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spi_flash: Add spi_flash_probe_fdt() to locate SPI by FDT node

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This allows us to put the SPI flash chip inside the SPI interface node,
with U-Boot finding the correct bus and chip select automatically.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2013-12-03 16:43:24 -07:00
parent 7b3efc6699
commit 0efc02499f
7 changed files with 77 additions and 17 deletions
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23
include/spi.h
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@@ -259,13 +259,24 @@ static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
* spi_free_slave() to free it later.
*
* @param blob: Device tree blob
* @param node: SPI peripheral node to use
* @param cs: Chip select to use
* @param max_hz: Maximum SCK rate in Hz (0 for default)
* @param mode: Clock polarity, clock phase and other parameters
* @param slave_node: Slave node to use
* @param spi_node: SPI peripheral node to use
* @return pointer to new spi_slave structure
*/
struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
unsigned int cs, unsigned int max_hz, unsigned int mode);
struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node,
int spi_node);
/**
* spi_base_setup_slave_fdt() - helper function to set up a SPI slace
*
* This decodes SPI properties from the slave node to determine the
* chip select and SPI parameters.
*
* @blob: Device tree blob
* @busnum: Bus number to use
* @node: Device tree node for the SPI bus
*/
struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
int node);
#endif /* _SPI_H_ */