[PATCH 3/6] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property

Pali Rohár pali at kernel.org
Tue Feb 22 09:53:28 PST 2022


On Tuesday 22 February 2022 18:24:15 Marek Behún wrote:
> On Tue, 22 Feb 2022 17:31:55 +0100
> Pali Rohár <pali at kernel.org> wrote:
> 
> > This property specifies slot power limit in mW unit. It is a form-factor
> > and board specific value and must be initialized by hardware.
> > 
> > Some PCIe controllers delegate this work to software to allow hardware
> > flexibility and therefore this property basically specifies what should
> > host bridge program into PCIe Slot Capabilities registers.
> > 
> > The property needs to be specified in mW unit instead of the special format
> > defined by Slot Capabilities (which encodes scaling factor or different
> > unit). Host drivers should convert the value from mW to needed format.
> > 
> > Signed-off-by: Pali Rohár <pali at kernel.org>
> > Signed-off-by: Marek Behún <kabel at kernel.org>
> 
> This patch is not needed, the property already is described in
> dtschema.

But dtschema with this property is not included in kernel and this file
is the only in-kernel documentation. So updating it makes sense.



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