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

From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: Rob Herring <robh@kernel.org>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	linuxarm@huawei.com, mauro.chehab@huawei.com,
	Manivannan Sadhasivam <mani@kernel.org>,
	Binghui Wang <wangbinghui@hisilicon.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Xiaowei Song <songxiaowei@hisilicon.com>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org
Subject: Re: [PATCH v5 4/8] dt-bindings: PCI: kirin: Drop PHY properties
Date: Wed, 14 Jul 2021 13:22:46 +0200	[thread overview]
Message-ID: <20210714132246.0bb44667@coco.lan> (raw)
In-Reply-To: <20210714022849.GA1330659@robh.at.kernel.org>

Em Tue, 13 Jul 2021 20:28:49 -0600
Rob Herring <robh@kernel.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@f3f2000 {
		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