linux-kernel - [PATCH] mfd: cros_ec: Separate charge-control probing from USB-PD

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Message-Id: <20250521-cros-ec-mfd-chctl-probe-v1-1-6ebfe3a6efa7@weissschuh.net>
Date: Wed, 21 May 2025 16:42:51 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Lee Jones <lee@...nel.org>, Benson Leung <bleung@...omium.org>, 
 Guenter Roeck <groeck@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] mfd: cros_ec: Separate charge-control probing from USB-PD

The charge-control subsystem in the ChromeOS EC is not strictly tied to
its USB-PD subsystem.
Since commit 7613bc0d116a ("mfd: cros_ec: Don't load charger with UCSI")
the presence of EC_FEATURE_UCSI_PPM would inhibit the probing of the
charge-control driver.
Furthermore recent versions of the EC firmware in Framework laptops
hard-disable EC_FEATURE_USB_PD to avoid probing cros-usbpd-charger,
which then also breaks cros-charge-control.

Instead use the dedicated EC_FEATURE_CHARGER.

Link: https://github.com/FrameworkComputer/EmbeddedController/commit/1d7bcf1d50137c8c01969eb65880bc83e424597e
Fixes: 555b5fcdb844 ("mfd: cros_ec: Register charge control subdevice")
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/mfd/cros_ec_dev.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 9f84a52b48d6a8994d23edba999398684303ee64..dc80a272726bb16b58253418999021cd56dfd975 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -87,7 +87,6 @@ static const struct mfd_cell cros_ec_sensorhub_cells[] = {
 };
 
 static const struct mfd_cell cros_usbpd_charger_cells[] = {
-	{ .name = "cros-charge-control", },
 	{ .name = "cros-usbpd-charger", },
 	{ .name = "cros-usbpd-logger", },
 };
@@ -112,6 +111,10 @@ static const struct mfd_cell cros_ec_ucsi_cells[] = {
 	{ .name = "cros_ec_ucsi", },
 };
 
+static const struct mfd_cell cros_ec_charge_control_cells[] = {
+	{ .name = "cros-charge-control", },
+};
+
 static const struct cros_feature_to_cells cros_subdevices[] = {
 	{
 		.id		= EC_FEATURE_CEC,
@@ -148,6 +151,11 @@ static const struct cros_feature_to_cells cros_subdevices[] = {
 		.mfd_cells	= cros_ec_keyboard_leds_cells,
 		.num_cells	= ARRAY_SIZE(cros_ec_keyboard_leds_cells),
 	},
+	{
+		.id		= EC_FEATURE_CHARGER,
+		.mfd_cells	= cros_ec_charge_control_cells,
+		.num_cells	= ARRAY_SIZE(cros_ec_charge_control_cells),
+	},
 };
 
 static const struct mfd_cell cros_ec_platform_cells[] = {

---
base-commit: 4a95bc121ccdaee04c4d72f84dbfa6b880a514b6
change-id: 20250521-cros-ec-mfd-chctl-probe-64a63ac9c160

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>