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clk: at91: main: warn when the main crystal frequency is not set

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When the main crystal frequency is not set, the main clock is approximated using
the MAINF value in the CKGR_MCFR register. Warn the user in that case.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris BREZILLON <boris.brezillon@overkiz.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Alexandre Belloni 2014-07-01 16:12:12 +02:00 committed by Mike Turquette
parent 942d1d6749
commit 4da66b631f
1 changed files with 1 additions and 0 deletions
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drivers/clk/at91/clk-main.c
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@ -388,6 +388,7 @@ static unsigned long clk_main_recalc_rate(struct at91_pmc *pmc,
if (parent_rate)
return parent_rate;
pr_warn("Main crystal frequency not set, using approximate value\n");
tmp = pmc_read(pmc, AT91_CKGR_MCFR);
if (!(tmp & AT91_PMC_MAINRDY))
return 0;