power: supply: bq25890: support IBAT compensation

Add configuration for compensation of IBAT measuring resistor in series
with the battery.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 7715066..ab8398f 100644 (file)
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -83,6 +83,8 @@ struct bq25890_init_data {
        u8 boostf;      /* boost frequency              */
        u8 ilim_en;     /* enable ILIM pin              */
        u8 treg;        /* thermal regulation threshold */
+       u8 rbatcomp;    /* IBAT sense resistor value    */
+       u8 vclamp;      /* IBAT compensation voltage limit */
 };
 
 struct bq25890_state {
@@ -258,6 +260,8 @@ enum bq25890_table_ids {
        TBL_VREG,
        TBL_BOOSTV,
        TBL_SYSVMIN,
+       TBL_VBATCOMP,
+       TBL_RBATCOMP,
 
        /* lookup tables */
        TBL_TREG,
@@ -299,6 +303,8 @@ 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_VBATCOMP] ={ .rt = {0,        224000, 32000} },     /* uV */
+       [TBL_RBATCOMP] ={ .rt = {0,        140000, 20000} },     /* uOhm */
 
        /* lookup tables */
        [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
@@ -648,7 +654,9 @@ 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_TREG,         bq->init_data.treg}
+               {F_TREG,         bq->init_data.treg},
+               {F_BATCMP,       bq->init_data.rbatcomp},
+               {F_VCLAMP,       bq->init_data.vclamp},
        };
 
        ret = bq25890_chip_reset(bq);
@@ -859,11 +867,14 @@ 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,ibatcomp-micro-ohms", true, TBL_RBATCOMP, &init->rbatcomp},
+               {"ti,ibatcomp-clamp-microvolt", true, TBL_VBATCOMP, &init->vclamp},
        };
 
        /* initialize data for optional properties */
        init->treg = 3; /* 120 degrees Celsius */
+       init->rbatcomp = init->vclamp = 0; /* IBAT compensation disabled */
 
        for (i = 0; i < ARRAY_SIZE(props); i++) {
                ret = device_property_read_u32(bq->dev, props[i].name,