Re: [PATCH v2 2/2] media: i2c: add support for ov4689

[Sakari Ailus]

Hi Mikhail,

On Thu, Sep 22, 2022 at 06:23:05PM +0300, Mikhail Rudenko wrote:
> 
> Hi Sakari,
> 
> and thanks for reviewing this!

You're welcome!

> 
> Please see my comments below:
> 
> On 2022-09-22 at 09:53 GMT, Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> wrote:
...
> >> +static inline u32 ov4689_cal_delay(u32 cycles)
> >> +{
> >> +	return DIV_ROUND_UP(cycles, OV4689_XVCLK_FREQ / 1000 / 1000);
> >
> > Please use the actual rate instead.
> >
> 
> Do you mean clk_get_rate(ov4689->xvclk), right? What if we have an ACPI

Yes.

> system and xvclk is NULL here? Please explain.

There are a few ways this could work on ACPI based systems but generally
you'd have "clock-frequency" property to indicate the frequency even if
clocks themselves wouldn't be available (when controlled via ACPI)).

-- 
Kind regards,

Sakari Ailus