linux-kernel - Re: [PATCH v3 4/5] PCI: imx6: Convert to agnostic GPIO API

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Message-ID: <20240507082822.GA6659@thinkpad>
Date: Tue, 7 May 2024 13:58:22 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Frank Li <Frank.Li@....com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-amlogic@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, linux-tegra@...r.kernel.org,
	Vignesh Raghavendra <vigneshr@...com>,
	Siddharth Vadapalli <s-vadapalli@...com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Yue Wang <yue.wang@...ogic.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Xiaowei Song <songxiaowei@...ilicon.com>,
	Binghui Wang <wangbinghui@...ilicon.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Pali Rohár <pali@...nel.org>
Subject: Re: [PATCH v3 4/5] PCI: imx6: Convert to agnostic GPIO API

On Tue, May 07, 2024 at 01:44:56PM +0530, Manivannan Sadhasivam wrote:
> On Mon, May 06, 2024 at 02:10:24PM +0200, Linus Walleij wrote:
> > On Mon, Apr 29, 2024 at 12:25 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > 
> > > The of_gpio.h is going to be removed. In preparation of that convert
> > > the driver to the agnostic API.
> > >
> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > Reviewed-by: Frank Li <Frank.Li@....com>
> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > 
> > I think there is a bug here, the code is respecting the OF property
> > "reset-gpio-active-high"
> > but the code in drivers/gpio/gpiolib-of.h actually has a quirk for
> > this so you can just
> > delete all the active high handling and rely on 1 = asserted and 0 =
> > deasserted when
> > using GPIO descriptors.
> > 
> 
> Wow...
> 
> So this bug is present even before this series, right?
> 
> > Just delete this thing:
> > imx6_pcie->gpio_active_high = of_property_read_bool(node,
> >                                            "reset-gpio-active-high");
> 
> But this is just a bandaid IMO. The flag for the PERST# GPIO should be properly
> set in the board dts as per the board design.
> 

Hmm, no. I was confused by the property. But this quirk in gpiolib-of.c is going
to be applied while changing the GPIO state also or just during request time?

- Mani

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