linux-kernel - Re: [PATCH v5 4/8] dt-bindings: PCI: kirin: Drop PHY properties

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Date:   Wed, 14 Jul 2021 13:22:46 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linuxarm@...wei.com,
        mauro.chehab@...wei.com, Manivannan Sadhasivam <mani@...nel.org>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v5 4/8] dt-bindings: PCI: kirin: Drop PHY properties

Em Tue, 13 Jul 2021 20:28:49 -0600
Rob Herring <robh@...nel.org> escreveu:

> On Tue, Jul 13, 2021 at 08:28:37AM +0200, Mauro Carvalho Chehab wrote:
> > There are several properties there that belong to the PHY
> > interface. Drop them, as a new binding file will describe
> > the PHY properties for Kirin 960.  
> 
> Folks are okay with an incompatible change on hikey960?

I hope so ;-)

I mean, it should be easy to add a backward-compatible code that
would make the PHY driver to use the pci-bus old schema if there's
no PHY entry at DT.

However, this is not enough, as the PHY driver won't be loaded/probed
without at least this at hi3660.dtsi:

	pcie_phy: pcie-phy@...2000 {
		compatible = "hisilicon,hi960-pcie-phy";
	};


So, some (probably ugly) hack would be needed at pcie-kirin, in order
to make it to manually load and probe the PHY driver, if it
founds (for instance) "phy" reg-name as a pcie-kirin property.

Thanks,
Mauro