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rtc: omap: use rtc_write to access OMAP_RTC_OSC_REG 

The RTC_OSC_REG register is 32-bit, but the useful information is found
in the 7 least significant bits (bits 7-31 are reserved). And in fact,
as you can see from the code, all read accesses are 8-bit, as well as
some writes. Let's make sure all writes are 8-bit. Moreover, in contexts
where consecutive reads / writes after the busy check must take place
within 15 us, it is better not to waste time on useless accesses.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210425145924.23353-1-dariobin@libero.it
This commit is contained in:
Dario Binacchi 2021-04-25 16:59:23 +02:00 committed by Alexandre Belloni
parent fefbec3a74
commit e463786f38
1 changed files with 2 additions and 3 deletions
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5
drivers/rtc/rtc-omap.c
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@ -786,8 +786,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
/* enable RTC functional clock */
if (rtc->type->has_32kclk_en) {
reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
rtc_writel(rtc, OMAP_RTC_OSC_REG,
reg | OMAP_RTC_OSC_32KCLK_EN);
rtc_write(rtc, OMAP_RTC_OSC_REG, reg | OMAP_RTC_OSC_32KCLK_EN);
}
/* clear old status */
@ -845,7 +844,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
reg &= ~OMAP_RTC_OSC_OSC32K_GZ_DISABLE;
reg |= OMAP_RTC_OSC_32KCLK_EN | OMAP_RTC_OSC_SEL_32KCLK_SRC;
rtc_writel(rtc, OMAP_RTC_OSC_REG, reg);
rtc_write(rtc, OMAP_RTC_OSC_REG, reg);
}
rtc->type->lock(rtc);