linux-kernel - [PATCH] [media] ov7670: make "xclk" clock optional

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Message-Id: <20181004212903.364064-1-lkundrak@v3.sk>
Date:   Thu,  4 Oct 2018 23:29:03 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lubomir Rintel <lkundrak@...sk>, stable@...r.kernel.org
Subject: [PATCH] [media] ov7670: make "xclk" clock optional

When the "xclk" clock was added, it was made mandatory. This broke the
driver on an OLPC plaform which doesn't know such clock. Make it
optional.

Tested on a OLPC XO-1 laptop.

Cc: stable@...r.kernel.org # 4.11+
Fixes: 0a024d634cee ("[media] ov7670: get xclk")
Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/media/i2c/ov7670.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index 31bf577b0bd3..64d1402882c8 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -1808,17 +1808,24 @@ static int ov7670_probe(struct i2c_client *client,
 			info->pclk_hb_disable = true;
 	}
 
-	info->clk = devm_clk_get(&client->dev, "xclk");
-	if (IS_ERR(info->clk))
-		return PTR_ERR(info->clk);
-	ret = clk_prepare_enable(info->clk);
-	if (ret)
-		return ret;
+	info->clk = devm_clk_get(&client->dev, "xclk"); /* optional */
+	if (IS_ERR(info->clk)) {
+		ret = PTR_ERR(info->clk);
+		if (ret == -ENOENT)
+			info->clk = NULL;
+		else
+			return ret;
+	}
+	if (info->clk) {
+		ret = clk_prepare_enable(info->clk);
+		if (ret)
+			return ret;
 
-	info->clock_speed = clk_get_rate(info->clk) / 1000000;
-	if (info->clock_speed < 10 || info->clock_speed > 48) {
-		ret = -EINVAL;
-		goto clk_disable;
+		info->clock_speed = clk_get_rate(info->clk) / 1000000;
+		if (info->clock_speed < 10 || info->clock_speed > 48) {
+			ret = -EINVAL;
+			goto clk_disable;
+		}
 	}
 
 	ret = ov7670_init_gpio(client, info);
-- 
2.19.0