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Message-ID: <20250102204015.222653-3-ivo.ivanov.ivanov1@gmail.com>
Date: Thu, 2 Jan 2025 22:40:14 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Sam Protsenko <semen.protsenko@...aro.org>
Cc: devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/3] dt-bindings: soc: samsung: usi: add USIv1 and samsung,exynos8895-usi
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@...il.com>
---
.../bindings/soc/samsung/exynos-usi.yaml | 22 ++++++++++++++-----
include/dt-bindings/soc/samsung,exynos-usi.h | 8 +++++++
2 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
index f80fcbc31..50db63a8a 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@...nel.org>
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
@@ -106,6 +117,7 @@ if:
contains:
enum:
- samsung,exynos850-usi
+ - samsung,exynos8895-usi
then:
properties:
diff --git a/include/dt-bindings/soc/samsung,exynos-usi.h b/include/dt-bindings/soc/samsung,exynos-usi.h
index a01af169d..5fbeb426b 100644
--- a/include/dt-bindings/soc/samsung,exynos-usi.h
+++ b/include/dt-bindings/soc/samsung,exynos-usi.h
@@ -9,6 +9,14 @@
#ifndef __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H
#define __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H
+#define USI_V1_NONE 0
+#define USI_V1_I2C0 1
+#define USI_V1_I2C1 2
+#define USI_V1_I2C0_1 3
+#define USI_V1_SPI 4
+#define USI_V1_UART 5
+#define USI_V1_UART_I2C1 6
+
#define USI_V2_NONE 0
#define USI_V2_UART 1
#define USI_V2_SPI 2
--
2.43.0
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