linux-kernel - Re: [PATCHv7] drivers/amba: add reset control to amba bus probe

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Date:   Tue, 3 Sep 2019 17:07:59 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Herring <robh@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Frank Rowand <frowand.list@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCHv7] drivers/amba: add reset control to amba bus probe

On Tue, Sep 3, 2019 at 4:20 PM Dinh Nguyen <dinguyen@...nel.org> wrote:

> The primecell controller on some SoCs, i.e. SoCFPGA, is held in reset by
> default. Until recently, the DMA controller was brought out of reset by the
> bootloader(i.e. U-Boot). But a recent change in U-Boot, the peripherals
> that are not used are held in reset and are left to Linux to bring them
> out of reset.
>
> Add a mechanism for getting the reset property and de-assert the primecell
> module from reset if found. This is a not a hard fail if the reset properti
> is not present in the device tree node, so the driver will continue to
> probe.
>
> Because there are different variants of the controller that may have
> multiple reset signals, the code will find all reset(s) specified and
> de-assert them.
>
> Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Please put this patch into Russell's patch tracker.

Yours,
Linus Walleij