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[v3,02/29] spi: Add SPI mode enums

Message ID 20200330171226.v3.2.I83a459a3914c56ca81dcdfa7e01d83c54f7ab914@changeid
State Superseded
Delegated to: Bin Meng
Headers show
Series dm: Add programmatic generation of ACPI tables (part A) | expand

Commit Message

Simon Glass March 30, 2020, 11:12 p.m. UTC 
With ACPI we need to describe the settings of the SPI bus. Add enums to
handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
---

Changes in v3: None
Changes in v2:
- Add trailing commas to enum
- Don't bracket the definitions with DM_SPI

 include/spi.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
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Patch

diff --git a/include/spi.h b/include/spi.h
index 852f570eaa8..2b4929fc79d 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -66,6 +66,39 @@  struct dm_spi_slave_platdata {
 
 #endif /* CONFIG_DM_SPI */
 
+/**
+ * enum spi_clock_phase - indicates  the clock phase to use for SPI (CPHA)
+ *
+ * @SPI_CLOCK_PHASE_FIRST: Data sampled on the first phase
+ * @SPI_CLOCK_PHASE_SECOND: Data sampled on the second phase
+ */
+enum spi_clock_phase {
+	SPI_CLOCK_PHASE_FIRST,
+	SPI_CLOCK_PHASE_SECOND,
+};
+
+/**
+ * enum spi_wire_mode - indicates the number of wires used for SPI
+ *
+ * @SPI_4_WIRE_MODE: Normal bidirectional mode with MOSI and MISO
+ * @SPI_3_WIRE_MODE: Unidirectional version with a single data line SISO
+ */
+enum spi_wire_mode {
+	SPI_4_WIRE_MODE,
+	SPI_3_WIRE_MODE,
+};
+
+/**
+ * enum spi_polarity - indicates the polarity of the SPI bus (CPOL)
+ *
+ * @SPI_POLARITY_LOW: Clock is low in idle state
+ * @SPI_POLARITY_HIGH: Clock is high in idle state
+ */
+enum spi_polarity {
+	SPI_POLARITY_LOW,
+	SPI_POLARITY_HIGH,
+};
+
 /**
  * struct spi_slave - Representation of a SPI slave
  *