2017-11-02 19:00 GMT+08:00 Ulf Hansson <ulf.hansson@xxxxxxxxxx>: > + Vincent Yang (several emails, don't know which works) > > On 2 November 2017 at 11:49, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: >> On 2 November 2017 at 10:48, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: >>> On 2 November 2017 at 01:12, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: >>>> On 2 November 2017 at 00:08, Rob Herring <robh@xxxxxxxxxx> wrote: >>>>> On Wed, Nov 01, 2017 at 12:21:32AM +0000, Ard Biesheuvel wrote: >>>>>> The Socionext SynQuacer SoC inherits this IP from Fujitsu, but >>>>>> requires the F_SDH30_CMD_DAT_DELAY bit to be set in the >>>>>> F_SDH30_ESD_CONTROL control register. >>>>>> >>>>>> So let's add an optional property to this device's binding, and >>>>>> set the attribute if it is present in the DT node. >>>>>> >>>>>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> >>>>>> --- >>>>>> Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt | 2 ++ >>>>>> drivers/mmc/host/sdhci_f_sdh30.c | 18 +++++++++++++++++- >>>>>> 2 files changed, 19 insertions(+), 1 deletion(-) >>>>>> >>>>>> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt >>>>>> index de2c53cff4f1..9ad02f743ad0 100644 >>>>>> --- a/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt >>>>>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt >>>>>> @@ -15,6 +15,8 @@ Required properties: >>>>>> Optional properties: >>>>>> - vqmmc-supply: phandle to the regulator device tree node, mentioned >>>>>> as the VCCQ/VDD_IO supply in the eMMC/SD specs. >>>>>> +- cmd-dat-delay-select: boolean property indicating that this host requires >>>>>> + the CMD_DAT_DELAY control to be enabled. >>>>> >>>>> Needs a vendor prefix unless this is a standard SDHCI bit (in which >>>>> case it should be documented in a common spot). >>>>> >>>> >>>> I suspect this is a non-standard thing, so I'll add the fujitsu prefix. Ulf? >>> >>> This is specific to the Fujitsu variant. >>> >>> However, what puzzles me is why this bit is needed for the Socionext >>> SynQuacer SoC, but not for other SoCs that uses this IP. That seems >>> weird (probably wrong). >>> >>> Moreover, the F_SDH30_CMD_DAT_DELAY register define is already there, >>> so I would rather suspect that it's something that did got fully >>> implemented. In other words, I don't think you need a new DT binding, >>> but rather try to implement it generically for the sdhci-f_sdh30 >>> driver. Do you think that will work? >>> >> >> Do you mean set it unconditionally? That works for me, but I have no > > Yes. > >> way of testing whether it still works on other SoCs that use this IP. > > Me neither! Hi all, I can not yet get contact with IP owner because it is a holiday in Japan. Around two years ago, F_SDH30_CMD_DAT_DELAY was a new feature of this IP. I will update the latest information as soon as I get it. > > Apparently there are no DTS in the kernel git that uses the > "fujitsu,mb86s70-sdhci-3.0". Around two years ago, sdhci_f_sdh30_driver was a portion for mb86s70 SoC patch series, but finally the patch series did not fully go upstream. Kind regards Vincent > > I looped in Vincent Yang, let's hope he can provide us with some more > information. > > Kind regards > Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
