linux-kernel - Re: [PATCH v3 net-next] mdio_bus: Issue GPIO RESET to PHYs.

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Message-ID: <20170421013858.GB705@lunn.ch>
Date:   Fri, 21 Apr 2017 03:38:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Roger Quadros <rogerq@...com>, davem@...emloft.net,
        tony@...mide.com, nsekhar@...com, jsarha@...com,
        netdev@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 net-next] mdio_bus: Issue GPIO RESET to PHYs.

> > +			gpiod_set_value_cansleep(gpiod, 1);
> > +			udelay(bus->reset_delay_us);
> > +			gpiod_set_value_cansleep(gpiod, 0);
> 
> Does that work even if the polarity of the reset line is active low?

Hi Florian

Yes, it does. The gpiod_ API takes care of that, if you set the flag
GPIO_ACTIVE_LOW in the device tree blob. This is one of the
improvements over the gpio_ API.

		Andrew