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51 lines
1.4 KiB
Diff
51 lines
1.4 KiB
Diff
From fb4e195012c405a04b1a7a86e240ceada0c8aa65 Mon Sep 17 00:00:00 2001
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From: Phil Howard <phil@gadgetoid.com>
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Date: Fri, 29 Mar 2019 10:53:14 +0000
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Subject: [PATCH] rtc: rv3028: Add backup switchover mode support
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Signed-off-by: Phil Howard <phil@pimoroni.com>
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---
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drivers/rtc/rtc-rv3028.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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--- a/drivers/rtc/rtc-rv3028.c
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+++ b/drivers/rtc/rtc-rv3028.c
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@@ -74,6 +74,7 @@
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#define RV3028_BACKUP_TCE BIT(5)
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#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
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+#define RV3028_BACKUP_BSM_MASK 0x0C
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#define OFFSET_STEP_PPT 953674
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@@ -601,6 +602,7 @@ static int rv3028_probe(struct i2c_clien
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struct rv3028_data *rv3028;
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int ret, status;
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u32 ohms;
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+ u8 bsm;
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struct nvmem_config nvmem_cfg = {
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.name = "rv3028_nvram",
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.word_size = 1,
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@@ -671,6 +673,21 @@ static int rv3028_probe(struct i2c_clien
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if (ret)
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return ret;
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+ /* setup backup switchover mode */
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+ if (!device_property_read_u8(&client->dev, "backup-switchover-mode",
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+ &bsm)) {
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+ if (bsm <= 3) {
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+ ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP,
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+ RV3028_BACKUP_BSM_MASK,
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+ (bsm & 0x03) << 2);
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+
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+ if (ret)
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+ return ret;
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+ } else {
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+ dev_warn(&client->dev, "invalid backup switchover mode value\n");
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+ }
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+ }
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+
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/* setup trickle charger */
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if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
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&ohms)) {
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