From 554e937ec8d75930bc711612208af27961e3dc61 Mon Sep 17 00:00:00 2001 From: Pi-Hsun Shih Date: Mon, 3 Jun 2019 11:45:11 +0800 Subject: mfd: cros_ec: differentiate SCP from EC by feature bit System Companion Processor (SCP) is Cortex M4 co-processor on some MediaTek platform that can run EC-style firmware. Since a SCP and EC would both exist on a system, and use the cros_ec_dev driver, we need to differentiate between them for the userspace, or they would both be registered at /dev/cros_ec, causing a conflict. Signed-off-by: Pi-Hsun Shih Acked-by: Enric Balletbo i Serra Signed-off-by: Lee Jones --- drivers/mfd/cros_ec_dev.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/mfd') diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index d992365472b8..a47223d2baf4 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -459,6 +459,16 @@ static int ec_device_probe(struct platform_device *pdev) ec_platform->ec_name = CROS_EC_DEV_TP_NAME; } + /* Check whether this is actually a SCP rather than an EC. */ + if (cros_ec_check_features(ec, EC_FEATURE_SCP)) { + dev_info(dev, "CrOS SCP MCU detected.\n"); + /* + * Help userspace differentiating ECs from SCP, + * regardless of the probing order. + */ + ec_platform->ec_name = CROS_EC_DEV_SCP_NAME; + } + /* * Add the class device * Link to the character device for creating the /dev entry -- cgit v1.2.3-55-g7522