| Message ID | 20230603200243.243878-14-varshini.rajendran@microchip.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Add support for sam9x7 SoC family | expand |
On 03.06.2023 23:02, Varshini Rajendran wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Add support for hardware dividers for PLL IDs in sam9x7 Soc dot at the end of line, probably. s/Soc/SoC. Also, please explain it as clear as possible. > PLL_ID_PLLA and PLL_ID_PLLA_DIV2 has /2 hardware dividers each At the time of this patch PLL_ID_PLLA and PLL_ID_PLLA_DIV2 does't exist thus would be more clear if you reference datasheet naming. Other than this code looks good to me. Thank you, Claudiu > > fcorepllack -----> HW Div = 2 -+--> fpllack > | > +--> HW Div = 2 ---> fplladiv2ck > > Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com> > --- > drivers/clk/at91/clk-sam9x60-pll.c | 38 ++++++++++++++++++++++++++---- > drivers/clk/at91/pmc.h | 1 + > 2 files changed, 34 insertions(+), 5 deletions(-) > > diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c > index b3012641214c..76273ea74f8b 100644 > --- a/drivers/clk/at91/clk-sam9x60-pll.c > +++ b/drivers/clk/at91/clk-sam9x60-pll.c > @@ -73,9 +73,15 @@ static unsigned long sam9x60_frac_pll_recalc_rate(struct clk_hw *hw, > { > struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); > struct sam9x60_frac *frac = to_sam9x60_frac(core); > + unsigned long freq; > > - return parent_rate * (frac->mul + 1) + > + freq = parent_rate * (frac->mul + 1) + > DIV_ROUND_CLOSEST_ULL((u64)parent_rate * frac->frac, (1 << 22)); > + > + if (core->layout->div2) > + freq >>= 1; > + > + return freq; > } > > static int sam9x60_frac_pll_set(struct sam9x60_pll_core *core) > @@ -432,6 +438,12 @@ static unsigned long sam9x60_div_pll_recalc_rate(struct clk_hw *hw, > return DIV_ROUND_CLOSEST_ULL(parent_rate, (div->div + 1)); > } > > +static unsigned long sam9x60_fixed_div_pll_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + return parent_rate >> 1; > +} > + > static long sam9x60_div_pll_compute_div(struct sam9x60_pll_core *core, > unsigned long *parent_rate, > unsigned long rate) > @@ -606,6 +618,16 @@ static const struct clk_ops sam9x60_div_pll_ops_chg = { > .restore_context = sam9x60_div_pll_restore_context, > }; > > +static const struct clk_ops sam9x60_fixed_div_pll_ops = { > + .prepare = sam9x60_div_pll_prepare, > + .unprepare = sam9x60_div_pll_unprepare, > + .is_prepared = sam9x60_div_pll_is_prepared, > + .recalc_rate = sam9x60_fixed_div_pll_recalc_rate, > + .round_rate = sam9x60_div_pll_round_rate, > + .save_context = sam9x60_div_pll_save_context, > + .restore_context = sam9x60_div_pll_restore_context, > +}; > + > struct clk_hw * __init > sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, > const char *name, const char *parent_name, > @@ -718,10 +740,16 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, > init.name = name; > init.parent_names = &parent_name; > init.num_parents = 1; > - if (flags & CLK_SET_RATE_GATE) > - init.ops = &sam9x60_div_pll_ops; > - else > - init.ops = &sam9x60_div_pll_ops_chg; > + > + if (layout->div2) { > + init.ops = &sam9x60_fixed_div_pll_ops; > + } else { > + if (flags & CLK_SET_RATE_GATE) > + init.ops = &sam9x60_div_pll_ops; > + else > + init.ops = &sam9x60_div_pll_ops_chg; > + } > + > init.flags = flags; > > div->core.id = id; > diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h > index 3e36dcc464c1..1dd01f30bdee 100644 > --- a/drivers/clk/at91/pmc.h > +++ b/drivers/clk/at91/pmc.h > @@ -64,6 +64,7 @@ struct clk_pll_layout { > u8 frac_shift; > u8 div_shift; > u8 endiv_shift; > + u8 div2; > }; > > extern const struct clk_pll_layout at91rm9200_pll_layout; > -- > 2.25.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c index b3012641214c..76273ea74f8b 100644 --- a/drivers/clk/at91/clk-sam9x60-pll.c +++ b/drivers/clk/at91/clk-sam9x60-pll.c @@ -73,9 +73,15 @@ static unsigned long sam9x60_frac_pll_recalc_rate(struct clk_hw *hw, { struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); struct sam9x60_frac *frac = to_sam9x60_frac(core); + unsigned long freq; - return parent_rate * (frac->mul + 1) + + freq = parent_rate * (frac->mul + 1) + DIV_ROUND_CLOSEST_ULL((u64)parent_rate * frac->frac, (1 << 22)); + + if (core->layout->div2) + freq >>= 1; + + return freq; } static int sam9x60_frac_pll_set(struct sam9x60_pll_core *core) @@ -432,6 +438,12 @@ static unsigned long sam9x60_div_pll_recalc_rate(struct clk_hw *hw, return DIV_ROUND_CLOSEST_ULL(parent_rate, (div->div + 1)); } +static unsigned long sam9x60_fixed_div_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return parent_rate >> 1; +} + static long sam9x60_div_pll_compute_div(struct sam9x60_pll_core *core, unsigned long *parent_rate, unsigned long rate) @@ -606,6 +618,16 @@ static const struct clk_ops sam9x60_div_pll_ops_chg = { .restore_context = sam9x60_div_pll_restore_context, }; +static const struct clk_ops sam9x60_fixed_div_pll_ops = { + .prepare = sam9x60_div_pll_prepare, + .unprepare = sam9x60_div_pll_unprepare, + .is_prepared = sam9x60_div_pll_is_prepared, + .recalc_rate = sam9x60_fixed_div_pll_recalc_rate, + .round_rate = sam9x60_div_pll_round_rate, + .save_context = sam9x60_div_pll_save_context, + .restore_context = sam9x60_div_pll_restore_context, +}; + struct clk_hw * __init sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, @@ -718,10 +740,16 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, init.name = name; init.parent_names = &parent_name; init.num_parents = 1; - if (flags & CLK_SET_RATE_GATE) - init.ops = &sam9x60_div_pll_ops; - else - init.ops = &sam9x60_div_pll_ops_chg; + + if (layout->div2) { + init.ops = &sam9x60_fixed_div_pll_ops; + } else { + if (flags & CLK_SET_RATE_GATE) + init.ops = &sam9x60_div_pll_ops; + else + init.ops = &sam9x60_div_pll_ops_chg; + } + init.flags = flags; div->core.id = id; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 3e36dcc464c1..1dd01f30bdee 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -64,6 +64,7 @@ struct clk_pll_layout { u8 frac_shift; u8 div_shift; u8 endiv_shift; + u8 div2; }; extern const struct clk_pll_layout at91rm9200_pll_layout;
Add support for hardware dividers for PLL IDs in sam9x7 Soc PLL_ID_PLLA and PLL_ID_PLLA_DIV2 has /2 hardware dividers each fcorepllack -----> HW Div = 2 -+--> fpllack | +--> HW Div = 2 ---> fplladiv2ck Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com> --- drivers/clk/at91/clk-sam9x60-pll.c | 38 ++++++++++++++++++++++++++---- drivers/clk/at91/pmc.h | 1 + 2 files changed, 34 insertions(+), 5 deletions(-)