[PATCH] spi/fsl-espi: Add missing cell-index OF property

[Joakim Tjernlund]

espi does not look for a OF cell-index property which
makes the bus numbering dynamic only. This add an
optional cell-index.

Signed-off-by: Joakim Tjernlund <joakim.tjernlund at infinera.com>
---
 drivers/spi/spi-fsl-espi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 1d332e23f6ed..56b71c5e2f10 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -672,6 +672,14 @@ static int fsl_espi_probe(struct device *dev, struct resource *mem,
 
 	dev_set_drvdata(dev, master);
 
+	if (dev->of_node) {
+		u32 cell_index;
+
+		if (!of_property_read_u32(dev->of_node, "cell-index",
+					  &cell_index))
+			master->bus_num = cell_index;
+	}
+
 	master->mode_bits = SPI_RX_DUAL | SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
 			    SPI_LSB_FIRST | SPI_LOOP;
 	master->dev.of_node = dev->of_node;
-- 
2.13.6