[PATCH 6.19 613/844] media: stm32: dcmipp: avoid naming clock if only one is needed

[Sasha Levin]

From: Alain Volmat <alain.volmat@xxxxxxxxxxx>

[ Upstream commit 2f130245f2143fa8f4da77071f844911d2c69319 ]

When DCMIPP requires only a single clock (kclk), avoid relying on its
name to obtain it. The introduction of MP25 support added the mclk,
which necessitated naming the first clock kclk. However, this breaks
backward compatibility with existing MP13 device trees that do not
specify clock names.

Fixes: 686f27f7ea37 ("media: stm32: dcmipp: add core support for the stm32mp25")
Signed-off-by: Alain Volmat <alain.volmat@xxxxxxxxxxx>
Cc: Stable@xxxxxxxxxxxxxxx # 6.14.x: 7f487562af49 media: stm32: dcmipp: correct ret type in dcmipp_graph_notify_bound
Cc: Stable@xxxxxxxxxxxxxxx # 6.14.x: c715dd62da30 media: stm32: dcmipp: add has_csi2 & needs_mclk in match data
Cc: Stable@xxxxxxxxxxxxxxx # 6.14.x:
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil+cisco@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
index 1b7bae3266c8d..49398d0777646 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
@@ -526,7 +526,12 @@ static int dcmipp_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	kclk = devm_clk_get(&pdev->dev, "kclk");
+	/*
+	 * In case of the DCMIPP has only 1 clock (such as on MP13), the
+	 * clock might not be named.
+	 */
+	kclk = devm_clk_get(&pdev->dev,
+			    dcmipp->pipe_cfg->needs_mclk ? "kclk" : NULL);
 	if (IS_ERR(kclk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(kclk),
 				     "Unable to get kclk\n");
-- 
2.51.0