[PATCH 4.19 008/202] spi: introduce SPI_MODE_X_MASK macro

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>

[ Upstream commit 029b42d8519cef70c4fb5fcaccd08f1053ed2bf0 ]

Provide a macro to filter all SPI_MODE_0,1,2,3 mode in one run.

The latest SPI framework will parse the devicetree in following call
sequence: of_register_spi_device() -> of_spi_parse_dt()
So, driver do not need to pars the devicetree and will get prepared
flags in the probe.

On one hand it is good far most drivers. On other hand some drivers need to
filter flags provide by SPI framework and apply know to work flags. This drivers
may use SPI_MODE_X_MASK to filter MODE flags and set own, known flags:
  spi->flags &= ~SPI_MODE_X_MASK;
  spi->flags |= SPI_MODE_0;

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201027095724.18654-2-o.rempel@xxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Stable-dep-of: 6d710b769c1f ("serial: sc16is7xx: add check for unsupported SPI modes during probe")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/linux/spi/spi.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 16158fe097a8..23a232d6db69 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -153,6 +153,7 @@ struct spi_device {
 #define	SPI_MODE_1	(0|SPI_CPHA)
 #define	SPI_MODE_2	(SPI_CPOL|0)
 #define	SPI_MODE_3	(SPI_CPOL|SPI_CPHA)
+#define	SPI_MODE_X_MASK	(SPI_CPOL|SPI_CPHA)
 #define	SPI_CS_HIGH	0x04			/* chipselect active high? */
 #define	SPI_LSB_FIRST	0x08			/* per-word bits-on-wire */
 #define	SPI_3WIRE	0x10			/* SI/SO signals shared */
-- 
2.43.0







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