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dm: i2c: allow disabling driver model in SPL

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At present if U-Boot proper uses driver model for I2C, then SPL has to
also. While this is desirable, it places a significant barrier to moving
to driver model in some cases. For example, with a space-constrained SPL
it may be necessary to enable CONFIG_SPL_OF_PLATDATA which involves
adjusting some drivers.

This patch introduces a separate Kconfig symbols for enabling DM_I2C and
DM_I2C_GPIO support in SPL.

This will also help to get away from dirty workarounds to
achieve non-DM I2C support for SPL, which is currently used in some
board header files like:

ifdef CONFIG_SPL_BUILD
undef CONFIG_DM_I2C
endif

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Igor Opaniuk 2021-02-09 13:52:43 +02:00 • committed by Heiko Schocher
parent 73c16692bc
commit d1f3abe1e7
3 changed files with 24 additions and 3 deletions
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21
drivers/i2c/Kconfig
View file

@ -14,6 +14,17 @@ config DM_I2C
device (bus child) info is kept as parent plat. The interface
is defined in include/i2c.h.
config SPL_DM_I2C
bool "Enable Driver Model for I2C drivers in SPL"
depends on SPL_DM && DM_I2C
default y
help
Enable driver model for I2C. The I2C uclass interface: probe, read,
write and speed, is implemented with the bus drivers operations,
which provide methods for bus setting and data transfer. Each chip
device (bus child) info is kept as parent platdata. The interface
is defined in include/i2c.h.
config I2C_CROS_EC_TUNNEL
tristate "Chrome OS EC tunnel I2C bus"
depends on CROS_EC
@ -61,6 +72,16 @@ config DM_I2C_GPIO
bindings are supported.
Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
config SPL_DM_I2C_GPIO
bool "Enable Driver Model for software emulated I2C bus driver in SPL"
depends on SPL_DM && DM_I2C_GPIO && SPL_DM_GPIO && SPL_GPIO_SUPPORT
default y
help
Enable the i2c bus driver emulation by using the GPIOs. The bus GPIO
configuration is given by the device tree. Kernel-style device tree
bindings are supported.
Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
config SYS_I2C_AT91
bool "Atmel I2C driver"
depends on DM_I2C && ARCH_AT91

4
drivers/i2c/Makefile
View file

@ -2,9 +2,9 @@
#
# (C) Copyright 2000-2007
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
obj-$(CONFIG_DM_I2C) += i2c-uclass.o
obj-$(CONFIG_$(SPL_)DM_I2C) += i2c-uclass.o
ifdef CONFIG_ACPIGEN
obj-$(CONFIG_DM_I2C) += acpi_i2c.o
obj-$(CONFIG_$(SPL_)DM_I2C) += acpi_i2c.o
endif
obj-$(CONFIG_$(SPL_)DM_I2C_GPIO) += i2c-gpio.o
obj-$(CONFIG_$(SPL_)I2C_CROS_EC_TUNNEL) += cros_ec_tunnel.o

2
drivers/misc/Makefile
View file

@ -17,7 +17,7 @@ obj-$(CONFIG_SANDBOX) += p2sb_sandbox.o p2sb_emul.o
obj-$(CONFIG_SANDBOX) += swap_case.o
endif
ifdef CONFIG_DM_I2C
ifdef CONFIG_$(SPL_)DM_I2C
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o
endif