linux-kernel - Re: [PATCH] PCI: dwc: artpec6: Add reset-gpios for PERST# control

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Date:   Mon, 16 Apr 2018 16:35:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jesper Nilsson <jesper.nilsson@...s.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-arm-kernel@...s.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: dwc: artpec6: Add reset-gpios for PERST# control

On Sun, Apr 15, 2018 at 08:56:21PM +0200, Jesper Nilsson wrote:
> Some devices need an optional external gpio for controlling
> the PERST# signal to bring up for example a PCIe switch
> after a soft reset.
> 
> Without this, some boards (the ARTPEC-6 master devboard)
> would not get the PCIe link back after a soft reset.
> 
> Signed-off-by: Jesper Nilsson <jesper.nilsson@...s.com>
> ---
>  .../devicetree/bindings/pci/axis,artpec6-pcie.txt    |  4 ++++
>  drivers/pci/dwc/pcie-artpec6.c                       | 20 +++++++++++++++++++-
>  2 files changed, 23 insertions(+), 1 deletion(-)

Reviewed-by: Rob Herring <robh@...nel.org>