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| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-06-15 00:43:01 +0300 |
|---|---|---|
| committer | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-06-20 13:00:32 +0300 |
| commit | 22c040fa21b604b9b3d88645e108fb2f0a74474b (patch) | |
| tree | f03e0f4c4be98c4f1ad2f8c680ec2af9c813c9de /drivers/platform/chrome/Makefile | |
| parent | 4116fd25c5262e90427f9840e861a8553374a867 (diff) | |
| download | linux-22c040fa21b604b9b3d88645e108fb2f0a74474b.tar.xz | |
platform/chrome: cros_ec_lpc: Choose Microchip EC at runtime
On many boards, communication between the kernel and the Embedded
Controller happens over an LPC bus. In these cases, the kernel config
CONFIG_CROS_EC_LPC is enabled. Some of these LPC boards contain a
Microchip Embedded Controller (MEC) that is different from the regular
EC. On these devices, the same LPC bus is used, but the protocol is
a little different. In these cases, the CONFIG_CROS_EC_LPC_MEC kernel
config is enabled. Currently, the kernel decides at compile-time whether
or not to use the MEC variant, and, when that kernel option is selected
it breaks the other boards. We would like a kind of runtime detection to
avoid this.
This patch adds that detection mechanism by probing the protocol at
runtime, first we assume that a MEC variant is connected, and if the
protocol fails it fallbacks to the regular EC. This adds a bit of
overload because we try to read twice on those LPC boards that doesn't
contain a MEC variant, but is a better solution than having to select the
EC variant at compile-time.
While here also fix the alignment in Kconfig file for this config option
replacing the spaces by tabs.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Nick Crews <ncrews@chromium.org>
Reviewed-by: Nick Crews <ncrews@chromium.org>
Diffstat (limited to 'drivers/platform/chrome/Makefile')
| -rw-r--r-- | drivers/platform/chrome/Makefile | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile index 5a2bcef4b07c..fd0af05cc14c 100644 --- a/drivers/platform/chrome/Makefile +++ b/drivers/platform/chrome/Makefile @@ -10,8 +10,7 @@ obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o obj-$(CONFIG_CROS_EC_ISHTP) += cros_ec_ishtp.o obj-$(CONFIG_CROS_EC_RPMSG) += cros_ec_rpmsg.o obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o -cros_ec_lpcs-objs := cros_ec_lpc.o -cros_ec_lpcs-$(CONFIG_CROS_EC_LPC_MEC) += cros_ec_lpc_mec.o +cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_mec.o obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpcs.o obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o cros_ec_trace.o obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o |