diff mbox series

[v2,08/18] clk: at91: sckc: register slow_rc with accuracy option

Message ID 1595403506-8209-9-git-send-email-claudiu.beznea@microchip.com (mailing list archive)
State New, archived
Headers show
Series clk: at91: add sama7g5 clock support | expand

Commit Message

Claudiu Beznea July 22, 2020, 7:38 a.m. UTC 
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 <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

Stephen Boyd July 24, 2020, 9:21 a.m. UTC | #1 
Quoting Claudiu Beznea (2020-07-22 00:38:16)
> 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 <claudiu.beznea@microchip.com>
> ---

Applied to clk-next
diff mbox series

Patch

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;