netdev - [PATCH V2] ptp: clockmatrix: Add Defer probe if firmware load fails

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Date: Wed, 14 Jun 2023 10:42:04 +0530
From: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
To: <richardcochran@...il.com>, <netdev@...r.kernel.org>
CC: <simon.horman@...igine.com>, <andrew@...n.ch>,
	<linux-kernel@...r.kernel.org>, <vincent.cheng.xh@...esas.com>,
	<harini.katakam@....com>, <git@....com>, <sarath.babu.naidu.gaddam@....com>
Subject: [PATCH V2] ptp: clockmatrix: Add Defer probe if firmware load fails

Clock matrix driver can be probed before the rootfs containing
firmware/initialization .bin is available. The current driver
throws a warning and proceeds to execute probe even when firmware
is not ready. Instead, defer probe and wait for the .bin file to
be available.

Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
---
Changes in V2:
1) Added mutex_unlock(idtcm->lock); before returning EPROBE_DEFER.
2) Moved failure log after defer probe.
---
 drivers/ptp/ptp_clockmatrix.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index c9d451bf89e2..b3cb136257e3 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -2424,8 +2424,13 @@ static int idtcm_probe(struct platform_device *pdev)
 
 	err = idtcm_load_firmware(idtcm, &pdev->dev);
 
-	if (err)
+	if (err) {
+		if (err == -ENOENT) {
+			mutex_unlock(idtcm->lock);
+			return -EPROBE_DEFER;
+		}
 		dev_warn(idtcm->dev, "loading firmware failed with %d", err);
+	}
 
 	wait_for_chip_ready(idtcm);
 
-- 
2.25.1