On 6 May 2015 at 15:49, Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> wrote: > On Wed, 2015-05-06 at 10:44 +0200, Ulf Hansson wrote: >> On 6 May 2015 at 03:38, Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> wrote: >> > On Tue, 2015-05-05 at 10:47 +0200, Ulf Hansson wrote: >> >> On 5 May 2015 at 10:35, Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote: >> >> > On 05/05/15 10:56, Ulf Hansson wrote: >> >> >> On 30 April 2015 at 14:32, Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> wrote: >> >> >>> Implement voltage switch, supporting modes up to SDR-50. >> >> >>> >> >> >>> Based on work by Shinobu Uehara, Rob Taylor, William Towle and Ian Molton. >> >> >>> >> >> >>> This uses two voltage regulators, one external and one on the pfc. >> >> >> >> >> >> Why two? If there is a parent child relation ship, that should be >> >> >> handled through the regulator tree, right!? Please elaborate. >> >> > >> >> > The card main power is separate from the IO line voltages. >> >> > >> >> > To get to the high-speed, card power is left at 3.3V and the IO >> >> > voltage is changed to 1.8V. >> >> > >> >> > In the systems we have the power gate is separate from the controls >> >> > for the IO but not integrated into the MMC controller itself. >> > >> > In this case, there are *three* regulators: >> > >> > 1. External regulator for card power (VDD pin): "vmmc" >> > 2. External regulator for pull-up voltage for the data pins: "vqmmc" >> >> Is this really a regulator and not just about changing a pinctrl setting? > > Looking at the Lager board, the pull-up voltage appears to be controlled > by the external PMIC (DA9063), which is signalled using GPIOs (I don't > know why, when it's also connected to I2C). Okay, thus we should have a regulator for it. > >> The reason why I wonder, is because there are several other mmc host >> driver's the use a specific pinctrl state for this. >> >> > 3. Internal regulator for input(?) level on the data pins: >> > "vqmmc_ref" (I'm open to suggestions of a better name) > > This one is implemented in the pinctrl (pfc) block. I understand this as we should have a specific UHS pinctrl state, instead of a regulator. Right? [...] 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
