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Commit 8918bd8a authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: at91sam9: get sclk rate after enabling it 



See help for clk_get_rate(): "obtain the current clock rate (in Hz) for a
clock source. This is only valid once the clock source has been enabled."

It currently returns the correct value but that may not stay that way.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 6932ff53

drivers/rtc/rtc-at91sam9.c

+7 −6
Original line number Diff line number Diff line
@@ -425,18 +425,19 @@ static int at91_rtc_probe(struct platform_device *pdev) 
	if (IS_ERR(rtc->sclk))

		return PTR_ERR(rtc->sclk);



	sclk_rate = clk_get_rate(rtc->sclk);

	if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {

		dev_err(&pdev->dev, "Invalid slow clock rate\n");

		return -EINVAL;

	}



	ret = clk_prepare_enable(rtc->sclk);

	if (ret) {

		dev_err(&pdev->dev, "Could not enable slow clock\n");

		return ret;

	}



	sclk_rate = clk_get_rate(rtc->sclk);

	if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {

		dev_err(&pdev->dev, "Invalid slow clock rate\n");

		ret = -EINVAL;

		goto err_clk;

	}



	mr = rtt_readl(rtc, MR);



	/* unless RTT is counting at 1 Hz, re-initialize it */