linux-kernel - Re: [PATCH v7 2/2] power: supply: twl4030-charger: add deferred probing for phy and iio

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Message-ID: <20170703125954.csrdoxlr3oda57m4@earth>
Date:   Mon, 3 Jul 2017 14:59:54 +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 v7 2/2] power: supply: twl4030-charger: add deferred
 probing for phy and iio

Hi,

On Mon, Jun 19, 2017 at 10:41:46AM +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>

Looks fine to me.

-- Sebastian

> ---
>  drivers/power/supply/twl4030_charger.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index 9d974f1e3957..0d2125e4f735 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -989,8 +989,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  
>  	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
>  	if (IS_ERR(bci->channel_vac)) {
> +		ret = PTR_ERR(bci->channel_vac);
> +		if (ret == -EPROBE_DEFER)
> +			return ret;	/* iio not ready */
> +		dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
> +			ret);
>  		bci->channel_vac = NULL;
> -		dev_warn(&pdev->dev, "could not request vac iio channel");
>  	}
>  
>  	if (bci->dev->of_node) {
> @@ -1002,6 +1006,14 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  			bci->transceiver = devm_usb_get_phy_by_node(
>  				bci->dev, phynode, &bci->usb_nb);
>  			bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
> +			if (IS_ERR(bci->transceiver)) {
> +				ret = PTR_ERR(bci->transceiver);
> +				if (ret == -EPROBE_DEFER)
> +					return ret;	/* phy not ready */
> +				dev_warn(&pdev->dev, "could not request transceiver (%d)",
> +					ret);
> +				bci->transceiver = NULL;
> +			}
>  		}
>  	}
>  
> -- 
> 2.12.2
> 

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