linux-kernel - Re: [PATCH v3 0/3] mmc: Add OMAP SDHCI driver

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Date:   Fri, 22 Sep 2017 11:45:11 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Mark Brown <broonie@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tony Lindgren <tony@...mide.com>,
        Liam Girdwood <lgirdwood@...il.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 0/3] mmc: Add OMAP SDHCI driver

On 6 September 2017 at 13:45, Kishon Vijay Abraham I <kishon@...com> wrote:
> This is the first step in deprecating omap_hsmmc driver completely
> and moving to sdhci-omap driver which uses the sdhci library.
>
> This patch that adds a new SDHCI quirk "MMC_RSP_136" has already been
> merged and hence removed it in this revision.
>
> Apart from the quirk, sdhci-omap has it's own callbacks
> to set_clock (clock divider programming is different from generic sdhci)
> , set_power, set_bus_width, set_bus_mode and platform_send_init_74_clocks.
> These callback functions are implemented based on omap_hsmmc driver.
> Since sdhci-omap driver requires pbias regulator fixes to be present, I've
> sent them as part of this series.
>
> The sdhci-omap driver supports only the high speed mode and UHS/HS200
> mode will be added in a later series.
>
> It has been tested only in boards having DRA7 SoCs like dra7-evm, dra72-evm,
> am571x-idk, am572x-idk, am57xx-evm. (Tested only eMMC and SD.
> SDIO support will be added later). The plan is to fully convert DRA7
> SoC to use SDHCI driver and then convert other legacy platforms to use
> SDHCI.
>
> For sdhci-omap to be functional, the following tag should be merged (There
> are no compilation dependencies).
> git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
> tags/regulator-pbias-variants

Tag pulled.

>
> However the above regulator tag will impact omap_hsmmc driver. so [1]
> should be merged before everything else is merged.
>
> [1] -> https://lkml.org/lkml/2017/8/31/300

Applied.

>
> The patch to add config and dts changes to use sdhci-omap will be sent
> separately.
>
> Next Steps:
> *) Add UHS support to sdhci-omap
> *) Add SDIO support
> *) Add support for older TI platforms
>
> Changes from v3:
> *) removed omap_hsmmc and pbias-regulator patches from the series
> *) Fixed dt-binding documentation (remove '0x' in node name)
> *) stop clock if MMC core sends '0' in frequency
>
> Changes from v2:
> *) Rebased on git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next
> *) Included a couple of patches from Ravikumar to fix pbias-regulator driver
>    to support max-voltage of 3.3V. This is required for sdhci-omap driver.
> *) Create sdhci-omap as a new driver with MMC generic bindings and hence doesn't
>    have bindings like ti,dual-volt added for omap-hsmmc. (Instead of
>    ti,dual-volt, sdhci-omap driver uses the supported regulator voltage to
>    set controller IO voltage capabilities).
>    When omap-hsmmc driver is deprecated, support for these properties will
>    be added to sdhci-omap.
> *) Fixed minor comments from Adrian).
>
> Changes from v1:
> *) Remove the quirks and instead use sdhci_omap specific callbacks for
>    set_power, set_busmode etc.
> *) Add a patch from Adrian to tidy reading 136-bit responses
>
> I've also pushed the entire series along with dependent dt patches @
> https://github.com/kishon/linux-wip.git sdhci_v3 (in case someone
> wants to test)
>
> Kishon Vijay Abraham I (3):
>   dt-bindings: sdhci-omap: Add bindings for the sdhci-omap controller
>   mmc: sdhci-omap: Add OMAP SDHCI driver
>   MAINTAINERS: Add TI OMAP SDHCI Maintainer
>
>  .../devicetree/bindings/mmc/sdhci-omap.txt         |  16 +
>  MAINTAINERS                                        |   6 +
>  drivers/mmc/host/Kconfig                           |  12 +
>  drivers/mmc/host/Makefile                          |   1 +
>  drivers/mmc/host/sdhci-omap.c                      | 607 +++++++++++++++++++++
>  5 files changed, 642 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-omap.txt
>  create mode 100644 drivers/mmc/host/sdhci-omap.c
>
> --
> 2.11.0
>

Thanks, everything applied/pulled for next! Great work!

Kind regards
Uffe