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

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Message-ID: <20240507081441.GA6025@thinkpad>
Date: Tue, 7 May 2024 13:44:41 +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 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.

- Mani

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