Re: [PATCH 3/6] drm: bridge: samsung-dsim: Fetch pll-clock-frequency automatically

[Adam Ford <aford173@gmail.com>]

On Sun, Apr 16, 2023 at 5:08 PM Marek Vasut <marex@denx.de> wrote:
>
> On 4/15/23 12:41, Adam Ford wrote:
> > Fetch the clock rate of "sclk_mipi" (or "pll_clk") instead of
> > having an entry in the device tree for samsung,pll-clock-frequency.
> >
> > Signed-off-by: Adam Ford <aford173@gmail.com>
> > ---
> >   drivers/gpu/drm/bridge/samsung-dsim.c | 12 ++++++------
> >   1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
> > index 9fec32b44e05..73f0c3fbbdf5 100644
> > --- a/drivers/gpu/drm/bridge/samsung-dsim.c
> > +++ b/drivers/gpu/drm/bridge/samsung-dsim.c
> > @@ -1744,11 +1744,6 @@ static int samsung_dsim_parse_dt(struct samsung_dsim *dsi)
> >       struct device_node *node = dev->of_node;
> >       int ret;
> >
> > -     ret = samsung_dsim_of_read_u32(node, "samsung,pll-clock-frequency",
> > -                                    &dsi->pll_clk_rate);
> > -     if (ret < 0)
> > -             return ret;
> > -
> >       ret = samsung_dsim_of_read_u32(node, "samsung,burst-clock-frequency",
> >                                      &dsi->burst_clk_rate);
> >       if (ret < 0)
>
> Does this break compatibility with old samsung DTs ?

My goal here was to declutter the device tree stuff and fetch data
automatically if possible. What if I changed this to make them
optional?  If they exist, we can use them, if they don't exist, we
could read the clock rate.  Would that be acceptable?

adam