Hi Biju,
Thank you for your patch.
On Thu, Aug 14, 2025 at 07:41:08PM +0100, Biju wrote:
> From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
>
> RZ/G2L GPT the prescale factors are continuous power of 4 whereas on RZ/G3E
> it is power of 2 but discontinuous. Add calculate_prescale() callback to
> struct rzg2l_gpt_info for handling this difference.
>
Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@xxxxxxxxxxxxxx>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Thanks & Regards,
Tommaso
> ---
> drivers/pwm/pwm-rzg2l-gpt.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pwm/pwm-rzg2l-gpt.c b/drivers/pwm/pwm-rzg2l-gpt.c
> index 74bb0cca4ab4..b247a6c181d5 100644
> --- a/drivers/pwm/pwm-rzg2l-gpt.c
> +++ b/drivers/pwm/pwm-rzg2l-gpt.c
> @@ -90,6 +90,7 @@
> #define RZG2L_MAX_TICKS ((u64)U32_MAX * RZG2L_MAX_SCALE_FACTOR)
>
> struct rzg2l_gpt_info {
> + u8 (*calculate_prescale)(u64 period);
> u32 gtcr_tpcs_mask;
> u8 prescale_pow_of_two_mult_factor;
> };
> @@ -138,8 +139,7 @@ static void rzg2l_gpt_modify(struct rzg2l_gpt_chip *rzg2l_gpt, u32 reg, u32 clr,
> (rzg2l_gpt_read(rzg2l_gpt, reg) & ~clr) | set);
> }
>
> -static u8 rzg2l_gpt_calculate_prescale(struct rzg2l_gpt_chip *rzg2l_gpt,
> - u64 period_ticks)
> +static u8 rzg2l_gpt_calculate_prescale(u64 period_ticks)
> {
> u32 prescaled_period_ticks;
> u8 prescale;
> @@ -292,7 +292,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chip *chip,
> period_ticks = rzg2l_gpt->period_ticks[ch];
> }
>
> - wfhw->prescale = rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks);
> + wfhw->prescale = info->calculate_prescale(period_ticks);
> pv = rzg2l_gpt_calculate_pv_or_dc(info, period_ticks, wfhw->prescale);
> wfhw->gtpr = pv;
> duty_ticks = mul_u64_u64_div_u64(wf->duty_length_ns, rzg2l_gpt->rate_khz, USEC_PER_SEC);
> @@ -482,6 +482,7 @@ static int rzg2l_gpt_probe(struct platform_device *pdev)
> }
>
> static const struct rzg2l_gpt_info rzg2l_data = {
> + .calculate_prescale = rzg2l_gpt_calculate_prescale,
> .gtcr_tpcs_mask = GENMASK(26, 24),
> .prescale_pow_of_two_mult_factor = 2,
> };
> --
> 2.43.0
>
