On 1/27/2019 10:54 PM, Billy Laws wrote: > >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. Yeah this patch doesn't have support to program LBHYST & LBDAC because according to our experiences, we don't have requirement to modify them when low battery monitor support added. I think we can create a new patch to support these 2 fields in the future when we really need them. Or you can create a patch if you have requirement for them, is this OK to you Billy? Mark > > See: https://datasheetspdf.com/pdf-file/924230/Maxim/MAX8698C/1 ; pg 46 > >Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> > >Signed-off-by: Venkat Reddy Talla <vreddytalla@xxxxxxxxxx> > >Signed-off-by: Mark Zhang <markz@xxxxxxxxxx> > >--- > > 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) { >
