| Message ID | 1594812267-6697-10-git-send-email-claudiu.beznea@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | clk: at91: add sama7g5 clock support | expand |
On 15.07.2020 14:24, Claudiu Beznea wrote: > Register slow rc with accuracy option. > > Fixes: 04bcc4275e601 ("clk: at91: sckc: add support for SAM9X60") > Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> > --- > drivers/clk/at91/sckc.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c > index 15dc4cd86d76..2d65770d8665 100644 > --- a/drivers/clk/at91/sckc.c > +++ b/drivers/clk/at91/sckc.c > @@ -471,8 +471,9 @@ static void __init of_sam9x60_sckc_setup(struct device_node *np) > if (!regbase) > return; > > - slow_rc = clk_hw_register_fixed_rate(NULL, parent_names[0], NULL, 0, > - 32768); > + slow_rc = clk_hw_register_fixed_rate_with_accuracy(NULL, parent_names[0], > + NULL, 0, 32768, > + 93750000); I forgot to mention in commit message (I'll do it in v2 once I'll gather more comments on this series): Chapter 57.7.5 of SAM9X60 datasheet specifies that the maximum drift of this oscillator is +- 3KHz. I used that value and the formula at [1] or the calculator at [2] to compute the PPB value. [1] https://www.everythingrf.com/rf-calculators/ppm-to-hz-calculator [2] https://www.changpuak.ch/electronics/ppm_to_Hz_converter.php Thank you, Claudiu Beznea > if (IS_ERR(slow_rc)) > return; > >
diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c index 15dc4cd86d76..2d65770d8665 100644 --- a/drivers/clk/at91/sckc.c +++ b/drivers/clk/at91/sckc.c @@ -471,8 +471,9 @@ static void __init of_sam9x60_sckc_setup(struct device_node *np) if (!regbase) return; - slow_rc = clk_hw_register_fixed_rate(NULL, parent_names[0], NULL, 0, - 32768); + slow_rc = clk_hw_register_fixed_rate_with_accuracy(NULL, parent_names[0], + NULL, 0, 32768, + 93750000); if (IS_ERR(slow_rc)) return;
Register slow rc with accuracy option. Fixes: 04bcc4275e601 ("clk: at91: sckc: add support for SAM9X60") Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> --- drivers/clk/at91/sckc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)