linux-kernel - Re: [PATCH 08/16] PCI: dwc: Drop inbound iATU types enumeration

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Date:   Tue, 29 Mar 2022 10:16:15 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/16] PCI: dwc: Drop inbound iATU types enumeration -
 dw_pcie_as_type

On Thu, Mar 24, 2022 at 04:37:26AM +0300, Serge Semin wrote:
> There is no point in having an enumeration declared in the driver for the
> PCIe end-point. First of all it's redundant since the driver already has a
> set of macro declared which describe the available in/out iATU types, thus
> having an addition abstraction just needlessly complicates the code.
> Secondly checking the passed iATU type for validity within a single driver
> is pointless since the driver is supposed to be consistent by its nature.
> Finally the outbound iATU type isn't encoded by the denoted enumeration,
> thus giving a false impression that the in and out iATU types are
> unrelated while they are the same. So to speak let's drop the redundant
> dw_pcie_as_type enumeration replacing it with the direct iATU type usage.
> 
> While at it, since we are touching the iATU inbound regions config methods
> anyway, let's fix the arguments order so the type would be followed by the
> address-related parameters. Thus the inbound and outbound iATU setup
> methods will look alike. That shall improve the code readability a bit.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  .../pci/controller/dwc/pcie-designware-ep.c   | 21 +++++------
>  drivers/pci/controller/dwc/pcie-designware.c  | 35 +++----------------
>  drivers/pci/controller/dwc/pcie-designware.h  |  9 +----
>  3 files changed, 15 insertions(+), 50 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>