Hi Adam Yes, MMC_DDR52 can use pins_100mhz. You can do that, thanks! Best Regards Bough Chen > -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx > [mailto:linux-mmc-owner@xxxxxxxxxxxxxxx] On Behalf Of Adam Ford > Sent: 2018年10月9日 21:38 > To: linux-mmc@xxxxxxxxxxxxxxx; Linux Kernel Mailing List > <linux-kernel@xxxxxxxxxxxxxxx>; A.s. Dong <aisheng.dong@xxxxxxx>; > haibo.chen@xxxxxxxxxxxxx; Fabio Estevam <fabio.estevam@xxxxxxx> > Subject: Pinmuxing and SDHC speeds on sdhci-esdhc-imx > > I have a question regarding the pinstate and the corresponding uhs_signaling. > > The uhs_signaling shows a variety of timing options, > > MMC_TIMING_UHS_SDR12, MMC_TIMING_UHS_SDR25:, > MMC_TIMING_UHS_SDR50, MMC_TIMING_UHS_SDR104, > MMC_TIMING_MMC_HS200, MMC_TIMING_UHS_DDR50, > MMC_TIMING_MMC_DDR52, MMC_TIMING_MMC_HS400, and > MMC_TIMING_LEGACY > > However the esdhc_change_pinstate function only lists > MMC_TIMING_UHS_SDR50, MMC_TIMING_UHS_DDR50, > MMC_TIMING_UHS_SDR104, MMC_TIMING_MMC_HS200, and > MMC_TIMING_MMC_HS40, and a defaut. > > From what I can tell, this means that MMC_TIMING_MMC_DDR52 uses the > default pinmux. I am wondering if it should use pins_100mhz. We have an > eMMC part that we want to operate at this point and it seems like it missing. > If so, I can submit a patch. > > It also seems like that SDR12, SDR25 use the default. I assume this is OK. > > adam
