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SubjectRe: [PATCH v4 3/3] power: wm831x_power: Support USB charger current limit management
On 4 August 2017 at 03:16, Rob Herring <robh@kernel.org> wrote:
> On Thu, Jul 27, 2017 at 01:14:38PM +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@kernel.org>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>> Acked-by: Lee Jones <lee.jones@linaro.org>
>> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
>> ---
>> Documentation/devicetree/bindings/mfd/wm831x.txt | 1 +
>> drivers/power/supply/wm831x_power.c | 72 ++++++++++++++++++++++
>> 2 files changed, 73 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/wm831x.txt b/Documentation/devicetree/bindings/mfd/wm831x.txt
>> index 9f8b743..4e3bc07 100644
>> --- a/Documentation/devicetree/bindings/mfd/wm831x.txt
>> +++ b/Documentation/devicetree/bindings/mfd/wm831x.txt
>> @@ -31,6 +31,7 @@ Required properties:
>> ../interrupt-controller/interrupts.txt
>>
>> Optional sub-nodes:
>> + - usb-phy : Contains a phandle to the USB PHY.
>
> Use the phy binding ("phys") instead.

OK. Will fix in next version. Thanks.

>
>> - regulators : Contains sub-nodes for each of the regulators supplied by
>> the device. The regulators are bound using their names listed below:
>>
>> diff --git a/drivers/power/supply/wm831x_power.c b/drivers/power/supply/wm831x_power.c
>> index 7082301..dff6473 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 +647,33 @@ static int wm831x_power_probe(struct platform_device *pdev)
>> }
>> }
>>
>> + power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
>> + ret = PTR_ERR_OR_ZERO(power->usb_phy);
>> +
>> + switch (ret) {
>> + case 0:
>> + 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;
>> + }
>> + break;
>> + case -EINVAL:
>> + case -ENODEV:
>> + /* ignore missing usb-phy, it's optional */
>> + power->usb_phy = NULL;
>> + ret = 0;
>> + break;
>> + default:
>> + dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret);
>> + /* fall-through */
>> + case -EPROBE_DEFER:
>> + goto err_bat_irq;
>> + break;
>> + }
>> +
>> return ret;
>>
>> err_bat_irq:
>> @@ -637,6 +704,11 @@ 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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