Commits
Ravikumar Kattekola committed 54d44bde0a6
mmc: host: omap_hsmmc: Enable io voltage switch to 3.3V The mmc ip on OMAPx/DRA7x platforms supports io operation at 3.3v but it has been trimmed to 3.0v in order to align with the PBIAS cell supported voltage, as documented in the reference manuals. PBIAS cell is an additional hw component on the chip external to the mmc ip that provides an internal bias voltage reference needed for reliable operation of the ios - on dual voltage capable mmc instances. Reference manuals of OMAP5x and DRA7x have been updated to reflect the PBIAS regulator max-voltage as 3.3V instead of 3.0V, while OMAP3x and OMAP4x are still quoting 3.0V. So, as of now, the mmc driver needs to support both 3.0V and 3.3V IO voltage based on the max-voltage supported by the PBIAS regulator. Document reference: SWPU249AF - OMAP543x Technical reference manual - August 2016 SPRUI30C – DRA75x, DRA74x Technical reference manual November 2016 Tested on: DRA75x PG 2.0 REV H EVM Signed-off-by: Ravikumar Kattekola <rk@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>