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rtc: ds1307: enable rx8130's backup battery, make it chargeable optionally

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The ds1307 charger infrastructure now allows to add a rx8130 charger
setup that..

- does not depend on trickle-resistor-ohms
- does not use DS13XX_TRICKLE_CHARGER_MAGIC trickle-charge select (TCS)
  bits
- keeps previous no-charge behavior for device trees without
  aux-voltage-chargeable

Make that happen.

Signed-off-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200917183246.19446-9-bst@pengutronix.de
This commit is contained in:
Bastian Krause 2020-09-17 20:32:46 +02:00 committed by Alexandre Belloni
parent 0874734e09
commit 0026f1604c
1 changed files with 15 additions and 0 deletions
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15
drivers/rtc/rtc-ds1307.c
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@ -122,6 +122,9 @@ enum ds_type {
#define RX8130_REG_FLAG_AF BIT(3)
#define RX8130_REG_CONTROL0 0x1e
#define RX8130_REG_CONTROL0_AIE BIT(3)
#define RX8130_REG_CONTROL1 0x1f
#define RX8130_REG_CONTROL1_INIEN BIT(4)
#define RX8130_REG_CONTROL1_CHGEN BIT(5)
#define MCP794XX_REG_CONTROL 0x07
# define MCP794XX_BIT_ALM0_EN 0x10
@ -541,6 +544,16 @@ static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307, u32 ohms, bool diode)
return setup;
}
static u8 do_trickle_setup_rx8130(struct ds1307 *ds1307, u32 ohms, bool diode)
{
/* make sure that the backup battery is enabled */
u8 setup = RX8130_REG_CONTROL1_INIEN;
if (diode)
setup |= RX8130_REG_CONTROL1_CHGEN;
return setup;
}
static irqreturn_t rx8130_irq(int irq, void *dev_id)
{
struct ds1307 *ds1307 = dev_id;
@ -1029,6 +1042,8 @@ static const struct chip_desc chips[last_ds_type] = {
.offset = 0x10,
.irq_handler = rx8130_irq,
.rtc_ops = &rx8130_rtc_ops,
.trickle_charger_reg = RX8130_REG_CONTROL1,
.do_trickle_setup = &do_trickle_setup_rx8130,
},
[m41t0] = {
.rtc_ops = &m41txx_rtc_ops,