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rtc: ds1307: introduce requires_trickle_resistor per chip

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Make trickle-resistor-ohms optional for charging setups that do not
require specifying ROUT bits (specifying the resistor value between Vcc
and Vbackup). In order to allow specifying that, introduce
requires_trickle_resistor per chip.

Signed-off-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200917183246.19446-6-bst@pengutronix.de
This commit is contained in:
Bastian Krause 2020-09-17 20:32:43 +02:00 committed by Alexandre Belloni
parent 462eb736db
commit 1b5b6af788
1 changed files with 7 additions and 1 deletions
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8
drivers/rtc/rtc-ds1307.c
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@ -191,6 +191,10 @@ struct chip_desc {
u16 trickle_charger_reg;
u8 (*do_trickle_setup)(struct ds1307 *, u32,
bool);
/* Does the RTC require trickle-resistor-ohms to select the value of
* the resistor between Vcc and Vbackup?
*/
bool requires_trickle_resistor;
};
static const struct chip_desc chips[last_ds_type];
@ -986,6 +990,7 @@ static const struct chip_desc chips[last_ds_type] = {
.bbsqi_bit = DS1339_BIT_BBSQI,
.trickle_charger_reg = 0x10,
.do_trickle_setup = &do_trickle_setup_ds1339,
.requires_trickle_resistor = true,
},
[ds_1340] = {
.century_reg = DS1307_REG_HOUR,
@ -993,6 +998,7 @@ static const struct chip_desc chips[last_ds_type] = {
.century_bit = DS1340_BIT_CENTURY,
.do_trickle_setup = &do_trickle_setup_ds1339,
.trickle_charger_reg = 0x08,
.requires_trickle_resistor = true,
},
[ds_1341] = {
.century_reg = DS1307_REG_MONTH,
@ -1307,7 +1313,7 @@ static u8 ds1307_trickle_init(struct ds1307 *ds1307,
return 0;
if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms",
&ohms))
&ohms) && chip->requires_trickle_resistor)
return 0;
if (device_property_read_bool(ds1307->dev, "trickle-diode-disable"))