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

[karo-tx-uboot.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b76a26cef053fea6528098db03172f113d87b007..7ddea9b026a969b4207792f1cfe9e39240e7fc48 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <fdtdec.h>
 #include <malloc.h>
 #include <spi.h>
 
@@ -37,3 +38,21 @@ void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
 
        return ptr;
 }
+
+#ifdef CONFIG_OF_SPI
+struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
+                                          int node)
+{
+       int cs, max_hz, mode = 0;
+
+       cs = fdtdec_get_int(blob, node, "reg", -1);
+       max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 100000);
+       if (fdtdec_get_bool(blob, node, "spi-cpol"))
+               mode |= SPI_CPOL;
+       if (fdtdec_get_bool(blob, node, "spi-cpha"))
+               mode |= SPI_CPHA;
+       if (fdtdec_get_bool(blob, node, "spi-cs-high"))
+               mode |= SPI_CS_HIGH;
+       return spi_setup_slave(busnum, cs, max_hz, mode);
+}
+#endif