netdev - Re: [PATCH 2/3] net: fec: convert to using gpiod framework

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Date:	Tue, 1 Dec 2015 11:29:17 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Duan Andy <fugang.duan@...escale.com>
Cc:	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Fabio Estevam <Fabio.Estevam@...escale.com>,
	Greg Ungerer <gerg@...inux.org>,
	Kevin Hao <haokexin@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Philippe Reynes <tremyfr@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"Stefan Agner" <stefan@...er.ch>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	"Uwe Kleine-K?nig" <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 2/3] net: fec: convert to using gpiod framework

Hi,

> From: Lothar Waßmann <LW@...O-electronics.de> Sent: Monday, November 30, 2015 7:33 PM
> > To: Andrew Lunn; David S. Miller; Estevam Fabio-R49496; Greg Ungerer;
> > Kevin Hao; Lothar Waßmann; Lucas Stach; Duan Fugang-B38611; Philippe
> > Reynes; Richard Cochran; Russell King; Sascha Hauer; Stefan Agner; linux-
> > kernel@...r.kernel.org; netdev@...r.kernel.org; Jeff Kirsher; Uwe Kleine-
> > König
> > Subject: [PATCH 2/3] net: fec: convert to using gpiod framework
> > 
> > Use gpiod_get_optional() instead of checking for a valid GPIO number and
> > calling devm_gpio_request_one() conditionally.
> > 
> > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
> > ---
> >  drivers/net/ethernet/freescale/fec_main.c | 17 +++++++----------
> >  1 file changed, 7 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/freescale/fec_main.c
> > b/drivers/net/ethernet/freescale/fec_main.c
> > index e17d74f..1a983fc 100644
> > --- a/drivers/net/ethernet/freescale/fec_main.c
> > +++ b/drivers/net/ethernet/freescale/fec_main.c
> > @@ -3233,7 +3233,7 @@ static int fec_enet_init(struct net_device *ndev)
> > #ifdef CONFIG_OF  static void fec_reset_phy(struct platform_device *pdev)
> > {
> > -	int err, phy_reset;
> > +	struct gpio_desc *phy_reset;
> >  	int msec = 1;
> >  	struct device_node *np = pdev->dev.of_node;
> > 
> > @@ -3245,18 +3245,15 @@ static void fec_reset_phy(struct platform_device
> > *pdev)
> >  	if (msec > 1000)
> >  		msec = 1;
> > 
> > -	phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
> > -	if (!gpio_is_valid(phy_reset))
> > -		return;
> > -
> > -	err = devm_gpio_request_one(&pdev->dev, phy_reset,
> > -				    GPIOF_OUT_INIT_LOW, "phy-reset");
> > -	if (err) {
> > -		dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n",
> > err);
> > +	phy_reset = devm_gpiod_get_optional(&pdev->dev, "phy-reset",
> > +					    GPIOD_OUT_LOW);
> > +	if (IS_ERR(phy_reset)) {
> > +		dev_err(&pdev->dev, "failed to get phy-reset-gpios: %ld\n",
> > +			PTR_ERR(phy_reset));
> >  		return;
> >  	}
> >  	msleep(msec);
> > -	gpio_set_value_cansleep(phy_reset, 1);
> > +	gpiod_set_value_cansleep(phy_reset, 1);
> 
> This API will judge the GPIO active polarity, there many imx boards in dts files don't care the polarity.
> So pls drop the patch.
> 
> Or use gpiod_set_raw_value_cansleep() instead of gpiod_set_value_cansleep().
> 
I could prepare a patch that temporarily uses the raw functions and add
a comment to convert these to the proper functions once all DTB files
have been corrected and some time has passed to account for boards using
old dtbs with newer kernels.

I could also send a patch to convert all in-tree dts files to use
GPIO_ACTIVE_LOW if that is desired.


Lothar Waßmann
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