i3c: Add Phytium i3c controller support

Documentation/devicetree/bindings/i3c/cdns,i3c-master.yaml

@@ -14,7 +14,9 @@ allOf:
 
 properties:
   compatible:
-    const: cdns,i3c-master
+    enum:
+      - cdns,i3c-master
+      - phytium,cdns-i3c-master
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/i3c/phytium,i3c-master.yaml

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+
+* Phytium I3C controller
+
+This I3C controller is for Phytium Soc.
+
+Required properties:
+- compatible: Shall be "phytium,cdns-i3c-master"
+- clocks: Shall reference the pclk and sysclk
+- clock-names: Shall contain "pclk" and "sysclk"
+- interrupts: The interrupt line connected to this I3C master
+- reg: I3C master registers
+- #address-cells: Shall be set to 1
+- #size-cells: Shall be set to 0
+- i2c-scl-hz: I2C CLK frequency
+- i3c-scl-hz: I3C CLK frequency
+
+Example:
+
+	i3c-master@28045000 {
+		compatible = "phytium,cdns-i3c-master";
+		reg = <0x0 0x28045000 0x0 0x1000>;
+		interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&coreclock>, <&i3csysclock>;
+		clock-names = "pclk", "sysclk";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		i2c-scl-hz = <400000>;
+		i3c-scl-hz = <1000000>;
+
+		nunchuk: nunchuk@52 {
+			compatible = "nintendo,nunchuk";
+			reg = <0x52 0x0 0x10>;
+		};
+	};

drivers/i3c/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 i3c-y				:= device.o master.o
 obj-$(CONFIG_I3C)		+= i3c.o
+i3c-$(CONFIG_ACPI)	+= i3c_master_acpi.o
 obj-$(CONFIG_I3C)		+= master/

drivers/i3c/i3c_master_acpi.c

@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for I3C ACPI Interface
+ *
+ * Copyright (C) 2021-2023 Phytium Technology Co., Ltd.
+ */
+
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include "i3c_master_acpi.h"
+
+static int i3c_master_acpi_parse_val(union acpi_object *store_elements, char *method,
+						 int count, u32 *value)
+{
+	int i, package_count, ret = -1;
+	union acpi_object *acpi_elements;
+
+	for (i = 0; i < count; i++) {
+		acpi_elements = store_elements;
+		if (acpi_elements[i].type == ACPI_TYPE_PACKAGE) {
+			package_count = acpi_elements[i].package.count;
+
+			if (package_count == 2) {
+				acpi_elements = acpi_elements[i].package.elements;
+				if (acpi_elements[0].type == ACPI_TYPE_STRING) {
+					if (!strcmp(acpi_elements[0].string.pointer, method)) {
+						*value = acpi_elements[1].integer.value;
+						ret = 0;
+						break;
+					}
+				}
+			}
+		}
+	}
+	return ret;
+}
+
+int i3c_master_acpi_get_params(acpi_handle handle, char *method, u32 *value)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	acpi_status status = 0;
+	union acpi_object *obj;
+	int count, ret = -1;
+
+	status = acpi_evaluate_object(handle, "_DSD", NULL, &buf);
+	if (ACPI_FAILURE(status)) {
+		kfree(buf.pointer);
+		return -2;
+	}
+
+	obj = (union acpi_object *)buf.pointer;
+
+	if (obj->type == ACPI_TYPE_PACKAGE) {
+		union acpi_object *acpi_elements;
+		union acpi_object *store_elements;
+
+		acpi_elements = obj->package.elements;
+		if ((obj->package.count >= 2) && (acpi_elements[1].type == ACPI_TYPE_PACKAGE)) {
+			count = acpi_elements[1].package.count;
+			acpi_elements = acpi_elements[1].package.elements;
+
+			store_elements = acpi_elements;
+			ret = i3c_master_acpi_parse_val(store_elements, method, count, value);
+		}
+	}
+
+	kfree(buf.pointer);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(i3c_master_acpi_get_params);
+
+void i3c_master_acpi_clk_params(acpi_handle handle, char *method,
+				    u32 *pres_ctrl0, u32 *pres_ctrl1, u32 *thd_delay)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	union acpi_object *obj;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
+		return;
+
+	obj = (union acpi_object *)buf.pointer;
+	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
+		const union acpi_object *objs = obj->package.elements;
+
+	*pres_ctrl0 = (u32)objs[0].integer.value;
+	*pres_ctrl1 = (u32)objs[1].integer.value;
+	*thd_delay = (u32)objs[2].integer.value;
+	}
+
+	kfree(buf.pointer);
+}
+EXPORT_SYMBOL_GPL(i3c_master_acpi_clk_params);

drivers/i3c/i3c_master_acpi.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Driver for I3C ACPI Interface
+ *
+ * Copyright (C) 2021-2023 Phytium Technology Co., Ltd.
+ */
+
+#ifndef __I3C_MASTER_ACPI_H
+#define __I3C_MASTER_ACPI_H
+
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+
+int i3c_master_acpi_get_params(acpi_handle handle, char *method, u32 *value);
+void i3c_master_acpi_clk_params(acpi_handle handle, char *method,
+	   u32 *pres_ctrl0, u32 *pres_ctrl1, u32 *thd_delay);
+
+#endif