Re: [PATCH 09/19] clk: at91: sckc: register slow_rc with accuracy option
From: <hidden>
Date: 2020-07-15 15:39:39
Also in:
linux-clk, lkml
On 15.07.2020 14:24, Claudiu Beznea wrote:
quoted hunk ↗ jump to hunk
Register slow rc with accuracy option. Fixes: 04bcc4275e601 ("clk: at91: sckc: add support for SAM9X60") Signed-off-by: Claudiu Beznea <redacted> --- 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;
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