linux-kernel - Re: [PATCH v4 15/23] dt-bindings: PCI: dra7xx: Add dt bindings to enable unaligned access

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Message-ID: <20170320214316.yah5cvfdabiceywf@rob-hp-laptop>
Date:   Mon, 20 Mar 2017 16:43:16 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        hch@...radead.org, nsekhar@...com
Subject: Re: [PATCH v4 15/23] dt-bindings: PCI: dra7xx: Add dt bindings to
 enable unaligned access

On Mon, Mar 13, 2017 at 07:52:51PM +0530, Kishon Vijay Abraham I wrote:
> Update device tree binding documentation of TI's dra7xx PCI
> controller to include property for enabling unaligned mem access.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  Documentation/devicetree/bindings/pci/ti-pci.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
> index 190828a5f32a..b69dd7dbd29e 100644
> --- a/Documentation/devicetree/bindings/pci/ti-pci.txt
> +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
> @@ -39,6 +39,11 @@ DEVICE MODE
>   - interrupts : one interrupt entries must be specified for main interrupt.
>   - num-ib-windows : number of inbound address translation windows
>   - num-ob-windows : number of outbound address translation windows
> + - ti,syscon-unaligned-access: phandle to the syscon dt node. The 1st argument
> +			       should contain the register offset within syscon
> +			       and the 2nd argument should contain the bit field
> +			       for setting the bit to enable unaligned
> +			       access.

This should be setup by the firmware/bootloader or some platform code. 
Why does the PCI host need to configure this?

Rob