usbc: add generic TCPCI related functions

Add generic functions that will be common to all TCPCI compliant
drivers like registers reading, writing and updating.

Signed-off-by: Michał Barnaś <[email protected]>

Author: barnas-michal

drivers/usb_c/tcpc/CMakeLists.txt

@@ -5,3 +5,4 @@ zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_USBC_TCPC_SHELL shell.c)
 zephyr_library_sources_ifdef(CONFIG_USBC_TCPC_STM32 ucpd_stm32.c)
 zephyr_library_sources_ifdef(CONFIG_USBC_TCPC_NUMAKER ucpd_numaker.c)
+zephyr_library_sources_ifdef(CONFIG_USBC_TCPC_TCPCI tcpci.c)

drivers/usb_c/tcpc/Kconfig

@@ -27,6 +27,7 @@ config USBC_TCPC_SHELL
 
 source "drivers/usb_c/tcpc/Kconfig.tcpc_stm32"
 source "drivers/usb_c/tcpc/Kconfig.tcpc_numaker"
+source "drivers/usb_c/tcpc/Kconfig.tcpc_tcpci"
 
 module = USBC
 module-str = usbc

drivers/usb_c/tcpc/Kconfig.tcpc_tcpci

@@ -0,0 +1,25 @@
+# USB-C TCPCI-compliant devices configuration options
+
+# Copyright 2024 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+config USBC_TCPC_TCPCI
+	bool
+	select I2C
+	help
+	  Enable support for Type-C Port Controller Interface.
+	  This symbol should be selected by TCPCI-compliant drivers to allow the use of generic
+	  TCPCI functions for registers operations.
+
+if USBC_TCPC_TCPCI
+
+config USBC_TCPC_TCPCI_I2C_RETRIES
+	int "I2C communication retries"
+	default 2
+	help
+	  Number of I2C transaction tries that will be performed for each request.
+	  Some TCPCs are going into deep sleep mode when no charger is connected and won't respond
+	  to the i2c address immediately. If device won't respond after retries, it means that
+	  it is not responsible or is not connected.
+
+endif