From c7252e2d146c0cbdb5e52ff56db30d62353196d5 Mon Sep 17 00:00:00 2001
From: msp-ti <msp-opensource@list.ti.com>
Date: Mon, 18 Mar 2024 16:08:25 -0400
Subject: [PATCH] initial work on SMBUS

---
 drivers/smbus/smbus_mspm0.c            | 84 ++++++++++++++++++++++++++
 dts/arm/ti/mspm0g3xxx.dtsi             | 12 ++++
 dts/arm/ti/mspm0l2xxx.dtsi             | 12 ++++
 dts/bindings/smbus/ti,mspm0-smbus.yaml | 17 ++++++
 4 files changed, 125 insertions(+)
 create mode 100644 drivers/smbus/smbus_mspm0.c
 create mode 100644 dts/bindings/smbus/ti,mspm0-smbus.yaml

diff --git a/drivers/smbus/smbus_mspm0.c b/drivers/smbus/smbus_mspm0.c
new file mode 100644
index 000000000000000..4220fe27ec34a5b
--- /dev/null
+++ b/drivers/smbus/smbus_mspm0.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2024 Texas Instruments
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT ti_mspm0_smbus
+
+/* Zephyr Includes */
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/smbus.h>
+#include <zephyr/drivers/i2c.h>
+#include <zephyr/drivers/pinctrl.h>
+#include <soc.h>
+
+struct smbus_mspm0_config {
+    uint32_t base;
+};
+
+struct smbus_mspm0_data {
+    uint32_t value;
+};
+
+static void smbus_mspm0_init(const struct device *dev) {
+    i2c_mspm0_init(dev);
+}
+
+static int smbus_mspm0_configure(const struct device *dev, uint32_t dev_config){
+
+}
+
+static int smbus_mspm0_get_config(const struct device *dev, uint32_t * dev_config){
+
+}
+
+static int smbus_mspm0_quick(const struct device *dev, uint16_t addr, enum smbus_direction direction){
+    
+}
+
+static const struct smbus_driver_api smbus_mspm0_driver_api = {
+    .xfer_stats = //
+	.configure = smbus_mspm0_configure,
+	.get_config = smbus_mspm0_get_config,
+    .smbalert_set_cb = //
+    .smbalert_remove_cb = //
+    .host_notify_set = //
+    .host_notify_remove_cb = //
+    .quick = smbus_mspm0_quick,
+    .byte_write = //
+    .byte_read = //
+    .byte_data_write = //
+    .byte_data_read = //
+    .word_data_write = //
+    .word_data_read = //
+    .pcall = //
+    .block_write = //
+    .block_read = //
+    .block_pcall = //
+	// add target stuff next
+};
+
+
+#define MSP_SMBUS_INIT_FN(index)                                                                     \
+                                                                                                   \
+	PINCTRL_DT_INST_DEFINE(index);                                                             \
+                                                                                                   \                                              \
+                                                                                                   \
+	static const struct i2c_mspm0_config i2c_mspm0_cfg_##index = {                   \
+		.base = DT_INST_REG_ADDR(index),                                                   \
+		.clock_frequency = DT_INST_PROP(index, clock_frequency),                           \
+		.pinctrl = PINCTRL_DT_INST_DEV_CONFIG_GET(index),                                  \
+		.interrupt_init_function = i2c_mspm0_interrupt_init_##index,                  \
+		.gI2CClockConfig = {.clockSel = DL_I2C_CLOCK_BUSCLK,                               \
+				    .divideRatio = DL_I2C_CLOCK_DIVIDE_1}};                        \
+                                                                                                   \
+	static struct i2c_mspm0_data i2c_mspm0_data_##index;                             \
+                                                                                                   \
+	I2C_DEVICE_DT_INST_DEFINE(index, i2c_mspm0_init, NULL, &i2c_mspm0_data_##index,  \
+				  &i2c_mspm0_cfg_##index, POST_KERNEL,                        \
+				  CONFIG_I2C_INIT_PRIORITY, &i2c_mspm0_driver_api);           \
+                                                                                                   \
+	INTERRUPT_INIT_FUNCTION(index)
+
+DT_INST_FOREACH_STATUS_OKAY(MSP_SMBUS_INIT_FN)
\ No newline at end of file
diff --git a/dts/arm/ti/mspm0g3xxx.dtsi b/dts/arm/ti/mspm0g3xxx.dtsi
index 1161528ea39ab12..92d54db137687f5 100644
--- a/dts/arm/ti/mspm0g3xxx.dtsi
+++ b/dts/arm/ti/mspm0g3xxx.dtsi
@@ -142,6 +142,18 @@
 		};
 
 	};
+
+	smbus0: smbus0 {
+		compatible = "ti,mspm0-smbus";
+		i2c = <&i2c0>;
+		status = "disabled";
+	};
+
+	smbus1: smbus1 {
+		compatible = "ti,mspm0-smbus";
+		i2c = <&i2c1>;
+		status = "disabled";
+	};
 };
 
 &nvic {
diff --git a/dts/arm/ti/mspm0l2xxx.dtsi b/dts/arm/ti/mspm0l2xxx.dtsi
index 086ae7b3f115077..54272438756876d 100644
--- a/dts/arm/ti/mspm0l2xxx.dtsi
+++ b/dts/arm/ti/mspm0l2xxx.dtsi
@@ -122,6 +122,18 @@
 			ti,watchdog-reset-action = <1>;
 		};
 	};
+
+	smbus0: smbus0 {
+		compatible = "ti,mspm0-smbus";
+		i2c = <&i2c0>;
+		status = "disabled";
+	};
+
+	smbus1: smbus1 {
+		compatible = "ti,mspm0-smbus";
+		i2c = <&i2c1>;
+		status = "disabled";
+	};
 };
 
 &nvic {
diff --git a/dts/bindings/smbus/ti,mspm0-smbus.yaml b/dts/bindings/smbus/ti,mspm0-smbus.yaml
new file mode 100644
index 000000000000000..1ee5607dafec5b4
--- /dev/null
+++ b/dts/bindings/smbus/ti,mspm0-smbus.yaml
@@ -0,0 +1,17 @@
+# Copyright (c) 2024 Texas Instruments
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+    TI MSPM0 SMBUS implementation, put on top of a
+    capable I2C peripheral in order to follow the SMBUS protocol as either
+    a controller or a target
+
+compatible: "ti,mspm0-smbus"
+
+include: base.yaml
+
+properties: 
+  i2c: 
+    type: phandle
+    required: true
+    description: The underlying I2C instance
\ No newline at end of file