linux-kernel - Re: [RFC PATCH] gpio: Add a defer reset object to send board specific reset

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Message-ID: <CAL8JtxB3DoWRwox4zn5mkP6UjejPWUYxzmuxZMLPxyMmPW8MNg@mail.gmail.com>
Date:	Wed, 18 Jun 2014 00:01:08 +0800
From:	Houcheng Lin <houcheng@...il.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH] gpio: Add a defer reset object to send board specific reset

Hi,

2014-06-16 21:18 GMT+08:00 Ulf Hansson <ulf.hansson@...aro.org>:
>
> If I understand correct, you need a per device reset functionality?
> And obviously the reset implementation is board/SoC specific.
>
> We have the "Reset Controller framework", drivers/reset. Could this help you?
>
> Kind regards
> Ulf Hansson
>

Thanks for your information. The defer reset object is to send
board specific reset signal and this signal has to be sent after
some device is intialized. For example, a USB device may need extra
reset signal after root hub is initialized.

As machine init code is run before driver init-call, can not add reset
sending here if it depends on a specific device's initialization.

Also it provides a DT node that helps both HW/SW developer to use this
feature.

Best regards,
Houcheng Lin
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