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[v2,1/2] spi: introduce SPI_MODE_X_MASK macro

Message ID 20201027095724.18654-2-o.rempel@pengutronix.de
State New
Headers show
Series SPI/ Input: ads7846: properly handle spi->mode flags | expand

Commit Message

Oleksij Rempel Oct. 27, 2020, 9:57 a.m. UTC
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@pengutronix.de>
 include/linux/spi/spi.h | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 99380c0825db..8097f27702f3 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -171,6 +171,7 @@  struct spi_device {
 #define	SPI_MODE_1	(0|SPI_CPHA)
 #define	SPI_MODE_2	(SPI_CPOL|0)
 #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 */