linux-kernel - [PATCH v3 2/4] media: i2c: ov5645: Switch to assigned-clock-rates

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Date:   Fri, 13 Mar 2020 21:12:32 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        NXP Linux Team <linux-imx@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Fabio Estevam <festevam@...il.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 2/4] media: i2c: ov5645: Switch to assigned-clock-rates

This patch switches to assigned-clock-rates for specifying the clock rate.
The clk-conf.c internally handles setting the clock rate when
assigned-clock-rates is passed.

The driver now sets the clock frequency only if the deprecated property
clock-frequency is defined instead assigned-clock-rates, this is to avoid
breakage with existing DT binaries.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/media/i2c/ov5645.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index a6c17d1..4fbabf3 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -1055,6 +1055,7 @@ static int ov5645_probe(struct i2c_client *client)
 	struct device_node *endpoint;
 	struct ov5645 *ov5645;
 	u8 chip_id_high, chip_id_low;
+	bool set_clk = false;
 	unsigned int i;
 	u32 xclk_freq;
 	int ret;
@@ -1094,12 +1095,18 @@ static int ov5645_probe(struct i2c_client *client)
 		return PTR_ERR(ov5645->xclk);
 	}
 
-	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
-	if (ret) {
-		dev_err(dev, "could not get xclk frequency\n");
-		return ret;
+	/* check if deprecated property clock-frequency is defined */
+	ret = of_property_read_u32(dev->of_node, "clock-frequency",
+				   &xclk_freq);
+	if (!ret) {
+		ret = clk_set_rate(ov5645->xclk, xclk_freq);
+		if (ret) {
+			dev_err(dev, "could not set xclk frequency\n");
+			return ret;
+		}
 	}
 
+	xclk_freq = clk_get_rate(ov5645->xclk);
 	/* external clock must be 24MHz, allow 1% tolerance */
 	if (xclk_freq < 23760000 || xclk_freq > 24240000) {
 		dev_err(dev, "external clock frequency %u is not supported\n",
@@ -1107,12 +1114,6 @@ static int ov5645_probe(struct i2c_client *client)
 		return -EINVAL;
 	}
 
-	ret = clk_set_rate(ov5645->xclk, xclk_freq);
-	if (ret) {
-		dev_err(dev, "could not set xclk frequency\n");
-		return ret;
-	}
-
 	for (i = 0; i < OV5645_NUM_SUPPLIES; i++)
 		ov5645->supplies[i].supply = ov5645_supply_name[i];
 
-- 
2.7.4