linux-kernel - Re: [PATCH 30/37] dt-bindings: PCI: dra7xx: Add dt bindings to enable legacy mode

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Date:   Thu, 16 Feb 2017 14:03:57 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Arnd Bergmann <arnd@...db.de>, <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>,
        <linux-samsung-soc@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-arm-kernel@...s.com>,
        <linux-arm-msm@...r.kernel.org>, <nsekhar@...com>
Subject: Re: [PATCH 30/37] dt-bindings: PCI: dra7xx: Add dt bindings to enable
 legacy mode

Hi,

On Thursday 19 January 2017 03:16 AM, Rob Herring wrote:
> On Thu, Jan 12, 2017 at 03:56:19PM +0530, Kishon Vijay Abraham I wrote:
>> Update device tree binding documentation of TI's dra7xx PCI
>> controller to include property for enabling legacy mode.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  Documentation/devicetree/bindings/pci/ti-pci.txt |    4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
>> index 62f5f59..ed85e8e 100644
>> --- a/Documentation/devicetree/bindings/pci/ti-pci.txt
>> +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
>> @@ -39,6 +39,10 @@ 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
>> + - syscon-legacy-mode: 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
>> +		       legacy mode
> 
> What's legacy mode?

It's the name of the bit-field defined in TRM used to add workaround for errata
id i870 (See [PATCH 29/37] PCI: dwc: dra7xx: Workaround for errata id i870 of
this series). I'm not sure what it does internally.

Thanks
Kishon