Re: [PATCH 6/7] pinctrl: tegra: Add DT binding for io pads control

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 04/12/2016 08:56 AM, Laxman Dewangan wrote:
NVIDIA Tegra210 supports the IO pads which can operate at 1.8V
or 3.3V I/O voltage levels. Also IO pads can be configured for
power down state if it is not in used. SW needs to configure the
voltage level of IO pads based on IO rail voltage and its power
state based on platform usage.

Add DT binding document for detailing the DT properties for
configuring IO pads voltage levels and its power state.

I hope that we only intend to use this in the case where Linux must make dynamic changes to the IO voltage (e.g. SD cards switching between speeds).

All static settings, and good boot defaults, should be set up by system FW. Perhaps not all FW does this on Tegra210 platforms:-( I hope that on future chips, the same FW that sets up the static pinmux sets up the static IO voltage configuration, in exactly the same way.
--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux SPI]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux