[PATCH] dt-bindings: media: i2c: Fix external clock frequency for OV5645

[PATCH] dt-bindings: media: i2c: Fix external clock frequency for OV5645

[Manivannan Sadhasivam]

Commit "4adb0a0432f4 media: ov5645: Supported external clock is 24MHz"
modified the external clock frequency to be 24MHz instead of the
23.88MHz in driver. Hence, make the same change in corresponding bindings
doc and mention the acceptable tolerance.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 Documentation/devicetree/bindings/media/i2c/ov5645.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
index fd7aec9f8e24..b155583469a4 100644
--- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
+++ b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
@@ -8,7 +8,8 @@ Required Properties:
 - compatible: Value should be "ovti,ov5645".
 - clocks: Reference to the xclk clock.
 - clock-names: Should be "xclk".
-- clock-frequency: Frequency of the xclk clock.
+- clock-frequency: Frequency of the xclk clock. Should be 24MHz with 1%
+                   acceptable tolerance.
 - enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
   to the hardware pin PWDNB which is physically active low.
 - reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
@@ -37,7 +38,7 @@ Example:
 
 			clocks = <&clks 200>;
 			clock-names = "xclk";
-			clock-frequency = <23880000>;
+			clock-frequency = <24000000>;
 
 			vdddo-supply = <&camera_dovdd_1v8>;
 			vdda-supply = <&camera_avdd_2v8>;
-- 
2.17.1

Re: [PATCH] dt-bindings: media: i2c: Fix external clock frequency for OV5645

[Sakari Ailus]

Hi Manivannan,

On Wed, Nov 14, 2018 at 04:09:35PM +0530, Manivannan Sadhasivam wrote:
> Commit "4adb0a0432f4 media: ov5645: Supported external clock is 24MHz"
> modified the external clock frequency to be 24MHz instead of the
> 23.88MHz in driver. Hence, make the same change in corresponding bindings
> doc and mention the acceptable tolerance.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  Documentation/devicetree/bindings/media/i2c/ov5645.txt | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> index fd7aec9f8e24..b155583469a4 100644
> --- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> @@ -8,7 +8,8 @@ Required Properties:
>  - compatible: Value should be "ovti,ov5645".
>  - clocks: Reference to the xclk clock.
>  - clock-names: Should be "xclk".
> -- clock-frequency: Frequency of the xclk clock.
> +- clock-frequency: Frequency of the xclk clock. Should be 24MHz with 1%
> +                   acceptable tolerance.

DT bindings are for documenting the hardware, not the driver implementation.
The sensor supports a range AFAIU, not a specific frequency.

The bit below seems good.

>  - enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
>    to the hardware pin PWDNB which is physically active low.
>  - reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> @@ -37,7 +38,7 @@ Example:
>  
>  			clocks = <&clks 200>;
>  			clock-names = "xclk";
> -			clock-frequency = <23880000>;
> +			clock-frequency = <24000000>;
>  
>  			vdddo-supply = <&camera_dovdd_1v8>;
>  			vdda-supply = <&camera_avdd_2v8>;
> -- 
> 2.17.1
> 

-- 
Sakari Ailus
e-mail: sakari.ailus@iki.fi

Re: [PATCH] dt-bindings: media: i2c: Fix external clock frequency for OV5645

[Manivannan Sadhasivam]

On Wed, Nov 14, 2018 at 12:57:12PM +0200, Sakari Ailus wrote:
> Hi Manivannan,
> 
> On Wed, Nov 14, 2018 at 04:09:35PM +0530, Manivannan Sadhasivam wrote:
> > Commit "4adb0a0432f4 media: ov5645: Supported external clock is 24MHz"
> > modified the external clock frequency to be 24MHz instead of the
> > 23.88MHz in driver. Hence, make the same change in corresponding bindings
> > doc and mention the acceptable tolerance.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> >  Documentation/devicetree/bindings/media/i2c/ov5645.txt | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > index fd7aec9f8e24..b155583469a4 100644
> > --- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > @@ -8,7 +8,8 @@ Required Properties:
> >  - compatible: Value should be "ovti,ov5645".
> >  - clocks: Reference to the xclk clock.
> >  - clock-names: Should be "xclk".
> > -- clock-frequency: Frequency of the xclk clock.
> > +- clock-frequency: Frequency of the xclk clock. Should be 24MHz with 1%
> > +                   acceptable tolerance.
> 
> DT bindings are for documenting the hardware, not the driver implementation.
> The sensor supports a range AFAIU, not a specific frequency.
>

Agree! That's my bad.

> The bit below seems good.
> 

Okay. Will remove the above change and send v2.

Thanks,
Mani

> >  - enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
> >    to the hardware pin PWDNB which is physically active low.
> >  - reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> > @@ -37,7 +38,7 @@ Example:
> >  
> >  			clocks = <&clks 200>;
> >  			clock-names = "xclk";
> > -			clock-frequency = <23880000>;
> > +			clock-frequency = <24000000>;
> >  
> >  			vdddo-supply = <&camera_dovdd_1v8>;
> >  			vdda-supply = <&camera_avdd_2v8>;
> > -- 
> > 2.17.1
> > 
> 
> -- 
> Sakari Ailus
> e-mail: sakari.ailus@iki.fi