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Date: Tue, 4 Jul 2017 15:20:41 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc: Felipe Balbi <balbi@...nel.org>,
Greg KH <gregkh@...uxfoundation.org>, Jun Li <jun.li@....com>,
Peter Chen <peter.chen@...escale.com>,
Mark Brown <broonie@...nel.org>,
John Stultz <john.stultz@...aro.org>,
NeilBrown <neilb@...e.com>, patches@...nsource.wolfsonmicro.com,
Linux PM list <linux-pm@...r.kernel.org>,
USB <linux-usb@...r.kernel.org>,
device-mainlining@...ts.linuxfoundation.org,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] power: wm831x_power: Support USB charger current
limit management
Hi,
On 3 July 2017 at 23:50, Sebastian Reichel
<sebastian.reichel@...labora.co.uk> wrote:
> Hi,
>
> On Mon, Jul 03, 2017 at 02:07:15PM +0800, Baolin Wang wrote:
>> Integrate with the newly added USB charger interface to limit the current
>> we draw from the USB input based on the input device configuration
>> identified by the USB stack, allowing us to charge more quickly from high
>> current inputs without drawing more current than specified from others.
>>
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>
> Missing DT binding documentation, otherwise fine with me.
> Would be nice to convert existing drivers:
>
> $ git grep -l extcon -- drivers/power/supply
> drivers/power/supply/axp288_charger.c
> drivers/power/supply/bq24190_charger.c
> drivers/power/supply/charger-manager.c
> drivers/power/supply/qcom_smbb.c
I'll create new patches with adding the DT binding documentation if
there are no objections for USB phy modification, moreover I will help
to convert these drivers you listed. Thanks.
>
> -- Sebastian
>
>> ---
>> drivers/power/supply/wm831x_power.c | 61 +++++++++++++++++++++++++++++++++++
>> 1 file changed, 61 insertions(+)
>>
>> diff --git a/drivers/power/supply/wm831x_power.c b/drivers/power/supply/wm831x_power.c
>> index 7082301..3e3480708 100644
>> --- a/drivers/power/supply/wm831x_power.c
>> +++ b/drivers/power/supply/wm831x_power.c
>> @@ -13,6 +13,7 @@
>> #include <linux/platform_device.h>
>> #include <linux/power_supply.h>
>> #include <linux/slab.h>
>> +#include <linux/usb/phy.h>
>>
>> #include <linux/mfd/wm831x/core.h>
>> #include <linux/mfd/wm831x/auxadc.h>
>> @@ -31,6 +32,8 @@ struct wm831x_power {
>> char usb_name[20];
>> char battery_name[20];
>> bool have_battery;
>> + struct usb_phy *usb_phy;
>> + struct notifier_block usb_notify;
>> };
>>
>> static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
>> @@ -125,6 +128,43 @@ static int wm831x_usb_get_prop(struct power_supply *psy,
>> POWER_SUPPLY_PROP_VOLTAGE_NOW,
>> };
>>
>> +/* In milliamps */
>> +static const unsigned int wm831x_usb_limits[] = {
>> + 0,
>> + 2,
>> + 100,
>> + 500,
>> + 900,
>> + 1500,
>> + 1800,
>> + 550,
>> +};
>> +
>> +static int wm831x_usb_limit_change(struct notifier_block *nb,
>> + unsigned long limit, void *data)
>> +{
>> + struct wm831x_power *wm831x_power = container_of(nb,
>> + struct wm831x_power,
>> + usb_notify);
>> + unsigned int i, best;
>> +
>> + /* Find the highest supported limit */
>> + best = 0;
>> + for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
>> + if (limit >= wm831x_usb_limits[i] &&
>> + wm831x_usb_limits[best] < wm831x_usb_limits[i])
>> + best = i;
>> + }
>> +
>> + dev_dbg(wm831x_power->wm831x->dev,
>> + "Limiting USB current to %umA", wm831x_usb_limits[best]);
>> +
>> + wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
>> + WM831X_USB_ILIM_MASK, best);
>> +
>> + return 0;
>> +}
>> +
>> /*********************************************************************
>> * Battery properties
>> *********************************************************************/
>> @@ -607,6 +647,22 @@ static int wm831x_power_probe(struct platform_device *pdev)
>> }
>> }
>>
>> + power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev,
>> + "usb-phy", 0);
>> + if (IS_ERR(power->usb_phy)) {
>> + ret = PTR_ERR(power->usb_phy);
>> + dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret);
>> + goto err_bat_irq;
>> + }
>> +
>> + power->usb_notify.notifier_call = wm831x_usb_limit_change;
>> + ret = usb_register_notifier(power->usb_phy,
>> + &power->usb_notify);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
>> + goto err_bat_irq;
>> + }
>> +
>> return ret;
>>
>> err_bat_irq:
>> @@ -637,6 +693,11 @@ static int wm831x_power_remove(struct platform_device *pdev)
>> struct wm831x *wm831x = wm831x_power->wm831x;
>> int irq, i;
>>
>> + if (wm831x_power->usb_phy) {
>> + usb_unregister_notifier(wm831x_power->usb_phy,
>> + &wm831x_power->usb_notify);
>> + }
>> +
>> for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
>> irq = wm831x_irq(wm831x,
>> platform_get_irq_byname(pdev,
>> --
>> 1.7.9.5
>>
--
Baolin.wang
Best Regards
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