diff options
Diffstat (limited to 'drivers/spi/spi-dw-core.c')
| -rw-r--r-- | drivers/spi/spi-dw-core.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 722b5eb1f709..ddfdb903047a 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -835,6 +835,20 @@ static void dw_spi_hw_init(struct device *dev, struct dw_spi *dws) } /* + * Try to detect the number of native chip-selects if the platform + * driver didn't set it up. There can be up to 16 lines configured. + */ + if (!dws->num_cs) { + u32 ser; + + dw_writel(dws, DW_SPI_SER, 0xffff); + ser = dw_readl(dws, DW_SPI_SER); + dw_writel(dws, DW_SPI_SER, 0); + + dws->num_cs = hweight16(ser); + } + + /* * Try to detect the FIFO depth if not set by interface driver, * the depth could be from 2 to 256 from HW spec */ |