target/linux/bcm27xx/patches-4.19/950-0366-rtc-rv3028-Add-backup-switchover-mode-support.patch

   1 From fb4e195012c405a04b1a7a86e240ceada0c8aa65 Mon Sep 17 00:00:00 2001
   2 From: Phil Howard <phil@gadgetoid.com>
   3 Date: Fri, 29 Mar 2019 10:53:14 +0000
   4 Subject: [PATCH] rtc: rv3028: Add backup switchover mode support
   5
   6 Signed-off-by: Phil Howard <phil@pimoroni.com>
   7 ---
   8  drivers/rtc/rtc-rv3028.c | 17 +++++++++++++++++
   9  1 file changed, 17 insertions(+)
  10
  11 --- a/drivers/rtc/rtc-rv3028.c
  12 +++ b/drivers/rtc/rtc-rv3028.c
  13 @@ -74,6 +74,7 @@
  14
  15  #define RV3028_BACKUP_TCE              BIT(5)
  16  #define RV3028_BACKUP_TCR_MASK         GENMASK(1,0)
  17 +#define RV3028_BACKUP_BSM_MASK         0x0C
  18
  19  #define OFFSET_STEP_PPT                        953674
  20
  21 @@ -601,6 +602,7 @@ static int rv3028_probe(struct i2c_clien
  22         struct rv3028_data *rv3028;
  23         int ret, status;
  24         u32 ohms;
  25 +       u8 bsm;
  26         struct nvmem_config nvmem_cfg = {
  27                 .name = "rv3028_nvram",
  28                 .word_size = 1,
  29 @@ -671,6 +673,21 @@ static int rv3028_probe(struct i2c_clien
  30         if (ret)
  31                 return ret;
  32
  33 +       /* setup backup switchover mode */
  34 +       if (!device_property_read_u8(&client->dev, "backup-switchover-mode",
  35 +                                    &bsm))  {
  36 +               if (bsm <= 3) {
  37 +                       ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP,
  38 +                               RV3028_BACKUP_BSM_MASK,
  39 +                               (bsm & 0x03) << 2);
  40 +
  41 +                       if (ret)
  42 +                               return ret;
  43 +               } else {
  44 +                       dev_warn(&client->dev, "invalid backup switchover mode value\n");
  45 +               }
  46 +       }
  47 +
  48         /* setup trickle charger */
  49         if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
  50                                       &ohms)) {