linux-kernel - Re: [PATCH v6 4/4] power: supply: twl4030-charger: add deferred probing for phy and iio

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Date:   Thu, 15 Jun 2017 13:57:57 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        NeilBrown <neil@...wn.name>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Marek Belisko <marek@...delico.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, letux-kernel@...nphoenux.org,
        notasas@...il.com, linux-omap@...r.kernel.org
Subject: Re: [PATCH v6 4/4] power: supply: twl4030-charger: add deferred
 probing for phy and iio

Hi,

On Wed, Jun 14, 2017 at 11:25:56AM +0200, H. Nikolaus Schaller wrote:
> This fixes an issue if both this twl4030_charger driver and
> phy-twl4030-usb are compiled as modules and loaded in random order.
> 
> It has been observed on GTA04 and OpenPandora devices that in worst
> case the boot process hangs and in best case the AC detection fails
> with a warning.
> 
> Therefore we add deferred probing checks for the usb_phy and the
> iio channel for AC detection.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  drivers/power/supply/twl4030_charger.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index 3bebeecb4a1f..6ac8816262bd 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -989,15 +989,21 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  
>  		phynode = of_find_compatible_node(bci->dev->of_node->parent,
>  						  NULL, "ti,twl4030-usb");
> -		if (phynode)
> +		if (phynode) {
>  			bci->transceiver = devm_usb_get_phy_by_node(
>  				bci->dev, phynode, &bci->usb_nb);
> +			if (IS_ERR(bci->transceiver) &&
> +			    PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
> +				return -EPROBE_DEFER;	/* PHY not ready */
> +		}
>  	}

Let's also set to NULL + dev_warn for other errors (like the iio
channel error handling).

>  	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
>  	if (IS_ERR(bci->channel_vac)) {
> -		bci->channel_vac = NULL;
> +		if (PTR_ERR(bci->channel_vac) == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;	/* iio not ready */
>  		dev_warn(&pdev->dev, "could not request vac iio channel");
> +		bci->channel_vac = NULL;
>  	}
>  
>  	bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,

-- Sebastian

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