[PATCH v4 15/23] dt-bindings: PCI: dra7xx: Add dt bindings to enable unaligned access
Kishon Vijay Abraham I
kishon at ti.com
Wed Mar 22 07:37:18 PDT 2017
Hi Rob,
On Tuesday 21 March 2017 03:13 AM, Rob Herring wrote:
> 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 at ti.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?
That would create a dependency between the bootloader and kernel which is
usually avoided in platforms like dra7xx.
Thanks
Kishon
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