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| author | Johan Hovold <johan@kernel.org> | 2014-12-10 15:53:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:14 -0800 |
| commit | 9291e340fc630b62552fe9dcffca0a1706da5410 (patch) | |
| tree | 58243a7e9fc22dd9a51218942274fd99069de805 /drivers/rtc | |
| parent | 2153f94943ca6c47df585205bfde0c5f1311f84b (diff) | |
| download | linux-9291e340fc630b62552fe9dcffca0a1706da5410.tar.gz | |
rtc: omap: silence bogus power-up reset message at probe
Some legacy RTC IP revisions has a power-up reset flag in the status register that later revisions lack. As this flag is always read back as set on later revisions (or is overloaded with a different flag), make sure to only clear the flag and print the info message on legacy platforms. Signed-off-by: Johan Hovold <johan@kernel.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Tony Lindgren <tony@atomide.com> Cc: Benot Cousson <bcousson@baylibre.com> Cc: Lokesh Vutla <lokeshvutla@ti.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Sekhar Nori <nsekhar@ti.com> Cc: Tero Kristo <t-kristo@ti.com> Cc: Keerthy J <j-keerthy@ti.com> Tested-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 1abd88e24c22..ee20f2d36065 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -106,6 +106,7 @@ struct omap_rtc_device_type { bool has_32kclk_en; bool has_kicker; bool has_irqwakeen; + bool has_power_up_reset; }; struct omap_rtc { @@ -346,6 +347,7 @@ static struct rtc_class_ops omap_rtc_ops = { }; static const struct omap_rtc_device_type omap_rtc_default_type = { + .has_power_up_reset = true, }; static const struct omap_rtc_device_type omap_rtc_am3352_type = { @@ -391,7 +393,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev) { struct omap_rtc *rtc; struct resource *res; - u8 reg, new_ctrl; + u8 reg, mask, new_ctrl; const struct platform_device_id *id_entry; const struct of_device_id *of_id; int ret; @@ -448,12 +450,17 @@ static int __init omap_rtc_probe(struct platform_device *pdev) /* clear old status */ reg = rtc_read(rtc, OMAP_RTC_STATUS_REG); - if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) { - dev_info(&pdev->dev, "RTC power up reset detected\n"); - rtc_write(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_POWER_UP); + + mask = OMAP_RTC_STATUS_ALARM; + + if (rtc->type->has_power_up_reset) { + mask |= OMAP_RTC_STATUS_POWER_UP; + if (reg & OMAP_RTC_STATUS_POWER_UP) + dev_info(&pdev->dev, "RTC power up reset detected\n"); } - if (reg & (u8) OMAP_RTC_STATUS_ALARM) - rtc_write(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_ALARM); + + if (reg & mask) + rtc_write(rtc, OMAP_RTC_STATUS_REG, reg & mask); /* On boards with split power, RTC_ON_NOFF won't reset the RTC */ reg = rtc_read(rtc, OMAP_RTC_CTRL_REG); |