linux-kernel - [PATCH] media: platform: stm32: defer probe for auxiliary clock

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Date:   Tue, 21 Jan 2020 11:22:32 +0100
From:   Yannick Fertre <yannick.fertre@...com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Yannick Fertre <yannick.fertre@...com>,
        Etienne Carriere <etienne.carriere@...com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        <linux-media@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Philippe Cornu <philippe.cornu@...com>
Subject: [PATCH] media: platform: stm32: defer probe for auxiliary clock

From: Etienne Carriere <etienne.carriere@...com>

Change stm32-cec driver to defer probe when auxiliary clock
"hdmi-cec" is registered in the system not has not been probed yet.

Signed-off-by: Etienne Carriere <etienne.carriere@...com>
---
 drivers/media/platform/stm32/stm32-cec.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/stm32/stm32-cec.c b/drivers/media/platform/stm32/stm32-cec.c
index 8a86b2c..543c9ec 100644
--- a/drivers/media/platform/stm32/stm32-cec.c
+++ b/drivers/media/platform/stm32/stm32-cec.c
@@ -302,10 +302,14 @@ static int stm32_cec_probe(struct platform_device *pdev)
 	}
 
 	cec->clk_hdmi_cec = devm_clk_get(&pdev->dev, "hdmi-cec");
+	if (IS_ERR(cec->clk_hdmi_cec) &&
+	    PTR_ERR(cec->clk_hdmi_cec) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
 	if (!IS_ERR(cec->clk_hdmi_cec)) {
 		ret = clk_prepare(cec->clk_hdmi_cec);
 		if (ret) {
-			dev_err(&pdev->dev, "Unable to prepare hdmi-cec clock\n");
+			dev_err(&pdev->dev, "Can't prepare hdmi-cec clock\n");
 			return ret;
 		}
 	}
-- 
2.7.4