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SubjectRe: [PATCH 2/2] media: i2c: ov5645: Switch to assigned-clock-rates
Hi Prabhakar,

On Mon, Mar 09, 2020 at 11:46:13AM +0000, Lad Prabhakar wrote:
> This patch switches to assigned-clock-rates for specifying the clock rate.
> The clk-conf.c internally handles setting the clock rate, as a result
> setting the clk rate from the driver is dropped.
>
> Correspondingly imx6qdl-wandboard.dtsi which references to ov5645 has been
> updated to use assigned-clock-rates in the same patch to avoid bisect
> failures.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> arch/arm/boot/dts/imx6qdl-wandboard.dtsi | 3 ++-
> drivers/media/i2c/ov5645.c | 9 ++-------
> 2 files changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
> index c070893..71f5f75 100644
> --- a/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-wandboard.dtsi
> @@ -126,7 +126,8 @@
> reg = <0x3c>;
> clocks = <&clks IMX6QDL_CLK_CKO2>;
> clock-names = "xclk";
> - clock-frequency = <24000000>;
> + assigned-clocks = <&clks IMX6QDL_CLK_CKO2>;
> + assigned-clock-rates = <24000000>;
> vdddo-supply = <&reg_1p8v>;
> vdda-supply = <&reg_2p8v>;
> vddd-supply = <&reg_1p5v>;

Shouldn't this be a separate patch?

> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index a6c17d1..2aa2677 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -1094,7 +1094,8 @@ 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);
> + ret = of_property_read_u32(dev->of_node, "assigned-clock-rates",
> + &xclk_freq);

I think you'd still need to check for clock-frequency to be compatible with
existing DT binaries.

> if (ret) {
> dev_err(dev, "could not get xclk frequency\n");
> return ret;
> @@ -1107,12 +1108,6 @@ 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];
>

--
Regards,

Sakari Ailus

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