RE: [PATCH v2 5/9] clk: renesas: rzg2l: Add support for LVDS fixed-factor divider with 4:7 duty cycle

[Biju Das]

Hi Geert,

Thanks for the feedback.

> -----Original Message-----
> From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Sent: 14 August 2026 13:35
> Subject: Re: [PATCH v2 5/9] clk: renesas: rzg2l: Add support for LVDS fixed-factor divider with 4:7 duty
> cycle
> 
> Hi Biju,
> 
> On Tue, 11 Aug 2026 at 20:27, Biju <biju.das.au@xxxxxxxxx> wrote:
> >
> > From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> >
> > Add a new CLK_TYPE_G3L_LVDS_DIV clock type and register function for a
> > fixed-factor divider used by the LVDS clock, which cannot produce a
> > 50% duty cycle for odd divider values. Implement a custom
> > get_duty_cycle() callback that reports the actual (div + 1) / 2 : div
> > duty cycle, and add the DEF_G3L_LVDS_DIV() macro to define such
> > clocks.
> >
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> 
> Thanks for your patch!
> 
> > +static int rzg3l_cpg_lvds_div_get_duty_cycle(struct clk_hw *hw,
> > +                                            struct clk_duty *duty) {
> > +       struct clk_fixed_factor *fix = to_clk_fixed_factor(hw);
> > +
> > +       /*
> > +        * An odd divider cannot generate a 50% duty cycle: the output stays
> > +        * high for (div + 1) / 2 input clock cycles out of div, e.g. a divider
> > +        * of 7 gives a duty cycle of 4/7.
> > +        */
> > +       duty->num = (fix->div + 1) / 2;
> 
> DIV_ROUND_UP()

Ok.

> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> i.e. will queue in renesas-clk for v7.4, with
> the above fixed.

Thank you,

Cheers,
Biju