linux-kernel - [PATCH v2] usb: typec: tipd: Don't block probing of consumer of "connector" nodes

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Message-Id: <20210714061807.5737-1-martin.kepplinger@puri.sm>
Date:   Wed, 14 Jul 2021 08:18:07 +0200
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     saravanak@...gle.com, grandmaster@...klimov.de,
        gregkh@...uxfoundation.org, heikki.krogerus@...ux.intel.com,
        rjw@...ysocki.net
Cc:     kernel@...i.sm, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, martin.kepplinger@...i.sm
Subject: [PATCH v2] usb: typec: tipd: Don't block probing of consumer of "connector" nodes

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")
Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
---

revision history
----------------
v2: (thank you Saravana)
* add a code-comment why the call is needed.

v1:
https://lore.kernel.org/linux-usb/20210713073946.102501-1-martin.kepplinger@puri.sm/



 drivers/usb/typec/tipd/core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 938219bc1b4b..21b3ae25c76d 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -629,6 +629,15 @@ static int tps6598x_probe(struct i2c_client *client)
 	if (!fwnode)
 		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 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);
+
 	tps->role_sw = fwnode_usb_role_switch_get(fwnode);
 	if (IS_ERR(tps->role_sw)) {
 		ret = PTR_ERR(tps->role_sw);
-- 
2.30.2