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SubjectRe: [2/2] mfd: max77620: Add low battery monitor support
It does, see this article
https://blog.quendi.moe/2018/07/03/en-debugging-nintendo-switch-linux-power-management-battery-desync-edition/


On Tue, Jan 29, 2019 at 9:03 AM Mark Zhang <markz@nvidia.com> wrote:
>
> On 1/29/2019 3:36 PM, Billy Laws wrote:
> > Sure, that's fine with me, will send then this gets accepted. Two
> > other things: you should probably set the reg to 0 if the property
> > isn't specified as regmap_add_irqchip sets it to 0xff (basically all
> > enabled on highest limit), and you haven't updated the dt-bindings.
>
> Billy, v2 is out, dt-bindings patches are added.
> But after a second thought, I don't think regmap_add_irqchip might set
> registers to 0xff. I mean, for 2 registers which this patch set touches,
> they're not IRQ registers(mask/status/...), so regmap_add_irqchip should
> not touch them so I didn't make changes to driver codes in v2.
>
> Mark
>
> >
> > On Tue, Jan 29, 2019 at 6:52 AM Mark Zhang <markz@nvidia.com> wrote:
> >>
> >> 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@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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