linux-kernel - [PATCH 5.13 175/223] usb: typec: stusb160x: Dont block probing of consumer of "connector" nodes

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Message-Id: <20210726153851.921391987@linuxfoundation.org>
Date:   Mon, 26 Jul 2021 17:39:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Amelie Delaunay <amelie.delaunay@...s.st.com>
Subject: [PATCH 5.13 175/223] usb: typec: stusb160x: Dont block probing of consumer of "connector" nodes

From: Amelie Delaunay <amelie.delaunay@...s.st.com>

commit 6b63376722d9e1b915a2948e9b30f4ba2712e3f5 upstream.

Similar as with tcpm this patch lets fw_devlink know not to wait on the
fwnode to be populated as a struct device.

Without this patch, USB functionality can be broken on some previously
supported boards.

Fixes: 28ec344bb891 ("usb: typec: tcpm: Don't block probing of consumers of "connector" nodes")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
Link: https://lore.kernel.org/r/20210716120718.20398-3-amelie.delaunay@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/stusb160x.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/usb/typec/stusb160x.c
+++ b/drivers/usb/typec/stusb160x.c
@@ -686,6 +686,15 @@ static int stusb160x_probe(struct i2c_cl
 		return -ENODEV;
 
 	/*
+	 * This fwnode has a "compatible" property, but is never populated as a
+	 * struct device. Instead we simply parse it to read the properties.
+	 * This it breaks fw_devlink=on. To maintain backward compatibility
+	 * with existing DT files, we work around this by deleting any
+	 * fwnode_links to/from this fwnode.
+	 */
+	fw_devlink_purge_absent_suppliers(fwnode);
+
+	/*
 	 * When both VDD and VSYS power supplies are present, the low power
 	 * supply VSYS is selected when VSYS voltage is above 3.1 V.
 	 * Otherwise VDD is selected.