[PATCH 06/13] power: supply: bq25890: Add support for skipping initialization

Hans de Goede
2021-10-30T18:28:48Z

On most X86/ACPI devices there is no devicetree to supply the necessary
init-data. Instead the firmware already fully initializes the bq25890
charger at boot.

At support for a new "ti,skip-init" boolean property to support this.
So far this new property is only used on X86/ACPI (non devicetree) devs,
IOW it is not used in actual devicetree files. The devicetree-bindings
maintainers have requested properties like these to not be added to the
devicetree-bindings, so the new property is deliberately not added
to the existing devicetree-bindings.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/power/supply/bq25890_charger.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 1ec93a565631..280821a6a6c6 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -73,6 +73,7 @@ enum bq25890_fields {

/* initial field values, converted to register values */
struct bq25890_init_data {
+ u8 write_cfg; /* write firmware cfg to chip? */
u8 ichg; /* charge current */
u8 vreg; /* regulation voltage */
u8 iterm; /* termination current */
@@ -638,7 +639,7 @@ static int bq25890_chip_reset(struct bq25890_device *bq)

static int bq25890_rw_init_data(struct bq25890_device *bq)
{
- bool write = true;
+ bool write = bq->init_data.write_cfg;
int ret;
int i;

@@ -682,10 +683,12 @@ static int bq25890_hw_init(struct bq25890_device *bq)
{
int ret;

- ret = bq25890_chip_reset(bq);
- if (ret < 0) {
- dev_dbg(bq->dev, "Reset failed %d\n", ret);
- return ret;
+ if (bq->init_data.write_cfg) {
+ ret = bq25890_chip_reset(bq);
+ if (ret < 0) {
+ dev_dbg(bq->dev, "Reset failed %d\n", ret);
+ return ret;
+ }
}

/* disable watchdog */
@@ -920,6 +923,10 @@ static int bq25890_fw_probe(struct bq25890_device *bq)
int ret;
struct bq25890_init_data *init = &bq->init_data;

+ init->write_cfg = !device_property_read_bool(bq->dev, "ti,skip-init");
+ if (!init->write_cfg)
+ return 0;
+
ret = bq25890_fw_read_u32_props(bq);
if (ret < 0)
return ret;
@@ -1033,8 +1040,10 @@ static int bq25890_remove(struct i2c_client *client)
if (!IS_ERR_OR_NULL(bq->usb_phy))
usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);

- /* reset all registers to default values */
- bq25890_chip_reset(bq);
+ if (bq->init_data.write_cfg) {
+ /* reset all registers to default values */
+ bq25890_chip_reset(bq);
+ }

return 0;
}
--
2.31.1