| */ |
| struct spi_imx_master { |
| int *chipselect; |
| int num_chipselect; |
| }; |
| |
| #endif /* __MACH_SPI_H_*/ |
