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SubjectRe: [PATCH v3 03/14] rtc: pcf2127: adapt for alarm registers at any offset
On Fri, 20 Jan 2023 18:10:36 +0100
Alexandre Belloni <alexandre.belloni@bootlin.com> wrote:

> On 15/12/2022 10:02:04-0500, Hugo Villeneuve wrote:
> > From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
> >
> > This will simplify the implementation of new variants into this driver.
> >
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
> > ---
> > drivers/rtc/rtc-pcf2127.c | 42 ++++++++++++++++++++++-----------------
> > 1 file changed, 24 insertions(+), 18 deletions(-)
> >
> > diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> > index fb0caacaabee..db0cb784c0c9 100644
> > --- a/drivers/rtc/rtc-pcf2127.c
> > +++ b/drivers/rtc/rtc-pcf2127.c
> > @@ -56,11 +56,14 @@
> > /* Time and date registers bits */
> > #define PCF2127_BIT_SC_OSF BIT(7)
> > /* Alarm registers */
> > -#define PCF2127_REG_ALARM_SC 0x0A
> > -#define PCF2127_REG_ALARM_MN 0x0B
> > -#define PCF2127_REG_ALARM_HR 0x0C
> > -#define PCF2127_REG_ALARM_DM 0x0D
> > -#define PCF2127_REG_ALARM_DW 0x0E
> > +#define PCF2127_REG_ALARM_BASE 0x0A
> > +/* Alarm registers offsets (starting from base register) */
> > +#define PCF2127_OFFSET_ALARM_SC 0
> > +#define PCF2127_OFFSET_ALARM_MN 1
> > +#define PCF2127_OFFSET_ALARM_HR 2
> > +#define PCF2127_OFFSET_ALARM_DM 3
> > +#define PCF2127_OFFSET_ALARM_DW 4
> > +/* Alarm bits */
> > #define PCF2127_BIT_ALARM_AE BIT(7)
> > /* CLKOUT control register */
> > #define PCF2127_REG_CLKOUT 0x0f
> > @@ -110,6 +113,7 @@ struct pcf21xx_config {
> > unsigned int has_nvmem:1;
> > unsigned int has_bit_wd_ctl_cd0:1;
> > u8 regs_td_base; /* Time/data base registers. */
> > + u8 regs_alarm_base; /* Alarm function base registers. */
> > };
> >
> > struct pcf2127 {
> > @@ -402,18 +406,18 @@ static int pcf2127_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> > if (ret)
> > return ret;
> >
> > - ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf,
> > - sizeof(buf));
> > + ret = regmap_bulk_read(pcf2127->regmap, pcf2127->cfg->regs_alarm_base,
> > + buf, sizeof(buf));
> > if (ret)
> > return ret;
> >
> > alrm->enabled = ctrl2 & PCF2127_BIT_CTRL2_AIE;
> > alrm->pending = ctrl2 & PCF2127_BIT_CTRL2_AF;
> >
> > - alrm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
> > - alrm->time.tm_min = bcd2bin(buf[1] & 0x7F);
> > - alrm->time.tm_hour = bcd2bin(buf[2] & 0x3F);
> > - alrm->time.tm_mday = bcd2bin(buf[3] & 0x3F);
> > + alrm->time.tm_sec = bcd2bin(buf[PCF2127_OFFSET_ALARM_SC] & 0x7F);
> > + alrm->time.tm_min = bcd2bin(buf[PCF2127_OFFSET_ALARM_MN] & 0x7F);
> > + alrm->time.tm_hour = bcd2bin(buf[PCF2127_OFFSET_ALARM_HR] & 0x3F);
> > + alrm->time.tm_mday = bcd2bin(buf[PCF2127_OFFSET_ALARM_DM] & 0x3F);
>
> I feel like this is adding defines for the sake of having defines. I
> don't think this is particularly useful.

Ok, done.

>
>
> >
> > return 0;
> > }
> > @@ -447,14 +451,14 @@ static int pcf2127_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> > if (ret)
> > return ret;
> >
> > - buf[0] = bin2bcd(alrm->time.tm_sec);
> > - buf[1] = bin2bcd(alrm->time.tm_min);
> > - buf[2] = bin2bcd(alrm->time.tm_hour);
> > - buf[3] = bin2bcd(alrm->time.tm_mday);
> > - buf[4] = PCF2127_BIT_ALARM_AE; /* Do not match on week day */
> > + buf[PCF2127_OFFSET_ALARM_SC] = bin2bcd(alrm->time.tm_sec);
> > + buf[PCF2127_OFFSET_ALARM_MN] = bin2bcd(alrm->time.tm_min);
> > + buf[PCF2127_OFFSET_ALARM_HR] = bin2bcd(alrm->time.tm_hour);
> > + buf[PCF2127_OFFSET_ALARM_DM] = bin2bcd(alrm->time.tm_mday);
> > + buf[PCF2127_OFFSET_ALARM_DW] = PCF2127_BIT_ALARM_AE; /* Do not match on week day */
> >
> > - ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf,
> > - sizeof(buf));
> > + ret = regmap_bulk_write(pcf2127->regmap, pcf2127->cfg->regs_alarm_base,
> > + buf, sizeof(buf));
> > if (ret)
> > return ret;
> >
> > @@ -659,12 +663,14 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
> > .has_nvmem = 1,
> > .has_bit_wd_ctl_cd0 = 1,
> > .regs_td_base = PCF2127_REG_TIME_DATE_BASE,
> > + .regs_alarm_base = PCF2127_REG_ALARM_BASE,
> > },
> > [PCF2129] = {
> > .max_register = 0x19,
> > .has_nvmem = 0,
> > .has_bit_wd_ctl_cd0 = 0,
> > .regs_td_base = PCF2127_REG_TIME_DATE_BASE,
> > + .regs_alarm_base = PCF2127_REG_ALARM_BASE,
> > },
> > };
> >
> > --
> > 2.30.2
> >
>
> --
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>


--
Hugo Villeneuve <hugo@hugovil.com>

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