linux-kernel - Re: [PATCH v2 2/3] dt-bindings: PCI: dra7xx: Add properties to enable x2 lane in dra7

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Date:   Fri, 22 Dec 2017 10:24:48 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        nsekhar@...com
Subject: Re: [PATCH v2 2/3] dt-bindings: PCI: dra7xx: Add properties to
 enable x2 lane in dra7

* Kishon Vijay Abraham I <kishon@...com> [171222 06:06]:
> Hi Rob,
> 
> On Thursday 21 December 2017 12:27 AM, Rob Herring wrote:
> > On Tue, Dec 19, 2017 at 02:28:22PM +0530, Kishon Vijay Abraham I wrote:
> >> Add syscon properties required for configuring PCIe in x2 lane mode.
> >>
> >> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> >> Signed-off-by: Sekhar Nori <nsekhar@...com>
> >> ---
> >>  Documentation/devicetree/bindings/pci/ti-pci.txt | 6 ++++++
> >>  1 file changed, 6 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
> >> index 82cb875e4cec..bfbc77ac7355 100644
> >> --- a/Documentation/devicetree/bindings/pci/ti-pci.txt
> >> +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
> >> @@ -13,6 +13,12 @@ PCIe DesignWare Controller
> >>   - ti,hwmods : Name of the hwmod associated to the pcie, "pcie<X>",
> >>  	       where <X> is the instance number of the pcie from the HW spec.
> >>   - num-lanes as specified in ../designware-pcie.txt
> >> + - ti,syscon-lane-conf : phandle/offset pair. Phandle to the system control
> >> +			 module and the register offset to specify 1 lane or
> >> +			 2 lane.
> >> + - ti,syscon-lane-sel : phandle/offset pair. Phandle to the system control
> >> +			module and the register offset to specify lane
> >> +			selection.
> > 
> > Adding a property for every syscon register doesn't really scale and 
> > doesn't work if the register layout changes.
> 
> The register layout doesn't really change between silicon revisions and for new
> SoCs, the phandle and the register offset for that SoC will have to be
> populated again.
> 
> Having said that, I'm not aware of any other alternative here.

Sorry I did not realize this is still open. Sounds like I need to
revert commit 4ece93c020e3 ("ARM: dts: dra7: Add properties to
enable PCIe x2 lane mode"), let me know if that is not the case.

Regards,

Tony