dts: bindings: spi: add support to set CPOL, CPHA, and HOLD_CS in dts file (eb2f5ceb) · Commits · Wenxi XU / zephyr

Add support to set SPI clock polarity (CPOL), clock phase (CPHA), and hold-on-cs in a dts file to get rid of using related macros in spi.c driver since each board may work on a different SPI mode rather than the default one (based on CPOL and CPHA). Signed-off-by:

Ali Hozhabri <ali.hozhabri@st.com>

dts/bindings/spi/spi-device.yaml

+18 −0

Original line number	Diff line number	Diff line
		@@ -40,3 +40,21 @@ properties:
		enum:
		- 0
		- 32768
		spi-cpol:
		type: boolean
		description: \|
		SPI clock polarity which indicates the clock idle state.
		If it is used, the clock idle state is logic high; otherwise, low.
		spi-cpha:
		type: boolean
		description: \|
		SPI clock phase that indicates on which edge data is sampled.
		If it is used, data is sampled on the second edge; otherwise, on the first edge.
		spi-hold-cs:
		type: boolean
		description: \|
		In some cases, it is necessary for the master to manage SPI chip select
		under software control, so that multiple spi transactions can be performed
		without releasing it. A typical use case is variable length SPI packets
		where the first spi transaction reads the length and the second spi transaction
		reads length bytes.

Admin message