netdev - Re: [PATCH 3/3] net: fec: add phy-reset-interval for device tree probe

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Message-ID: <2921547.BkALd1Y1Bk@flexo>
Date:	Tue, 26 Jun 2012 13:55:05 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] net: fec: add phy-reset-interval for device tree probe

Hi,

On Tuesday 26 June 2012 16:45:08 Shawn Guo wrote:
> Different boards may require different phy reset interval time.  Add
> property phy-reset-interval for device tree probe, so that the boards
> that need a longer interval time can specify it in their device tree.
> 
> Along with the update to phy related stuff, it also makes a minor fix
> on phy-reset-gpios in binding document to have it be optional to match
> the driver code.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---
>  Documentation/devicetree/bindings/net/fsl-fec.txt |    5 ++++-
>  drivers/net/ethernet/freescale/fec.c              |    4 +++-
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt 
b/Documentation/devicetree/bindings/net/fsl-fec.txt
> index 7ab9e1a..74a4ce7 100644
> --- a/Documentation/devicetree/bindings/net/fsl-fec.txt
> +++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
> @@ -7,10 +7,13 @@ Required properties:
>  - phy-mode : String, operation mode of the PHY interface.
>    Supported values are: "mii", "gmii", "sgmii", "tbi", "rmii",
>    "rgmii", "rgmii-id", "rgmii-rxid", "rgmii-txid", "rtbi", "smii".
> -- phy-reset-gpios : Should specify the gpio for phy reset
>  
>  Optional properties:
>  - local-mac-address : 6 bytes, mac address
> +- phy-reset-gpios : Should specify the gpio for phy reset
> +- phy-reset-interval : Reset interval time in milliseconds.  Should present
> +  only if property "phy-reset-gpios" is available.  When "phy-reset-gpios"
> +  is available, missing the property will have the interval be 1 
millisecond.
>  
>  Example:
>  
> diff --git a/drivers/net/ethernet/freescale/fec.c 
b/drivers/net/ethernet/freescale/fec.c
> index 4dce9e3..86ecaae 100644
> --- a/drivers/net/ethernet/freescale/fec.c
> +++ b/drivers/net/ethernet/freescale/fec.c
> @@ -1507,18 +1507,20 @@ static int __devinit fec_get_phy_mode_dt(struct 
platform_device *pdev)
>  static void __devinit fec_reset_phy(struct platform_device *pdev)
>  {
>  	int err, phy_reset;
> +	int msec = 1;
>  	struct device_node *np = pdev->dev.of_node;
>  
>  	if (!np)
>  		return;
>  
> +	of_property_read_u32(np, "phy-reset-interval", &msec);
>  	phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
>  	err = gpio_request_one(phy_reset, GPIOF_OUT_INIT_LOW, "phy-reset");
>  	if (err) {
>  		pr_debug("FEC: failed to get gpio phy-reset: %d\n", err);
>  		return;
>  	}
> -	msleep(1);
> +	msleep(msec);

You might want to check the value of the property here to make sure it is in 
the msleep() acceptable range.

>  	gpio_set_value(phy_reset, 1);
>  }
>  #else /* CONFIG_OF */
> -- 
> 1.7.5.4
> 
> 
> --
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