From: Krzysztof Kozlowski <krzk@kernel.org>
To: Timon Baetz <timon.baetz@protonmail.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Sebastian Reichel <sre@kernel.org>,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH 3/3] power: supply: max8997_charger: Switch to new binding
Date: Mon, 1 Feb 2021 19:03:35 +0100 [thread overview]
Message-ID: <20210201180335.rrsqfvbcmxvx64gf@kozik-lap> (raw)
In-Reply-To: <20210201083128.18499ffd.timon.baetz@protonmail.com>
On Mon, Feb 01, 2021 at 09:26:42AM +0000, Timon Baetz wrote:
> On Sun, 31 Jan 2021 18:28:40 +0100, Krzysztof Kozlowski wrote:
> > On Sat, Jan 30, 2021 at 05:30:14PM +0000, Timon Baetz wrote:
> > > Get regulator from parent device's node and extcon by name.
> > >
> > > Signed-off-by: Timon Baetz <timon.baetz@protonmail.com>
> > > ---
> > > drivers/power/supply/max8997_charger.c | 12 ++++++++----
> > > 1 file changed, 8 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c
> > > index 321bd6b8ee41..625d8cc4312a 100644
> > > --- a/drivers/power/supply/max8997_charger.c
> > > +++ b/drivers/power/supply/max8997_charger.c
> > > @@ -168,6 +168,7 @@ static int max8997_battery_probe(struct platform_device *pdev)
> > > int ret = 0;
> > > struct charger_data *charger;
> > > struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> > > + struct device_node *np = pdev->dev.of_node;
> > > struct i2c_client *i2c = iodev->i2c;
> > > struct max8997_platform_data *pdata = iodev->pdata;
> > > struct power_supply_config psy_cfg = {};
> > > @@ -237,20 +238,23 @@ static int max8997_battery_probe(struct platform_device *pdev)
> > > return PTR_ERR(charger->battery);
> > > }
> > >
> > > + // grab regulator from parent device's node
> > > + pdev->dev.of_node = iodev->dev->of_node;
> > > charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
> > > + pdev->dev.of_node = np;
> >
> > I think the device does not have its own node anymore. Or did I miss
> > something?
>
> The idea is to reset of_node to whatever it was before (NULL) and basically
> leave the device unchanged. Probe might run again because of deferral.
Good point.
>
> > > if (IS_ERR(charger->reg)) {
> > > if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
> > > return -EPROBE_DEFER;
> > > dev_info(&pdev->dev, "couldn't get charger regulator\n");
> > > }
> > > - charger->edev = extcon_get_edev_by_phandle(&pdev->dev, 0);
> > > - if (IS_ERR(charger->edev)) {
> > > - if (PTR_ERR(charger->edev) == -EPROBE_DEFER)
> > > + charger->edev = extcon_get_extcon_dev("max8997-muic");
> > > + if (IS_ERR_OR_NULL(charger->edev)) {
> > > + if (!charger->edev)
> >
> > Isn't NULL returned when there is simply no extcon? It's different than
> > deferred probe. Returning here EPROBE_DEFER might lead to infinite probe
> > tries (on every new device probe) instead of just failing it.
>
> extcon_get_extcon_dev() just loops through all registered extcon devices
> and compared names. It will return NULL when "max8997-muic" isn't
> registered yet. extcon_get_extcon_dev() never returns EPROBE_DEFER so
> checking for NULL seems to be the only way. Other drivers using that
> function also do NULL check and return EPROBE_DEFER.
Indeed, thanks for clarification. Looks good:
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Best regards,
Krzysztof
next prev parent reply other threads:[~2021-02-01 18:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-30 17:28 [PATCH 0/3] charger-supply for max8997_charger Timon Baetz
2021-01-30 17:29 ` [PATCH 1/3] regulator: dt-bindings: Document charger-supply for max8997 Timon Baetz
2021-01-30 17:29 ` [PATCH 2/3] ARM: dts: exynos: Add charger supply for I9100 Timon Baetz
2021-02-11 5:59 ` Timon Baetz
2021-02-11 7:39 ` Krzysztof Kozlowski
2021-03-02 8:52 ` Krzysztof Kozlowski
2021-01-30 17:30 ` [PATCH 3/3] power: supply: max8997_charger: Switch to new binding Timon Baetz
2021-01-31 17:28 ` Krzysztof Kozlowski
2021-02-01 9:26 ` Timon Baetz
2021-02-01 18:03 ` Krzysztof Kozlowski [this message]
2021-03-09 7:47 ` Timon Baetz
2021-03-26 16:20 ` Timon Baetz
2021-02-03 21:07 ` (subset) [PATCH 0/3] charger-supply for max8997_charger Mark Brown
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