linux-kernel - [PATCH 6/8] media: i2c: ov02e10: Implement specification t3 and t5 delays on power-up

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Message-Id: <20250317-b4-media-comitters-next-25-03-13-ov02e10-v1-6-bd924634b889@linaro.org>
Date: Mon, 17 Mar 2025 00:39:38 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>
Cc: Jingjing Xiong <jingjing.xiong@...el.com>, Hao Yao <hao.yao@...el.com>, 
 Jim Lai <jim.lai@...el.com>, You-Sheng Yang <vicamo.yang@...onical.com>, 
 Alan Stern <stern@...land.harvard.edu>, Hans de Goede <hdegoede@...hat.com>, 
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH 6/8] media: i2c: ov02e10: Implement specification t3 and t5
 delays on power-up

The ov02e10 specification says for power-on:

t3 = the time between dvdd stable and XSHUTDOWN deassert
t5 = the time between XSHUTDOWN deassert and SCCB ready

The power-off path in the spec shows no required delays between XSHUTDONW
and power-rail shut off so power-off is left alone.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/media/i2c/ov02e10.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov02e10.c b/drivers/media/i2c/ov02e10.c
index 9ad70671a718ea0aaf80ad3adcc5738ee57a7ff6..40c4d3ee36e3e2a0bb8be3ff10d016e2bb9bbc9d 100644
--- a/drivers/media/i2c/ov02e10.c
+++ b/drivers/media/i2c/ov02e10.c
@@ -579,7 +579,11 @@ static int ov02e10_power_on(struct device *dev)
 		goto disable_clk;
 	}
 
-	gpiod_set_value_cansleep(ov02e10->reset, 0);
+	if (ov02e10->reset) {
+		usleep_range(5000, 5100);
+		gpiod_set_value_cansleep(ov02e10->reset, 0);
+		usleep_range(8000, 8100);
+	}
 
 	return 0;
 

-- 
2.48.1