[v3, 0/7] Add SD UHS-I and eMMC HS200 support for eSDHC

[Y.B. Lu]

Hi all,

Any comments? Thanks.


Best regards,
Yangbo Lu

> -----Original Message-----
> From: Yangbo Lu [mailto:yangbo.lu at nxp.com]
> Sent: Monday, March 27, 2017 3:50 PM
> To: linux-mmc at vger.kernel.org; devicetree at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; ulf.hansson at linaro.org; Adrian Hunter; Rob
> Herring; Mark Rutland; Catalin Marinas; Will Deacon
> Cc: Xiaobo Xie; Y.B. Lu
> Subject: [v3, 0/7] Add SD UHS-I and eMMC HS200 support for eSDHC
> 
> It's complicated to support SD UHS-I and eMMC HS200 for eSDHC because
> there're many differences between eSDHC and SD/eMMC spec. Several
> differences as below must be considered:
> 1. Peripheral clock must be used instead of platform clock.
>     - eSDHC could select peripheral clock or platform clock as its clock
>       source. According to RM, UHS-I/HS200 must use peripheral clock
> since
>       it supports higher frequency than platform clock.
>     - Patch 1 and patch 6 is to support this.
> 2. Signal voltage switching requires a control circuit out of eSDHC.
>     - eSDHC supports signal voltage switch from 3.3v to 1.8v by
>       eSDHC_PROCTL[VOLT_SEL] bit. This bit changes the value of output
>       signal SDHC_VS, and there must be a control circuit out of eSDHC
>       to change the signal voltage according to SDHC_VS output signal.
>     - Patch 2 is to support this.
> 3. eSDHC uses tuning block for tuning procedure.
>     - Tuning clock control register must be configured before tuning.
>     - Patch 3 is to support this.
> 4. Delay is needed between tuning cycles for HS200 tuning.
>     - Once a patch removed mdelay between tuning cycles.
>       But eSDHC needs it.
>     - Patch 4 and patch 5 is to support this.
> 5. UHS-I/HS200 modes could be enabled in dts node.
>     - Patch 7 is to support this.
> 
> Please review and merge these patches on mmc git tree if no changes are
> required.
> 
> Adrian Hunter (1):
>   mmc: sdhci: Control the delay between tuning commands
> 
> Yangbo Lu (6):
>   mmc: sdhci-of-esdhc: add peripheral clock support
>   mmc: sdhci-of-esdhc: add support for signal voltage switch
>   mmc: sdhci-of-esdhc: add tuning support
>   mmc: sdhci-of-esdhc: add delay between tuning cycles
>   arm64: dts: ls1046a: add clocks property and compatible for eSDHC node
>   arm64: dts: ls1046ardb: add MMC HS200/UHS-1 modes support
> 
>  arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts |   8 ++
>  arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi    |   3 +-
>  drivers/mmc/host/sdhci-esdhc.h                    |   7 +
>  drivers/mmc/host/sdhci-of-esdhc.c                 | 165
> +++++++++++++++++++++-
>  drivers/mmc/host/sdhci.c                          |  11 +-
>  drivers/mmc/host/sdhci.h                          |   2 +
>  6 files changed, 190 insertions(+), 6 deletions(-)
> 
> --
> 2.1.0.27.g96db324