Messages in this thread | | | From | Billy Laws <> | Subject | Re: [2/2] mfd: max77620: Add low battery monitor support | Date | Sun, 27 Jan 2019 14:54:57 +0000 |
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>This patch adds PMIC configurations for low-battery >monitoring by handling max77620 register CNFGGLBL1. > It might be an idea to add lbhyst configuration here and support using custom lbdac values to specify a different cutoff point.
See: https://datasheetspdf.com/pdf-file/924230/Maxim/MAX8698C/1 pg 46 >Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> >Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com> >Signed-off-by: Mark Zhang <markz@nvidia.com> >--- > drivers/mfd/max77620.c | 57 +++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 56 insertions(+), 1 deletion(-) > >diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c >index f58143103185..9e50d145afd8 100644 >--- a/drivers/mfd/max77620.c >+++ b/drivers/mfd/max77620.c >@@ -474,6 +474,57 @@ static int max77620_init_backup_battery_charging(struct max77620_chip *chip) > return ret; > } > >+static int max77620_init_low_battery_monitor(struct max77620_chip *chip) >+{ >+ struct device *dev = chip->dev; >+ struct device_node *np; >+ bool pval; >+ u8 mask = 0; >+ u8 val = 0; >+ int ret; >+ >+ np = of_get_child_by_name(dev->of_node, "low-battery-monitor"); >+ if (!np) { >+ dev_info(dev, "Low battery monitoring support disabled\n"); >+ return 0; >+ } >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-dac-enable"); >+ if (pval) { >+ mask |= MAX77620_CNFGGLBL1_LBDAC_EN; >+ val |= MAX77620_CNFGGLBL1_LBDAC_EN; >+ } >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-dac-disable"); >+ if (pval) >+ mask |= MAX77620_CNFGGLBL1_LBDAC_EN; >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-shutdown-enable"); >+ if (pval) { >+ mask |= MAX77620_CNFGGLBL1_MPPLD; >+ val |= MAX77620_CNFGGLBL1_MPPLD; >+ } >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-shutdown-disable"); >+ if (pval) >+ mask |= MAX77620_CNFGGLBL1_MPPLD; >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-reset-enable"); >+ if (pval) { >+ mask |= MAX77620_CNFGGLBL1_LBRSTEN; >+ val |= MAX77620_CNFGGLBL1_LBRSTEN; >+ } >+ >+ pval = of_property_read_bool(np, "maxim,low-battery-reset-disable"); >+ if (pval) >+ mask |= MAX77620_CNFGGLBL1_LBRSTEN; >+ >+ ret = regmap_update_bits(chip->rmap, MAX77620_REG_CNFGGLBL1, mask, val); >+ if (ret < 0) >+ dev_err(dev, "Reg CNFGGLBL1 update failed: %d\n", ret); >+ return ret; >+} >+ > static int max77620_read_es_version(struct max77620_chip *chip) > { > unsigned int val; >@@ -563,7 +614,11 @@ static int max77620_probe(struct i2c_client *client, > if (ret < 0) > return ret; > >- ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, >+ ret = max77620_init_low_battery_monitor(chip); >+ if (ret < 0) >+ return ret; >+ >+ ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, > mfd_cells, n_mfd_cells, NULL, 0, > regmap_irq_get_domain(chip->top_irq_data)); > if (ret < 0) {
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