linux-kernel - [PATCH] platform/chrome: cros_ec_typec: Defer probe on missing EC parent

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Message-ID: <20250610153748.1858519-1-tmichalec@google.com>
Date: Tue, 10 Jun 2025 17:37:47 +0200
From: Tomasz Michalec <tmichalec@...gle.com>
To: Benson Leung <bleung@...omium.org>, 
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>, Jameson Thies <jthies@...gle.com>, 
	Andrei Kuchynski <akuchynski@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>
Cc: Guenter Roeck <groeck@...omium.org>, Konrad Adamczyk <konrada@...gle.com>, 
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	chromeos-krk-upstreaming@...gle.com, Tomasz Michalec <tmichalec@...gle.com>
Subject: [PATCH] platform/chrome: cros_ec_typec: Defer probe on missing EC parent

If cros_typec_probe is called before EC device is registered,
cros_typec_probe will fail. It may happen when cros-ec-typec.ko is
loaded before EC bus layer module (e.g. cros_ec_lpcs.ko,
cros_ec_spi.ko).

Return -EPROBE_DEFER when cros_typec_probe doesn't get EC device, so
the probe function can be called again after EC device is registered.

Signed-off-by: Tomasz Michalec <tmichalec@...gle.com>
---
 drivers/platform/chrome/cros_ec_typec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 7678e3d05fd3..f437b594055c 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -1272,8 +1272,8 @@ static int cros_typec_probe(struct platform_device *pdev)
 
 	typec->ec = dev_get_drvdata(pdev->dev.parent);
 	if (!typec->ec) {
-		dev_err(dev, "couldn't find parent EC device\n");
-		return -ENODEV;
+		dev_warn(dev, "couldn't find parent EC device\n");
+		return -EPROBE_DEFER;
 	}
 
 	platform_set_drvdata(pdev, typec);
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog