From: Claudiu Beznea Date: Wed, 22 Jul 2020 07:38:16 +0000 (+0300) Subject: clk: at91: sckc: register slow_rc with accuracy option X-Git-Tag: v5.15~3112^2^5~10 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e1e3e7008a90f9ffe0161191bd64a4c06f0d417a;p=platform%2Fkernel%2Flinux-starfive.git clk: at91: sckc: register slow_rc with accuracy option Chapter 57.7.5 of SAM9X60 datasheet specifies that the maximum drift of this oscillator is +- 3KHz. Use 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 Fixes: 04bcc4275e601 ("clk: at91: sckc: add support for SAM9X60") Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/1595403506-8209-9-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c index 15dc4cd..2d65770 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;