From: Vladimir Oltean <olteanv@gmail.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Daniel Golle <daniel@makrotopia.org>,
Frank Wunderlich <frankwu@gmx.de>, Andrew Lunn <andrew@lunn.ch>,
Chen Minqiang <ptpt52@gmail.com>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
"Chester A. Unal" <chester.a.unal@arinc9.com>,
DENG Qingfang <dqfext@gmail.com>,
Sean Wang <sean.wang@mediatek.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, netdev@vger.kernel.org
Subject: Re: [PATCH v3 2/2] net: dsa: mt7530: Use GPIO polarity to generate correct reset sequence
Date: Thu, 4 Dec 2025 19:11:59 +0200 [thread overview]
Message-ID: <20251204171159.yy3nkvzttxecmhfo@skbuf> (raw)
In-Reply-To: <66d080f1-e989-451f-9d5e-34460e5eb1b0@kernel.org>
On Thu, Dec 04, 2025 at 05:48:07PM +0100, Krzysztof Kozlowski wrote:
> Both are the same - inverter or NOT gate, same stuff. It is just
> connecting wire to pull up, not actual component on the board (although
> one could make and buy such component as well...). We never describe
> these inverters in the DTS, these are just too trivial circuits, thus
> the final GPIO_ACTIVE_XXX should already include whatever is on the wire
> between SoC and device.
Please read what Andrew said:
https://lore.kernel.org/netdev/3fbc4e67-b931-421c-9d83-2214aaa2f6ed@lunn.ch/
Assuming there is not a NOT gate placed between the GPIO and the reset
pin, because the board designer decided to do that for some reason?
~~~~~~~~~~~~~~
You two are *not* talking about the same thing. I dismissed the
probability of there being a NOT gate in the form of a discrete chip on
the PCB, *exactly because* you can most likely invert the signal in the
GPIO pin itself.
next prev parent reply other threads:[~2025-12-04 17:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-29 23:46 [PATCH v3 1/2] ARM64: dts: mediatek: fix MT7531 reset GPIO polarity on multiple boards Chen Minqiang
2025-11-29 23:46 ` [PATCH v3 2/2] net: dsa: mt7530: Use GPIO polarity to generate correct reset sequence Chen Minqiang
2025-11-30 1:11 ` Andrew Lunn
2025-11-30 8:07 ` Vladimir Oltean
2025-11-30 20:17 ` Andrew Lunn
2025-12-01 7:48 ` Krzysztof Kozlowski
2025-12-02 11:52 ` Frank Wunderlich
2025-12-02 12:20 ` Daniel Golle
2025-12-04 13:16 ` Vladimir Oltean
2025-12-04 13:50 ` Daniel Golle
2025-12-04 15:45 ` Vladimir Oltean
2025-12-04 14:49 ` Krzysztof Kozlowski
2025-12-04 16:02 ` Vladimir Oltean
2025-12-04 16:48 ` Krzysztof Kozlowski
2025-12-04 17:11 ` Vladimir Oltean [this message]
2025-12-04 17:23 ` Krzysztof Kozlowski
2025-12-04 17:32 ` Krzysztof Kozlowski
2025-12-04 20:47 ` Russell King (Oracle)
2025-12-04 17:45 ` Russell King (Oracle)
2025-12-04 18:21 ` Vladimir Oltean
2025-12-04 15:22 ` Andrew Lunn
2025-12-04 15:37 ` Vladimir Oltean
2025-12-04 15:50 ` Andrew Lunn
2025-12-04 15:52 ` Krzysztof Kozlowski
2025-12-04 16:33 ` Vladimir Oltean
2025-11-30 8:22 ` Vladimir Oltean
2025-12-01 7:50 ` Krzysztof Kozlowski
2025-11-30 1:00 ` [PATCH v3 1/2] ARM64: dts: mediatek: fix MT7531 reset GPIO polarity on multiple boards Andrew Lunn
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