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Date: Wed, 16 Dec 2020 03:03:55 +0100 From: Andrew Lunn <andrew@...n.ch> To: Serge Semin <Sergey.Semin@...kalelectronics.ru> Cc: Alexandre Torgue <alexandre.torgue@...com>, netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, linux-kernel@...r.kernel.org, Serge Semin <fancer.lancer@...il.com>, Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>, Jose Abreu <joabreu@...opsys.com>, Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Jakub Kicinski <kuba@...nel.org>, Giuseppe Cavallaro <peppe.cavallaro@...com>, Vyacheslav Mitrofanov <Vyacheslav.Mitrofanov@...kalelectronics.ru>, "David S. Miller" <davem@...emloft.net>, linux-arm-kernel@...ts.infradead.org Subject: Re: [RFC] net: stmmac: Problem with adding the native GPIOs support > > From what you are saying, it sounds like from software you cannot > > independently control the GPIO controller reset? > > No. The hardware implements the default MAC reset behavior. So the > GPIO controller gets reset synchronously with the MAC reset and that > can't be changed. Is there pinmux support for these pins? Can you disconnect them from the MAC? Often pins can be connected to different internal IP blocks. Maybe you can flip the pin mux, perform the MAC reset, and then put the pinmux back to connect the pins to the MAC IP again? Andrew
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