linux-kernel - Re: [PATCH] mmc:host:sdhci-pci: Addition of Arasan PCI controller with integrated phy.

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Message-ID: <CAEJoYxGpG7xDS7z9DVCrm5cc8XWuyWFqUJBZkbFgT8qD3MpOJw@mail.gmail.com>
Date:   Mon, 9 Oct 2017 13:15:17 -0700
From:   Atul Garg <agarg@...san.com>
To:     Nishanth Menon <nm@...com>
Cc:     Shawn Lin <shawn.lin@...k-chips.com>,
        "Kattekola, Ravikumar" <rk@...com>, adrian.hunter@...el.com,
        KISHON VIJAY ABRAHAM <kishon@...com>,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Nori, Sekhar" <nsekhar@...com>
Subject: Re: [PATCH] mmc:host:sdhci-pci: Addition of Arasan PCI controller
 with integrated phy.

On Wed, Sep 27, 2017 at 8:10 PM, Nishanth Menon <nm@...com> wrote:
> On 09/27/2017 02:27 PM, Atul Garg wrote:
>>
>> On Sep 26, 2017 8:55 PM, "Shawn Lin" <shawn.lin@...k-chips.com
>> <mailto:shawn.lin@...k-chips.com>> wrote:
>>     On 2017/9/27 2:59, Atul Garg wrote:
>
>
> [...]
>
>>         ---
>>            drivers/mmc/host/sdhci-pci-core.c | 372
>>         ++++++++++++++++++++++++++++++++++++++
>>
>>
>>     Fundamentally maybe you need a sdhci-pci-arasan.c
>>
>>     And the arasan PHY isn't new here as sdhci-of-arasan already added
>>     arasan PHY support for eMMC 5.1, but just with different register
>>     layout and content. So could you also use generic PHY framework?
>>
>>
>> Thanks. We are doing two things adding support for Arasan PCI SDHC and PHY
>> specific code to it integrated via a window in same PCI address space
>> (extended).
>>
>> If we correctly understand, you are suggesting to take the PHY code out as
>> a PHY driver module similar to phy/rockchip/ and use those functions from
>> phy framework within the sdhci-pci-core?
>
>
> yes, it might allow some reuse possibly as well.
>

Thanks , We looked at some options and spent time in evaluating
instead of phy model ( it probably works when you have SOC arch) we
see sdhci-pci-arasan.c file creation similar to sdhci-pci-o2micro.c is
feasible we have tested the changes and will be releasing next version
of patch. This minimizes the changes in sdhic-pci-core files to
minimal number of lines by just adding the controller support and
keeps the arasan specific code separate.
>
> --
> Regards,
> Nishanth Menon
>
> PS: please switch to plain text.

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