[PATCH 1/2] power: supply: bq25890: Add support for setting bq25890 and bq25896's VINDPM

[Angus Ainslie (Purism)]

From: Eric Kuzmenko <eric.kuzme...@puri.sm>

The bq25890 has low voltage protection on VIN. Allow the register
to be set from the device tree.

Signed-off-by: Eric Kuzmenko <eric.kuzme...@puri.sm>
Signed-off-by: Angus Ainslie (Purism) <an...@akkea.ca>
---
 drivers/power/supply/bq25890_charger.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/bq25890_charger.c 
b/drivers/power/supply/bq25890_charger.c
index 66991e6f75d9..34fc89776994 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -75,6 +75,8 @@ struct bq25890_init_data {
        u8 boosti;      /* boost current limit          */
        u8 boostf;      /* boost frequency              */
        u8 ilim_en;     /* enable ILIM pin              */
+       u8 force_vindpm;/* force vinmin threshold       */
+       u8 vindpm;      /* vinmin threshold             */
        u8 treg;        /* thermal regulation threshold */
 };
 
@@ -250,6 +252,7 @@ enum bq25890_table_ids {
        TBL_VREG,
        TBL_BOOSTV,
        TBL_SYSVMIN,
+       TBL_VINDPM,
 
        /* lookup tables */
        TBL_TREG,
@@ -289,6 +292,7 @@ static const union {
        [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
        [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
        [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
+       [TBL_VINDPM] =  { .rt = {2600000, 15300000, 100000} },   /* uV */
 
        /* lookup tables */
        [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
@@ -621,6 +625,8 @@ static int bq25890_hw_init(struct bq25890_device *bq)
                {F_BOOSTI,       bq->init_data.boosti},
                {F_BOOSTF,       bq->init_data.boostf},
                {F_EN_ILIM,      bq->init_data.ilim_en},
+               {F_FORCE_VINDPM, bq->init_data.force_vindpm},
+               {F_VINDPM,       bq->init_data.vindpm},
                {F_TREG,         bq->init_data.treg}
        };
 
@@ -783,11 +789,14 @@ static int bq25890_fw_read_u32_props(struct 
bq25890_device *bq)
                {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 
                /* optional properties */
-               {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
+               {"ti,thermal-regulation-threshold",
+                       true, TBL_TREG, &init->treg},
+               {"ti,vinmin-threshold", true, TBL_VINDPM, &init->vindpm}
        };
 
        /* initialize data for optional properties */
        init->treg = 3; /* 120 degrees Celsius */
+       init->vindpm = 0x12; /* 4.4V */
 
        for (i = 0; i < ARRAY_SIZE(props); i++) {
                ret = device_property_read_u32(bq->dev, props[i].name,
@@ -820,6 +829,8 @@ static int bq25890_fw_probe(struct bq25890_device *bq)
 
        init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
        init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
+       init->force_vindpm =
+               device_property_read_bool(bq->dev, "ti,use-vinmin-threshold");
 
        return 0;
 }
-- 
2.17.1