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

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Date:   Mon, 20 May 2019 11:07:11 -0700
From:   "Angus Ainslie (Purism)" <angus@...ea.ca>
To:     angus.ainslie@...i.sm
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Kuzmenko <eric.kuzmenko@...i.sm>,
        Angus Ainslie <angus@...ea.ca>
Subject: [PATCH 1/2] power: supply: bq25890: Add support for setting bq25890 and bq25896's VINDPM

From: Eric Kuzmenko <eric.kuzmenko@...i.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.kuzmenko@...i.sm>
Signed-off-by: Angus Ainslie (Purism) <angus@...ea.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