Christoph,
On 12.12.2018, at 01:57, Christoph Muellner christoph.muellner@theobroma-systems.com wrote:
This patch series allows to tune VDD_LOG on RK3399-Q7 Puma boards to a voltage level defined in the DTS using a PWM adjustable regulator.
To do so a reimplemenation of the RK3399 pinctrl driver has been done. Although the new pinctrl driver is written in a way, that we could merge it with other rockchip pinctrl drivers, this is has not been done as part of this series.
As discussed today, when I came by your desk: thanks for taking this on; it had been on my wish-list for a long time.
Given the fact that this may have unintended side-effects for some of the other RK3399 boards, I am considering to hold this back until the next merge window (even though I know that we’d like to change the vdd_log setting as soon as possible to properly support the one use-case that triggered this entire effort).
The effect of the series is, that VDD_LOG will be set to about 950 mV on Puma. This is required to address stability issues on Puma. As a side effect, the pinctrl settings of all RK3399 boards will be configured according to the description in the DTS.
I wonder if we should add a transitional Kconfig entry to enable this only for boards that opt-in for the current release… this would allow us to pull this in for 2019.1 and then make it an unconditional feature starting early in the next merge-window.
Philipp.