netdev - Re: [PATCH] net: micrel : ks8851-ml: add vdd-supply support

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Message-ID: <20140321085158.GB30910@pengutronix.de>
Date:	Fri, 21 Mar 2014 09:51:58 +0100
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Nishanth Menon <nm@...com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
	netdev@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: micrel : ks8851-ml: add vdd-supply support

Hi,

On Fri, Mar 21, 2014 at 01:52:48AM -0500, Nishanth Menon wrote:
> Few platforms use external regulator to keep the ethernet MAC supplied.
> So, request and enable the regulator for driver functionality.
> 
> Fixes: 66fda75f47dc (regulator: core: Replace direct ops->disable usage)
> Reported-by: Russell King <rmk+kernel@....linux.org.uk>
> Suggested-by: Markus Pargmann <mpa@...gutronix.de>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> 
> This fixes a regression in SDP4430 platform as reported by Russel here:
> http://marc.info/?t=139509918200014&r=1&w=2
> 
> Patch is based on [v3.14-rc7] tag, if it is too late to submit, I can repost
> rebased to git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
> 
>  .../devicetree/bindings/net/micrel-ks8851.txt      |    1 +
>  drivers/net/ethernet/micrel/ks8851.c               |   30 +++++++++++++++++++-
>  2 files changed, 30 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/micrel-ks8851.txt b/Documentation/devicetree/bindings/net/micrel-ks8851.txt
> index 11ace3c..4fc3927 100644
> --- a/Documentation/devicetree/bindings/net/micrel-ks8851.txt
> +++ b/Documentation/devicetree/bindings/net/micrel-ks8851.txt
> @@ -7,3 +7,4 @@ Required properties:
>  
>  Optional properties:
>  - local-mac-address : Ethernet mac address to use
> +- vdd-supply:	supply for Ethernet mac
> diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
> index 727b546a..e0c92e0 100644
> --- a/drivers/net/ethernet/micrel/ks8851.c
> +++ b/drivers/net/ethernet/micrel/ks8851.c
> @@ -23,6 +23,7 @@
>  #include <linux/crc32.h>
>  #include <linux/mii.h>
>  #include <linux/eeprom_93cx6.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <linux/spi/spi.h>
>  
> @@ -83,6 +84,7 @@ union ks8851_tx_hdr {
>   * @rc_rxqcr: Cached copy of KS_RXQCR.
>   * @eeprom_size: Companion eeprom size in Bytes, 0 if no eeprom
>   * @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM.
> + * @vdd_reg:	Optional regulator supplying the chip
>   *
>   * The @lock ensures that the chip is protected when certain operations are
>   * in progress. When the read or write packet transfer is in progress, most
> @@ -130,6 +132,7 @@ struct ks8851_net {
>  	struct spi_transfer	spi_xfer2[2];
>  
>  	struct eeprom_93cx6	eeprom;
> +	struct regulator	*vdd_reg;
>  };
>  
>  static int msg_enable;
> @@ -1414,6 +1417,21 @@ static int ks8851_probe(struct spi_device *spi)
>  	ks->spidev = spi;
>  	ks->tx_space = 6144;
>  
> +	ks->vdd_reg = regulator_get_optional(&spi->dev, "vdd");

You could use devm_regulator_get_optional here and remove the
regulator_put.

Regards,

Markus

> +	if (IS_ERR(ks->vdd_reg)) {
> +		ret = PTR_ERR(ks->vdd_reg);
> +		if (ret == -EPROBE_DEFER)
> +			goto err_reg;
> +	} else {
> +		ret = regulator_enable(ks->vdd_reg);
> +		if (ret) {
> +			dev_err(&spi->dev, "regulator enable fail: %d\n",
> +				ret);
> +			goto err_reg_en;
> +		}
> +	}
> +
> +
>  	mutex_init(&ks->lock);
>  	spin_lock_init(&ks->statelock);
>  
> @@ -1508,8 +1526,14 @@ static int ks8851_probe(struct spi_device *spi)
>  err_netdev:
>  	free_irq(ndev->irq, ks);
>  
> -err_id:
>  err_irq:
> +err_id:
> +	if (!IS_ERR(ks->vdd_reg))
> +		regulator_disable(ks->vdd_reg);
> +err_reg_en:
> +	if (!IS_ERR(ks->vdd_reg))
> +		regulator_put(ks->vdd_reg);
> +err_reg:
>  	free_netdev(ndev);
>  	return ret;
>  }
> @@ -1523,6 +1547,10 @@ static int ks8851_remove(struct spi_device *spi)
>  
>  	unregister_netdev(priv->netdev);
>  	free_irq(spi->irq, priv);
> +	if (!IS_ERR(priv->vdd_reg)) {
> +		regulator_disable(priv->vdd_reg);
> +		regulator_put(priv->vdd_reg);
> +	}
>  	free_netdev(priv->netdev);
>  
>  	return 0;
> -- 
> 1.7.9.5
> 
> 

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