linux-kernel - Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core

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Message-ID: <CAOMZO5DK-K19bHhEpyGoVak5Y7bT-xzA9GjtBSiO6Z+yfeEdgw@mail.gmail.com>
Date:	Wed, 30 Mar 2016 09:45:21 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Petr Štetiar <ynezz@...e.cz>
Cc:	Krzysztof Hałasa <khalasa@...p.pl>,
	Marcel Ziswiler <marcel.ziswiler@...adex.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Stefan Agner <stefan@...er.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity

On Wed, Mar 30, 2016 at 9:06 AM, Petr Štetiar <ynezz@...e.cz> wrote:

> I'm really puzzled by this :-) With your patch applied I get following on
> Toradex Apalis modules:
>
>  DTS:         reset-gpio = <&gpio1 28 GPIO_ACTIVE_LOW>;
>  dmesg:       imx6q-pcie 1ffc000.pcie: phy link never came up
>  gpio:        gpio-28  (                    |reset               ) out hi
>  pin voltage: 0V
>
>  DTS:         reset-gpio = <&gpio1 28 GPIO_ACTIVE_HIGH>;
>  dmesg:       ath9k 0000:01:00.0: enabling device (0140 -> 0142)
>  gpio:        gpio-28  (                    |reset               ) out lo
>  pin voltage: 3V3
>
> So Toradex Apalis is actually active-high? Thanks.

Yes, exactly. That's why you need to introduce a new property to
handle the active-high case, so that old dtb's are not broken.