Add constants for choosing USIv1 configuration mode in device tree.
Those are further used in the USI driver to figure out which value to
write into SW_CONF register. Modify the current USI IP-core
bindings to include information about USIv1 and a compatible for
exynos8895.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@xxxxxxxxx>
---
.../bindings/soc/samsung/exynos-usi.yaml | 55 +++++++++++++++----
include/dt-bindings/soc/samsung,exynos-usi.h | 7 +++
2 files changed, 50 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
index 5b046932f..6e32daa45 100644
--- a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
+++ b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
@@ -11,11 +11,21 @@ maintainers:
- Krzysztof Kozlowski <krzk@xxxxxxxxxx>
description: |
- USI IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C).
- USI shares almost all internal circuits within each protocol, so only one
- protocol can be chosen at a time. USI is modeled as a node with zero or more
- child nodes, each representing a serial sub-node device. The mode setting
- selects which particular function will be used.
+ The USI IP-core provides configurable support for serial protocols, enabling
+ different serial communication modes depending on the version.
+
+ In USIv1, configurations are available to enable either one or two protocols
+ simultaneously in select combinations - High-Speed I2C0, High-Speed
+ I2C1, SPI, UART, High-Speed I2C0 and I2C1 or both High-Speed
+ I2C1 and UART.
+
+ In USIv2, only one protocol can be active at a time, either UART, SPI, or
+ High-Speed I2C.
+
+ The USI core shares internal circuits across protocols, meaning only the
+ selected configuration is active at any given time. USI is modeled as a node
+ with zero or more child nodes, each representing a serial sub-node device. The
+ mode setting selects which particular function will be used.
properties:
$nodename:
@@ -31,6 +41,7 @@ properties:
- const: samsung,exynos850-usi
- enum:
- samsung,exynos850-usi
+ - samsung,exynos8895-usi
reg:
maxItems: 1
@@ -64,7 +75,6 @@ properties:
samsung,mode:
$ref: /schemas/types.yaml#/definitions/uint32
- enum: [0, 1, 2, 3]
description:
Selects USI function (which serial protocol to use). Refer to
<include/dt-bindings/soc/samsung,exynos-usi.h> for valid USI mode values.
@@ -101,18 +111,42 @@ required:
- samsung,sysreg
- samsung,mode
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - samsung,exynos850-usi
+ then:
+ properties:
+ reg:
+ maxItems: 1
+
+ samsung,mode:
+ enum: [0, 1, 2, 3]
+
+ required:
+ - reg
+
+ else:
+ properties:
+ reg: false
+ samsung,clkreq-on: false
+
+ samsung,mode:
+ enum: [4, 5, 6, 7, 8, 9, 10]
+
if:
properties:
compatible:
contains:
enum:
- samsung,exynos850-usi
+ - samsung,exynos8895-usi
then:
properties:
- reg:
- maxItems: 1
-
clocks:
items:
- description: Bus (APB) clock
@@ -122,16 +156,13 @@ then:
maxItems: 2
required:
- - reg
- clocks
- clock-names
else:
properties:
- reg: false
clocks: false
clock-names: false
- samsung,clkreq-on: false
additionalProperties: false
diff --git a/include/dt-bindings/soc/samsung,exynos-usi.h b/include/dt-bindings/soc/samsung,exynos-usi.h
index a01af169d..4c077c9a8 100644
--- a/include/dt-bindings/soc/samsung,exynos-usi.h
+++ b/include/dt-bindings/soc/samsung,exynos-usi.h
@@ -13,5 +13,12 @@
#define USI_V2_UART 1
#define USI_V2_SPI 2
#define USI_V2_I2C 3
+#define USI_V1_NONE 4
+#define USI_V1_I2C0 5
+#define USI_V1_I2C1 6
+#define USI_V1_I2C0_1 7
+#define USI_V1_SPI 8
+#define USI_V1_UART 9
+#define USI_V1_UART_I2C1 10
#endif /* __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H */
--
2.43.0
