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authorTalel Shenhar <talel@amazon.com>2018-10-11 13:20:07 +0200
committerMark Brown <broonie@kernel.org>2018-10-11 16:11:04 +0200
commitf2d704794864a4bb486f2a0eaed40f25dd87303f (patch)
tree9b0b39d17cd6cec53a7e3196b025a2668cf1abe7 /drivers/spi/spi-dw.h
parentspi: dw: add compatible for Amazon's Alpine spi controller (diff)
downloadlinux-f2d704794864a4bb486f2a0eaed40f25dd87303f.tar.xz
linux-f2d704794864a4bb486f2a0eaed40f25dd87303f.zip
dw: spi: add support for Amazon's Alpine spi controller
Add support for a new devicetree compatible string called 'amazon,alpine-apb-ssi', which is necessary for the Amazon Alpine spi controller. 'amazon,alpine-dw-apb-ssi' is used in the dw spi driver if specified in the devicetree. Otherwise, fall back to driver default behavior, i.e. original dw IP hw driver behavior. Signed-off-by: Talel Shenhar <talel@amazon.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-dw.h')
-rw-r--r--drivers/spi/spi-dw.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 0168b08364d5..c9c15881e982 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -32,6 +32,7 @@
#define DW_SPI_IDR 0x58
#define DW_SPI_VERSION 0x5c
#define DW_SPI_DR 0x60
+#define DW_SPI_CS_OVERRIDE 0xf4
/* Bit fields in CTRLR0 */
#define SPI_DFS_OFFSET 0
@@ -109,6 +110,7 @@ struct dw_spi {
u32 fifo_len; /* depth of the FIFO buffer */
u32 max_freq; /* max bus freq supported */
+ int cs_override;
u32 reg_io_width; /* DR I/O width in bytes */
u16 bus_num;
u16 num_cs; /* supported slave numbers */