From mboxrd@z Thu Jan 1 00:00:00 1970 From: johan@kernel.org (Johan Hovold) Date: Tue, 21 Oct 2014 19:37:47 +0200 Subject: [PATCH v2 01/20] rtc: omap: fix clock-source configuration In-Reply-To: <1413913086-12730-1-git-send-email-johan@kernel.org> References: <1412881594-25678-1-git-send-email-johan@kernel.org> <1413913086-12730-1-git-send-email-johan@kernel.org> Message-ID: <1413913086-12730-2-git-send-email-johan@kernel.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Make sure not to reset the clock-source configuration when enabling the 32kHz clock mux. Until the clock source can be configured through device tree we must not overwrite settings made by the bootloader (e.g. clock-source selection). Fixes: cd914bba03d8 ("drivers/rtc/rtc-omap.c: add support for enabling 32khz clock") Cc: stable Reviewed-by: Felipe Balbi Signed-off-by: Johan Hovold --- drivers/rtc/rtc-omap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 21142e6574a9..f842c216f2dd 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -431,8 +431,10 @@ static int __init omap_rtc_probe(struct platform_device *pdev) rtc_write(0, OMAP_RTC_INTERRUPTS_REG); /* enable RTC functional clock */ - if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN) - rtc_writel(OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG); + if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN) { + reg = rtc_read(OMAP_RTC_OSC_REG); + rtc_writel(reg | OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG); + } /* clear old status */ reg = rtc_read(OMAP_RTC_STATUS_REG); -- 2.0.4