linux-kernel - Re: [PATCH v3 08/14] rtc: pcf2127: add support for PCF2131 interrupts on output INT

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Date:   Sat, 7 Jan 2023 19:17:57 +0100
From:   Bruno Thomsen <bruno.thomsen@...il.com>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>
Subject: Re: [PATCH v3 08/14] rtc: pcf2127: add support for PCF2131 interrupts
 on output INT_A

Den tor. 15. dec. 2022 kl. 16.20 skrev Hugo Villeneuve <hugo@...ovil.com>:
>
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
>
> The PCF2127 and PCF2129 have one output interrupt pin. The PCF2131 has
> two, named INT_A and INT_B. The hardware support that any interrupt
> source can be routed to either one or both of them.
>
> Force all interrupt sources to go to the INT A pin.
>
> Support to route any interrupt source to INT A/B pins is not supported
> by this driver at the moment.
>
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>

Reviewed-by: Bruno Thomsen <bruno.thomsen@...il.com>

> ---
>  drivers/rtc/rtc-pcf2127.c | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
>
> diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> index 4148e135f935..68af4d0438b8 100644
> --- a/drivers/rtc/rtc-pcf2127.c
> +++ b/drivers/rtc/rtc-pcf2127.c
> @@ -191,6 +191,7 @@ struct pcf21xx_config {
>         int max_register;
>         unsigned int has_nvmem:1;
>         unsigned int has_bit_wd_ctl_cd0:1;
> +       unsigned int has_int_a_b:1; /* PCF2131 supports two interrupt outputs. */
>         u8 regs_td_base; /* Time/data base registers. */
>         u8 regs_alarm_base; /* Alarm function base registers. */
>         u8 reg_wd_ctl; /* Watchdog control register. */
> @@ -879,6 +880,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
>                 .max_register = 0x1d,
>                 .has_nvmem = 1,
>                 .has_bit_wd_ctl_cd0 = 1,
> +               .has_int_a_b = 0,
>                 .regs_td_base = PCF2127_REG_TIME_DATE_BASE,
>                 .regs_alarm_base = PCF2127_REG_ALARM_BASE,
>                 .reg_wd_ctl = PCF2127_REG_WD_CTL,
> @@ -902,6 +904,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
>                 .max_register = 0x19,
>                 .has_nvmem = 0,
>                 .has_bit_wd_ctl_cd0 = 0,
> +               .has_int_a_b = 0,
>                 .regs_td_base = PCF2127_REG_TIME_DATE_BASE,
>                 .regs_alarm_base = PCF2127_REG_ALARM_BASE,
>                 .reg_wd_ctl = PCF2127_REG_WD_CTL,
> @@ -925,6 +928,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
>                 .max_register = 0x36,
>                 .has_nvmem = 0,
>                 .has_bit_wd_ctl_cd0 = 0,
> +               .has_int_a_b = 1,
>                 .regs_td_base = PCF2131_REG_TIME_DATE_BASE,
>                 .regs_alarm_base = PCF2131_REG_ALARM_BASE,
>                 .reg_wd_ctl = PCF2131_REG_WD_CTL,
> @@ -1017,6 +1021,28 @@ static int pcf2127_enable_ts(struct device *dev, int ts_id)
>         return ret;
>  }
>
> +/* Route all interrupt sources to INT A pin. */
> +static int pcf2127_configure_interrupt_pins(struct device *dev)
> +{
> +       struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
> +       int ret;
> +
> +       /* Mask bits need to be cleared to enable corresponding
> +        * interrupt source.
> +        */
> +       ret = regmap_write(pcf2127->regmap,
> +                          PCF2131_REG_INT_A_MASK1, 0);
> +       if (ret)
> +               return ret;
> +
> +       ret = regmap_write(pcf2127->regmap,
> +                          PCF2131_REG_INT_A_MASK2, 0);
> +       if (ret)
> +               return ret;
> +
> +       return ret;
> +}
> +
>  static int pcf2127_probe(struct device *dev, struct regmap *regmap,
>                          int alarm_irq, const char *name, const struct pcf21xx_config *config)
>  {
> @@ -1076,6 +1102,15 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
>                 set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
>         }
>
> +       if (pcf2127->cfg->has_int_a_b) {
> +               /* Configure int A/B pins, independently of alarm_irq. */
> +               ret = pcf2127_configure_interrupt_pins(dev);
> +               if (ret) {
> +                       dev_err(dev, "failed to configure interrupt pins\n");
> +                       return ret;
> +               }
> +       }
> +
>         if (pcf2127->cfg->has_nvmem) {
>                 struct nvmem_config nvmem_cfg = {
>                         .priv = pcf2127,
> --
> 2.30.2
>