i2c: SAM Add RTIO support for I2C

Support i2c with a seperate driver for sam twihs that implements RTIO.

Signed-off-by: Tom Burdick <[email protected]>

Author: teburd

drivers/i2c/CMakeLists.txt

@@ -3,6 +3,11 @@
 zephyr_library()
 
 zephyr_library_sources(i2c_common.c)
+
+if(CONFIG_I2C_RTIO)
+zephyr_library_sources(i2c_rtio.c)
+zephyr_library_sources_ifdef(CONFIG_I2C_SAM_TWIHS    i2c_sam_twihs_rtio.c)
+else()
 zephyr_library_sources_ifdef(CONFIG_I2C_SHELL		i2c_shell.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_BITBANG		i2c_bitbang.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_TELINK_B91		i2c_b91.c)
@@ -52,10 +57,10 @@ zephyr_library_sources_ifdef(CONFIG_I2C_STM32_V2
 	i2c_ll_stm32_v2.c
 	i2c_ll_stm32.c
 	)
+endif()
 
 zephyr_library_sources_ifdef(CONFIG_I2C_TEST		i2c_test.c)
 
-zephyr_library_sources_ifdef(CONFIG_I2C_RTIO		i2c_rtio.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE		i2c_handlers.c)
 
 add_subdirectory_ifdef(CONFIG_I2C_TARGET target)

drivers/i2c/Kconfig

@@ -40,6 +40,11 @@ config I2C_CALLBACK
 	help
 	  API and implementations of i2c_transfer_cb.
 
+config I2C_RTIO
+	bool "I2C RTIO API"
+	help
+	  API and implementations of I2C for RTIO
+
 # Include these first so that any properties (e.g. defaults) below can be
 # overridden (by defining symbols in multiple locations)
 source "drivers/i2c/Kconfig.b91"
@@ -56,6 +61,7 @@ source "drivers/i2c/Kconfig.sbcon"
 source "drivers/i2c/Kconfig.sifive"
 source "drivers/i2c/Kconfig.stm32"
 source "drivers/i2c/Kconfig.sam0"
+source "drivers/i2c/Kconfig.sam_twihs"
 source "drivers/i2c/Kconfig.litex"
 source "drivers/i2c/Kconfig.lpc11u6x"
 source "drivers/i2c/Kconfig.npcx"
@@ -88,13 +94,6 @@ config I2C_GECKO
 	help
 	  Enable the SiLabs Gecko I2C bus driver.
 
-config I2C_SAM_TWIHS
-	bool "Atmel SAM (TWIHS) I2C driver"
-	default y
-	depends on DT_HAS_ATMEL_SAM_I2C_TWIHS_ENABLED
-	help
-	  Enable Atmel SAM MCU Family (TWIHS) I2C bus driver.
-
 config I2C_SAM_TWIM
 	bool "Atmel SAM (TWIM) I2C driver"
 	default y

drivers/i2c/Kconfig.sam_twihs

@@ -0,0 +1,37 @@
+# sam twihs I2C support
+
+# Copyright (c) 2023 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig I2C_SAM_TWIHS
+	bool "Atmel SAM (TWIHS) I2C driver"
+	default y
+	depends on DT_HAS_ATMEL_SAM_I2C_TWIHS_ENABLED
+	help
+	  Enable Atmel SAM MCU Family (TWIHS) I2C bus driver.
+
+if I2C_SAM_TWIHS
+if I2C_RTIO
+
+config I2C_SAM_TWIHS_SQ_SIZE
+	int "Submission queue size for blocking calls"
+	default 4
+	help
+	  Blocking i2c calls when I2C_RTIO is enabled are copied into a per driver
+	  submission queue. The queue depth determines the number of possible i2c_msg
+	  structs that may be in the array given to i2c_transfer. A sensible default
+	  is going to be 4 given the device address, register address, and a value
+	  to be read or written.
+
+config I2C_SAM_TWIHS_CQ_SIZE
+	int "Completion queue size for blocking calls"
+	default 4
+	help
+	  Blocking i2c calls when I2C_RTIO is enabled are copied into a per driver
+	  submission queue. The queue depth determines the number of possible i2c_msg
+	  structs that may be in the array given to i2c_transfer. A sensible default
+	  is going to be 4 given the device address, register address, and a value
+	  to be read or written.
+
+endif # I2C_RTIO
+endif # I2C_SAM_TWIHS