drivers: i2c: Base OMAP I2C support for TI-K3 processor

The OMAP I2C provides support for I2C serial interface on TI K3 series.
It is compatible with Philips I2C physical layer.
The commit includes:
Zephyr i2c api implementation

Signed-off-by: Dhruv Menon <[email protected]>

boards/beagle/beaglebone_ai64/beaglebone_ai64_j721e_main_r5f0_0.dts

@@ -0,0 +1,84 @@
+/* Copyright (C) 2023 BeagleBoard.org Foundation
+ * Copyright (C) 2023 S Prashanth
+ * Copyright (c) 2024 Texas Instruments Incorporated
+ *	Andrew Davis <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <ti/j721e_main_r5.dtsi>
+#include <zephyr/dt-bindings/pinctrl/ti-k3-pinctrl.h>
+#include <freq.h>
+
+/ {
+	model = "BeagleBone-AI64";
+	compatible = "beagle,beaglebone-ai64";
+
+	chosen {
+		zephyr,sram = &ddr1;
+		zephyr,console = &uart2;
+		zephyr,shell-uart = &uart2;
+	};
+
+	cpus {
+		cpu@0 {
+			status = "okay";
+		};
+	};
+
+	ddr0: memory@a2000000 {
+		compatible = "mmio-sram";
+		reg = <0xa2000000 DT_SIZE_M(1)>;
+	};
+
+	rsc_table: memory@a2100000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0xa2100000 DT_SIZE_M(1)>;
+		zephyr,memory-region = "RSC_TABLE";
+	};
+
+	ddr1: memory@a2200000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0xa2200000 DT_SIZE_M(14)>;
+		zephyr,memory-region = "DRAM";
+	};
+};
+
+&i2c6 {
+	status = "okay";
+	pinctrl-0 = <&i2c6_scl_default &i2c6_sda_default>;
+	pinctrl-names = "default";
+};
+
+&uart2 {
+	status = "okay";
+	pinctrl-0 = <&uart2_tx_default &uart2_rx_default>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+};
+
+&systick_timer {
+	status = "okay";
+};
+
+&pinctrl {
+	uart2_tx_default: uart2_tx_default {
+		/* 0x1c is address of padconfig register of p8.34 and 14 is mux mode */
+		pinmux = <K3_PINMUX(0x1c, PIN_OUTPUT, MUX_MODE_14)>;
+	};
+
+	uart2_rx_default: uart2_rx_default {
+		/* 0x14 is address of padconfig register of p8.22 and 14 is mux mode */
+		pinmux = <K3_PINMUX(0x14, PIN_INPUT, MUX_MODE_14)>;
+	};
+	i2c6_scl_default: i2c6_scl_default {
+		/* 0x1e0 is the address of padconfig register of p9.17 and 2 is mux mode */
+		pinmux = <K3_PINMUX(0x1d0, PIN_INPUT_PULLUP, MUX_MODE_2)>;
+	};
+	i2c6_sda_default: i2c6_sda_default {
+		/* 0x1dc is the address of padconfig register of p9.18 and 2 is mux mode */
+		pinmux = <K3_PINMUX(0x1e4, PIN_INPUT_PULLUP, MUX_MODE_2)>;
+	};
+};

drivers/i2c/CMakeLists.txt

@@ -66,6 +66,7 @@ zephyr_library_sources_ifdef(CONFIG_I2C_LITEX		i2c_litex.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_NPCX		i2c_npcx_controller.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_NPCX		i2c_npcx_port.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_DW		i2c_dw.c)
+zephyr_library_sources_ifdef(CONFIG_I2C_OMAP		i2c_omap.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_RCAR		i2c_rcar.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_TCA954X		i2c_tca954x.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_XEC_V2		i2c_mchp_xec_v2.c)

drivers/i2c/Kconfig

@@ -122,6 +122,7 @@ source "drivers/i2c/Kconfig.litex"
 source "drivers/i2c/Kconfig.lpc11u6x"
 source "drivers/i2c/Kconfig.npcx"
 source "drivers/i2c/Kconfig.test"
+source "drivers/i2c/Kconfig.omap"
 source "drivers/i2c/Kconfig.rcar"
 source "drivers/i2c/Kconfig.renesas_ra"
 source "drivers/i2c/Kconfig.tca954x"

drivers/i2c/Kconfig.omap

@@ -0,0 +1,26 @@
+# Copyright (C) 2024 BeagleBoard.org Foundation
+# Copyright (C) 2024 Dhruv Menon <[email protected]>
+
+# SPDX-License-Identifier: Apache-2.0
+
+config I2C_OMAP
+	bool "TI OMAP I2C Driver"
+	default y
+	depends on DT_HAS_TI_OMAP_I2C_ENABLED
+	select I2C_BITBANG
+	help
+		Enable the I2C driver for TI OMAP SoCs.
+
+menu "Custom I2C OMAP Logging"
+config OMAP_I2C_LOG_LEVEL
+	int "OMAP I2C Log Level"
+	default   # For DEBUG level
+	range 0 4
+	help
+		Set the log level for the OMAP I2C module:
+		0: None
+		1: Error
+		2: Warning
+		3: Info
+		4: Debug
+endmenu