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

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Message-ID: <20220222175328.cwrls2sziscguixe@pali>
Date:   Tue, 22 Feb 2022 18:53:28 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Marek Behún <kabel@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe
 port property

On Tuesday 22 February 2022 18:24:15 Marek Behún wrote:
> On Tue, 22 Feb 2022 17:31:55 +0100
> Pali Rohár <pali@...nel.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@...nel.org>
> > Signed-off-by: Marek Behún <kabel@...nel.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.