linux-kernel - Re: [PATCH v3 3/5] dt-bindings: sdhci-omap: Add bindings for the sdhci-omap controller

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Message-ID: <c9342689-f09e-44af-0975-d43ef122a477@ti.com>
Date:   Wed, 23 Aug 2017 19:26:35 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
        Russell King <linux@...linux.org.uk>,
        Ravikumar Kattekola <rk@...com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 3/5] dt-bindings: sdhci-omap: Add bindings for the
 sdhci-omap controller

Hi Uffe,

On Wednesday 23 August 2017 06:37 PM, Ulf Hansson wrote:
> On 23 August 2017 at 07:42, Kishon Vijay Abraham I <kishon@...com> wrote:
>> Add binding for the TI's sdhci-omap controller. This now includes only
>> a subset of properties documented in ti-omap-hsmmc.txt but will eventually
>> include all the properties.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>> Changes from v2:
>> *) Fixed example to use the updated compatible
>>
>> Changes from v1:
>> *) Create a new sdhci-omap.txt document for TI's sdhci-omap controller instead
>>    of using the ti-omap-hsmmc.txt as suggested by Tony
>>  .../devicetree/bindings/mmc/sdhci-omap.txt         | 22 ++++++++++++++++++++++
>>  1 file changed, 22 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-omap.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-omap.txt b/Documentation/devicetree/bindings/mmc/sdhci-omap.txt
>> new file mode 100644
>> index 000000000000..139695ad2d58
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-omap.txt
>> @@ -0,0 +1,22 @@
>> +* TI OMAP SDHCI Controller
>> +
>> +Refer to mmc.txt for standard MMC bindings.
>> +
>> +Required properties:
>> +- compatible: Should be "ti,dra7-sdhci" for DRA7 and DRA72 controllers
>> +- ti,hwmods: Must be "mmc<n>", <n> is controller instance starting 1
>> +
>> +Optional properties:
>> +- ti,dual-volt: boolean, supports dual voltage cards
>> +- ti,non-removable: non-removable slot (like eMMC)
>> +
>> +Example:
>> +       mmc1: mmc@...809c000 {
>> +               compatible = "ti,dra7-sdhci";
>> +               reg = <0x4809c000 0x400>;
>> +               ti,hwmods = "mmc1";
>> +               ti,dual-volt;
>> +               bus-width = <4>;
>> +               vmmc-supply = <&vmmc>; /* phandle to regulator node */
>> +               ti,non-removable;
>> +       };
>> --
>> 2.11.0
>>
> 
> I am wondering a bit on the long term plan here.
> 
> Ideally at some point in future, we would like to remove the old
> omap_hsmmc driver, but from compatible string point of view, that
> means we first needs to deprecate the old ones for a while. Right?

right but sdhci-omap is still lacking features that was present in omap_hsmmc
like context save/restore, SDIO support etc. I think we should deprecate
omap_hsmmc compatible once we add all the features in sdhci-omap?
> 
> That said, what is then the reason to why we should bring over the
> existing omap_hsmmc bindings to the sdhci-omap bindings?

This is mainly for old dt compatibility. Even after removing the omap_hsmmc
driver, users should still be able to use newer kernel with their existing dtbs.

Thanks
Kishon