diff options
| author | Simon Glass <sjg@chromium.org> | 2021-07-10 21:14:35 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-07-28 14:29:37 -0400 |
| commit | 59e11ebf841454a0991731f1ee6ae4eafd9cb235 (patch) | |
| tree | d5c05a5f67669912c31a9522d45a833c979315dd | |
| parent | 6f7abf64508b329c8b1d642d002ac950aee68f88 (diff) | |
| download | u-boot-59e11ebf841454a0991731f1ee6ae4eafd9cb235.tar.gz | |
i2c: Create a new Kconfig for I2C
At present we have CONFIG_SPL_I2C but not CONFIG_I2C. The reason
CONFIG_I2C is not strictly necessary is that:
a) We have CONFIG_SYS_I2C_LEGACY and CONFIG_DM_I2C for the two possible
i2c stacks
b) In U-Boot proper, we always build drivers/i2c/ regardless of the
options
Still, it is better to have CONFIG_I2C - it makes U-Boot proper similar to
SPL/TPL, so we can (in a future commit) simplify the Makefile rules.
Enable it by default, since as above, we have separate options
(SYS_I2C_LEGACY and DM_I2C) to control whether it is 'really' enabled.
Once we have migrated I2C to driver model, we can drop SYS_I2C_LEGACY and
make DM_I2C become I2C. For now, this lets us simplify the Makefile rules.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
| -rw-r--r-- | drivers/i2c/Kconfig | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index d6d2b67b8e..63d03a3ceb 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -2,7 +2,29 @@ # I2C subsystem configuration # -menu "I2C support" +menuconfig I2C + bool "I2C support" + default y + help + Note: + This is a stand-in for an option to enable I2C support. In fact this + simply enables building of the I2C directory for U-Boot. The actual + I2C feature is enabled by DM_I2C (for driver model) and + the #define CONFIG_SYS_I2C_LEGACY (for the legacy I2C stack). + + So at present there is no need to ever disable this option. + + Eventually it will: + + Enable support for the I2C (Inter-Integrated Circuit) bus in U-Boot. + I2C works with a clock and data line which can be driven by a + one or more masters or slaves. It is a fairly complex bus but is + widely used as it only needs two lines for communication. Speeds of + 400kbps are typical but up to 3.4Mbps is supported by some + hardware. Enable this option to build the drivers in drivers/i2c as + part of a U-Boot build. + +if I2C config DM_I2C bool "Enable Driver Model for I2C drivers" @@ -528,4 +550,4 @@ config SYS_I2C_IHS source "drivers/i2c/muxes/Kconfig" -endmenu +endif |