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From: DENG Qingfang <dqfext@gmail.com>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: "Andrew Lunn" <andrew@lunn.ch>,
	"Vivien Didelot" <vivien.didelot@gmail.com>,
	"Florian Fainelli" <f.fainelli@gmail.com>,
	"Vladimir Oltean" <olteanv@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Matthias Brugger" <matthias.bgg@gmail.com>,
	"Sean Wang" <sean.wang@mediatek.com>,
	"Landen Chao" <Landen.Chao@mediatek.com>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	netdev <netdev@vger.kernel.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	"moderated list:ARM/Mediatek SoC support"
	<linux-mediatek@lists.infradead.org>,
	linux-kernel@vger.kernel.org,
	"René van Dorst" <opensource@vdorst.com>,
	"Frank Wunderlich" <frank-w@public-files.de>
Subject: Re: [PATCH net-next 2/2] drivers: net: dsa: mt7530: MT7530 optional GPIO support
Date: Mon, 11 Jan 2021 21:40:00 +0800	[thread overview]
Message-ID: <CALW65jaqciOiRxJxzPiEADgpmKa7-q2QfQnBdaVMcOa5YDHjRA@mail.gmail.com> (raw)
In-Reply-To: <20210111110407.GR1551@shell.armlinux.org.uk>

On Mon, Jan 11, 2021 at 7:04 PM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
>
> FYI, Documentation/driver-api/gpio/consumer.rst says:
>
>   For output GPIOs, the value provided becomes the initial output value.
>   This helps avoid signal glitching during system startup.
>
> Setting the pin to be an output, and then setting its initial value
> does not avoid the glitch. You may wish to investigate whether you
> can set the value before setting the pin as an output to avoid this
> issue.
>

So, setting the Output Enable bit _after_ setting the direction and
initial value should avoid this issue. Right?

  reply	other threads:[~2021-01-11 13:40 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11  5:44 [PATCH net-next 0/2] dsa: add MT7530 GPIO support DENG Qingfang
2021-01-11  5:44 ` [PATCH net-next 1/2] dt-bindings: net: dsa: add MT7530 GPIO controller binding DENG Qingfang
2021-01-14 19:11   ` Rob Herring
2021-01-18 14:43   ` Linus Walleij
2021-01-11  5:44 ` [PATCH net-next 2/2] drivers: net: dsa: mt7530: MT7530 optional GPIO support DENG Qingfang
2021-01-11 11:04   ` Russell King - ARM Linux admin
2021-01-11 13:40     ` DENG Qingfang [this message]
2021-01-11 13:55       ` Russell King - ARM Linux admin
2021-01-18 14:55   ` Linus Walleij
2021-01-19  3:20     ` DENG Qingfang
2021-01-22 10:06       ` Linus Walleij
2021-01-11 13:43 ` [PATCH net-next 0/2] dsa: add MT7530 " Vladimir Oltean
2021-01-14  9:36   ` Bartosz Golaszewski
2021-01-11 15:46 ` Marek Behún
2021-01-12  2:50   ` DENG Qingfang
2021-01-14 17:08     ` Florian Fainelli

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