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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> |
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| .. | ||
| wilco_ec | ||
| chromeos_laptop.c | ||
| chromeos_pstore.c | ||
| chromeos_tbmc.c | ||
| cros_ec_debugfs.c | ||
| cros_ec_i2c.c | ||
| cros_ec_ishtp.c | ||
| cros_ec_lightbar.c | ||
| cros_ec_lpc_mec.c | ||
| cros_ec_lpc_mec.h | ||
| cros_ec_lpc.c | ||
| cros_ec_proto.c | ||
| cros_ec_rpmsg.c | ||
| cros_ec_spi.c | ||
| cros_ec_sysfs.c | ||
| cros_ec_trace.c | ||
| cros_ec_trace.h | ||
| cros_ec_vbc.c | ||
| cros_kbd_led_backlight.c | ||
| cros_usbpd_logger.c | ||
| Kconfig | ||
| Makefile | ||