çå: [2/2] mfd: max77620: Add low battery monitor support

[Mark Zhang]

Oh yeah will do, thanks.

-----éäåä-----
åää: Billy Laws <blaws05@xxxxxxxxx> 
åéæé: Tuesday, January 29, 2019 3:36 PM
æää: Mark Zhang <markz@xxxxxxxxxx>
æé: Lee Jones <lee.jones@xxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; linux-tegra@xxxxxxxxxxxxxxx; Laxman Dewangan <ldewangan@xxxxxxxxxx>; Venkat Reddy Talla <vreddytalla@xxxxxxxxxx>
äé: Re: [2/2] mfd: max77620: Add low battery monitor support

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.

On Tue, Jan 29, 2019 at 6:52 AM Mark Zhang <markz@xxxxxxxxxx> 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@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) {
> >