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Date:   Wed, 23 Nov 2022 13:44:36 -0600
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc:     Rob Herring <robh+dt@kernel.org>, Rob Herring <robh@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Cai Huoqing <cai.huoqing@linux.dev>,
        Robin Murphy <robin.murphy@arm.com>,
        Jingoo Han <jingoohan1@gmail.com>,
        Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Frank Li <Frank.Li@nxp.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        caihuoqing <caihuoqing@baidu.com>, Vinod Koul <vkoul@kernel.org>,
        linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 17/20] PCI: dwc: Introduce generic resources getter
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In-Reply-To: <20221113191301.5526-18-Sergey.Semin@baikalelectronics.ru>
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Hi Serge,

On Sun, Nov 13, 2022 at 10:12:58PM +0300, Serge Semin wrote:
> Currently the DW PCIe Root Port and Endpoint CSR spaces are retrieved in
> the separate parts of the DW PCIe core driver. It doesn't really make
> sense since the both controller types have identical set of the core CSR
> regions: DBI, DBI CS2 and iATU/eDMA. Thus we can simplify the DW PCIe Host
> and EP initialization methods by moving the platform-specific registers
> space getting and mapping into a common method. It gets to be even more
> justified seeing the CSRs base address pointers are preserved in the
> common DW PCIe descriptor. Note all the OF-based common DW PCIe settings
> initialization will be moved to the new method too in order to have a
> single function for all the generic platform properties handling in single
> place.
> 
> A nice side-effect of this change is that the pcie-designware-host.c and
> pcie-designware-ep.c drivers are cleaned up from all the direct dw_pcie
> storage modification, which makes the DW PCIe core, Root Port and Endpoint
> modules more coherent.

Thanks for these new generic interfaces in the DWC core!  And thanks
for the changes in this patch to take advantage of them in the
pcie-designware drivers.

Do you plan similar changes to other drivers to take advantage of
these DWC-generic data and interfaces?  If you add generic things to
the DWC core but only take advantage of them in your driver, I don't
think they are really usefully generic.

Bjorn