target/linux/generic/pending-5.10/191-rtc-rs5c372-let_the_alarm_to_be_used_as_wakeup_source.patch

   1 From: Daniel González Cabanelas <dgcbueu@gmail.com>
   2 Subject: [PATCH 2/2] rtc: rs5c372: let the alarm to be used as wakeup source
   3
   4 Currently there is no use for the interrupts on the rs5c372 RTC and the
   5 wakealarm isn't enabled. There are some devices like NASes which use this
   6 RTC to wake up from the power off state when the INTR pin is activated by
   7 the alarm clock.
   8
   9 Enable the alarm and let to be used as a wakeup source.
  10
  11 Tested on a Buffalo LS421DE NAS.
  12
  13 Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
  14 ---
  15  drivers/rtc/rtc-rs5c372.c | 16 ++++++++++++++++
  16  1 file changed, 16 insertions(+)
  17
  18 --- a/drivers/rtc/rtc-rs5c372.c
  19 +++ b/drivers/rtc/rtc-rs5c372.c
  20 @@ -654,6 +654,7 @@ static int rs5c372_probe(struct i2c_clie
  21         int err = 0;
  22         int smbus_mode = 0;
  23         struct rs5c372 *rs5c372;
  24 +       bool rs5c372_can_wakeup_device = false;
  25
  26         dev_dbg(&client->dev, "%s\n", __func__);
  27
  28 @@ -689,6 +690,12 @@ static int rs5c372_probe(struct i2c_clie
  29         else
  30                 rs5c372->type = id->driver_data;
  31
  32 +#ifdef CONFIG_OF
  33 +       if(of_property_read_bool(client->dev.of_node,
  34 +                                             "wakeup-source"))
  35 +               rs5c372_can_wakeup_device = true;
  36 +#endif
  37 +
  38         /* we read registers 0x0f then 0x00-0x0f; skip the first one */
  39         rs5c372->regs = &rs5c372->buf[1];
  40         rs5c372->smbus = smbus_mode;
  41 @@ -722,6 +729,8 @@ static int rs5c372_probe(struct i2c_clie
  42                 goto exit;
  43         }
  44
  45 +       rs5c372->has_irq = 1;
  46 +
  47         /* if the oscillator lost power and no other software (like
  48          * the bootloader) set it up, do it here.
  49          *
  50 @@ -748,6 +757,10 @@ static int rs5c372_probe(struct i2c_clie
  51                         );
  52
  53         /* REVISIT use client->irq to register alarm irq ... */
  54 +       if (rs5c372_can_wakeup_device) {
  55 +               device_init_wakeup(&client->dev, true);
  56 +       }
  57 +
  58         rs5c372->rtc = devm_rtc_device_register(&client->dev,
  59                                         rs5c372_driver.driver.name,
  60                                         &rs5c372_rtc_ops, THIS_MODULE);
  61 @@ -761,6 +774,9 @@ static int rs5c372_probe(struct i2c_clie
  62         if (err)
  63                 goto exit;
  64
  65 +       /* the rs5c372 alarm only supports a minute accuracy */
  66 +       rs5c372->rtc->uie_unsupported = 1;
  67 +
  68         return 0;
  69
  70  exit: