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clk: at91: sckc: register slow_rc with accuracy option

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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: 04bcc4275e ("clk: at91: sckc: add support for SAM9X60")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1595403506-8209-9-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Claudiu Beznea 2020-07-22 10:38:16 +03:00 committed by Stephen Boyd
parent 172e7ddeea
commit e1e3e7008a
1 changed files with 3 additions and 2 deletions
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5
drivers/clk/at91/sckc.c
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@ -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;