This property is used to enable and configure stm32h7 SPI controller to
handle underrun that could appear in slave mode.
Signed-off-by: Valentin Caron <valentin.caron@xxxxxxxxxxx>
---
.../devicetree/bindings/spi/st,stm32-spi.yaml | 8 ++++++++
MAINTAINERS | 1 +
include/dt-bindings/spi/spi-stm32.h | 15 +++++++++++++++
3 files changed, 24 insertions(+)
create mode 100644 include/dt-bindings/spi/spi-stm32.h
diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
index 1d26fa2658c5..e946ea71a247 100644
--- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
+++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
@@ -28,6 +28,7 @@ allOf:
properties:
st,spi-midi-ns: false
spi-slave: false
+ st,spi-slave-underrun: false
properties:
"#address-cells": true
@@ -70,6 +71,13 @@ properties:
In case of spi-slave defined, if <0>, indicate that SS should be
detected via the dedicated HW pin
+ st,spi-slave-underrun:
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ description:
+ First parameter enables and selects slave underrun reaction.
+ Refer to "dt-bindings/spi/spi-stm32.h" for the supported values.
+ Second parameter is the pattern in case of SPI_SEND_PATTERN mode.
+
patternProperties:
"^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
type: object
diff --git a/MAINTAINERS b/MAINTAINERS
index 007a9cdb9cc8..9dcf861834fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19790,6 +19790,7 @@ M: Alain Volmat <alain.volmat@xxxxxxxxxxx>
L: linux-spi@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/spi/spi-stm32.c
+F: include/dt-bindings/spi/spi-stm32.h
ST STPDDC60 DRIVER
M: Daniel Nilsson <daniel.nilsson@xxxxxxxx>
diff --git a/include/dt-bindings/spi/spi-stm32.h b/include/dt-bindings/spi/spi-stm32.h
new file mode 100644
index 000000000000..260109fd1631
--- /dev/null
+++ b/include/dt-bindings/spi/spi-stm32.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause) */
+/*
+ * This header provides constants for STM32_SPI bindings.
+ */
+
+#ifndef _DT_BINDINGS_SPI_SPI_STM32_H
+#define _DT_BINDINGS_SPI_SPI_STM32_H
+
+/* st,spi-slave-underrun first parameter */
+#define SPI_NO_ACTION 0
+#define SPI_SEND_PATTERN 1
+#define SPI_REPEAT_LAST_RECEIVED_DATA 2
+#define SPI_REPEAT_LAST_TRANSMITTED_DATA 3
+
+#endif
--
2.25.1
