mirror of
https://github.com/Ysurac/openmptcprouter.git
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82 lines
2.4 KiB
Diff
82 lines
2.4 KiB
Diff
From 94f04c39cfc6192c333516cda1a593c140786147 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 | 45 +++++++++++++++++++++++++++++++++++-----
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1 file changed, 40 insertions(+), 5 deletions(-)
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--- a/drivers/rtc/rtc-rv3028.c
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+++ b/drivers/rtc/rtc-rv3028.c
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@@ -860,6 +860,8 @@ 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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+ u32 bsm;
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+ u8 backup, backup_bits, backup_mask;
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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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@@ -926,6 +928,21 @@ static int rv3028_probe(struct i2c_clien
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if (ret)
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return ret;
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+ backup_bits = 0;
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+ backup_mask = 0;
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+
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+ /* setup backup switchover mode */
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+ if (!device_property_read_u32(&client->dev,
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+ "backup-switchover-mode",
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+ &bsm)) {
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+ if (bsm <= 3) {
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+ backup_bits |= (u8)(bsm << 2);
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+ backup_mask |= RV3028_BACKUP_BSM;
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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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@@ -936,15 +953,33 @@ static int rv3028_probe(struct i2c_clien
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break;
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if (i < ARRAY_SIZE(rv3028_trickle_resistors)) {
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- ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_TCE |
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- RV3028_BACKUP_TCR_MASK, RV3028_BACKUP_TCE | i);
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- if (ret)
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- return ret;
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+ backup_bits |= RV3028_BACKUP_TCE | i;
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+ backup_mask |= RV3028_BACKUP_TCE |
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+ RV3028_BACKUP_TCR_MASK;
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} else {
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- dev_warn(&client->dev, "invalid trickle resistor value\n");
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+ dev_warn(&client->dev,
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+ "invalid trickle resistor value\n");
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}
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}
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+ if (backup_mask) {
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+ ret = rv3028_eeprom_read((void *)rv3028, RV3028_BACKUP,
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+ (void *)&backup, 1);
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+ /* Write register and EEPROM if needed */
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+ if (!ret && (backup & backup_mask) != backup_bits) {
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+ backup = (backup & ~backup_mask) | backup_bits;
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+ ret = rv3028_update_cfg(rv3028, RV3028_BACKUP,
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+ backup_mask, backup_bits);
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+ }
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+
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+ /* In the event of an EEPROM failure, just update the register */
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+ if (ret)
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+ ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP,
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+ backup_mask, backup_bits);
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+ if (ret)
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+ return ret;
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+ }
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+
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ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group);
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if (ret)
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return ret;
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