linux-kernel - [PATCH v6 4/6] media: ov5693: add support for acpi clock-frequency prop

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Message-Id: <20220712163349.1308540-5-tommaso.merciai@amarulasolutions.com>
Date:   Tue, 12 Jul 2022 18:33:47 +0200
From:   Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To:     tommaso.merciai@...rulasolutions.com
Cc:     linuxfancy@...glegroups.com, linux-amarula@...rulasolutions.com,
        quentin.schulz@...obroma-systems.com,
        Jacopo Mondi <jacopo@...ndi.org>,
        Daniel Scally <djrscally@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 4/6] media: ov5693: add support for acpi clock-frequency prop

Add support for ACPI-based platforms that specify the clock frequency by
using the "clock-frequency" property instead of specifying a clock
provider reference

Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Reviewed-by: Jacopo Mondi <jacopo@...ndi.org>
---
Changes since v2:
 - Fix commit body as suggested by Sakari, Jacopo
 - Add details to commit body as suggested by Jacopo
 - Move ov5693_check_hwcfg into ov5693_hwcfg
 - Fix xvclk_rate position as suggested by Jacopo
 - Use devm_clk_get_optional instead of devm_clk_get as suggested Jacopo

Changes since v3:
 - Fix commit body as suggested by Jacopo
 - Add reviewed-by tags, suggested by Jacopo, Krzysztof

Changes since v4:
 - Remove wrong Sakari reviewed-by tag, suggested by Krzysztof, Sakari
 - Revert ov5693_check_hwcfg function changes. Keep clk init on probe function
as suggested by Sakari
 - Fix commit body
 - Fix commit msg

 drivers/media/i2c/ov5693.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/media/i2c/ov5693.c b/drivers/media/i2c/ov5693.c
index d2adc5513a21..701468267f20 100644
--- a/drivers/media/i2c/ov5693.c
+++ b/drivers/media/i2c/ov5693.c
@@ -1408,13 +1408,25 @@ static int ov5693_probe(struct i2c_client *client)
 
 	v4l2_i2c_subdev_init(&ov5693->sd, client, &ov5693_ops);
 
-	ov5693->xvclk = devm_clk_get(&client->dev, "xvclk");
-	if (IS_ERR(ov5693->xvclk)) {
-		dev_err(&client->dev, "Error getting clock\n");
-		return PTR_ERR(ov5693->xvclk);
+	ov5693->xvclk = devm_clk_get_optional(&client->dev, "xvclk");
+	if (IS_ERR(ov5693->xvclk))
+		return dev_err_probe(&client->dev, PTR_ERR(ov5693->xvclk),
+				     "failed to get xvclk: %ld\n",
+				     PTR_ERR(ov5693->xvclk));
+
+	if (ov5693->xvclk) {
+		xvclk_rate = clk_get_rate(ov5693->xvclk);
+	} else {
+		ret = fwnode_property_read_u32(dev_fwnode(&client->dev),
+				     "clock-frequency",
+				     &xvclk_rate);
+
+		if (ret) {
+			dev_err(&client->dev, "can't get clock frequency");
+			return ret;
+		}
 	}
 
-	xvclk_rate = clk_get_rate(ov5693->xvclk);
 	if (xvclk_rate != OV5693_XVCLK_FREQ)
 		dev_warn(&client->dev, "Found clk freq %u, expected %u\n",
 			 xvclk_rate, OV5693_XVCLK_FREQ);
-- 
2.25.1