ChanServ changed the topic of #linux-rockchip to: Rockchip development discussion | IRC log http://irclog.whitequark.org/linux-rockchip | Community GH https://github.com/linux-rockchip | Rockchip GH https://github.com/rockchip-linux | ML https://groups.google.com/group/linux-rockchip
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<levd1> mmind00: search `gpiomut_pmuio_iout` in RK3328 TRM, which is controled by bit[1] of GRF_SOC_CON10. This pin is used as `SDIO_PER` switch of 1.8V/3.3 VCCIO_SD in ROC-RK3328-CC schematic diagram (http://www.t-firefly.com/download/ROC-RK3288-CC/ROC-RK3328-CC-V1.0-A_yl.pdf).
<levd1> mmind00: It was numbered gpio0-d1 so that it can be specially treated in gpio-regulator driver (see workaround at https://github.com/FireflyTeam/kernel/blob/release-4.4/drivers/regulator/gpio-regulator.c#L101-L108, which is sth not mainlineable).
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<levd1> mmind00: perhaps that gpio really fits the gpio-syscon. But it is really non-trivial to add new gpio to gpio-syscon.
<mmind00> levd1: correct ... adding a rk3328-specific gpio-sycon entry is the way to go
<mmind00> levd1: i.e. real devicetrees definitly do not want all that config-voodoo vendor trees do ... see for example the type-c magic register values moving again from the dt back into the driver
<levd1> but if added that gpio is specific to rk3328 and perhaps used only in roc-rk3328-cc board.
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<mmind00> levd1: yes, that is a rk3328-specific gpio and should be added as such [you could check if there are more than this one]
<mmind00> levd1: and you cannot really predict what future boards will do
<levd1> mmind00: thank you very much for the hint. I'll prepare a patch to the mail list and see the response.
<mmind00> levd1: glad to help
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