linux-kernel - Re: [PATCH 3/3] power: supply: max8997

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Message-ID: <20210131172840.fxaadhhsafa4aeex@kozik-lap>
Date:   Sun, 31 Jan 2021 18:28:40 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Timon Baetz <timon.baetz@...tonmail.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 3/3] power: supply: max8997_charger: Switch to new binding

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@...tonmail.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?

>  	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.

Best regards,
Krzysztof


>  			return -EPROBE_DEFER;
>  		dev_info(charger->dev, "couldn't get extcon device\n");
>  	}
>  
> -	if (!IS_ERR(charger->reg) && !IS_ERR(charger->edev)) {
> +	if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
>  		INIT_WORK(&charger->extcon_work, max8997_battery_extcon_evt_worker);
>  		ret = devm_add_action(&pdev->dev, max8997_battery_extcon_evt_stop_work, charger);
>  		if (ret) {
> -- 
> 2.25.1
> 
>