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From c91a8597734d13ebb5ac7393fa6f100d70f15664 Mon Sep 17 00:00:00 2001
From: Phil Howard <phil@gadgetoid.com>
Date: Fri, 29 Mar 2019 10:53:14 +0000
Subject: [PATCH] rtc: rv3028: Add backup switchover mode support
Signed-off-by: Phil Howard <phil@pimoroni.com>
---
drivers/rtc/rtc-rv3028.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- a/drivers/rtc/rtc-rv3028.c
+++ b/drivers/rtc/rtc-rv3028.c
@@ -73,6 +73,7 @@
#define RV3028_BACKUP_TCE BIT(5)
#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
+#define RV3028_BACKUP_BSM_MASK 0x0C
#define OFFSET_STEP_PPT 953674
@@ -600,6 +601,7 @@ static int rv3028_probe(struct i2c_clien
struct rv3028_data *rv3028;
int ret, status;
u32 ohms;
+ u8 bsm;
struct nvmem_config nvmem_cfg = {
.name = "rv3028_nvram",
.word_size = 1,
@@ -671,6 +673,21 @@ static int rv3028_probe(struct i2c_clien
if (ret)
return ret;
+ /* setup backup switchover mode */
+ if (!device_property_read_u8(&client->dev, "backup-switchover-mode",
+ &bsm)) {
+ if (bsm <= 3) {
+ ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP,
+ RV3028_BACKUP_BSM_MASK,
+ (bsm & 0x03) << 2);
+
+ if (ret)
+ return ret;
+ } else {
+ dev_warn(&client->dev, "invalid backup switchover mode value\n");
+ }
+ }
+
/* setup trickle charger */
if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
&ohms)) {
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