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> https://github.com/rockchip-linux/kernel/issues/77 Hi all, I also met with this issue, i2c op is not possible, and the wired thing is GPIO also cannot set high.
<levd1> Seems the clock is not available at `probe` function.
<levd1> mmind00: any hint? I see the same usage in ov13858 driver in Chrome OS.
<mmind00> levd1: no idea ... which what kernel did you experience this [mainline?]
<levd1> the vendor kernel 4.4
<levd1> I just work around this problem using kernel module
<mmind00> levd1: just checked ISP driver didn't make it into mainline yet ... but I also do not do support for the vendor-kernel
<levd1> got it. i just wonder why :)
<beeble> i would guess since the i2c driver is not yet loaded the pinmux will also not be configured. you will need to defer the isp probe until i2c is available
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<beeble> on how to do that correctly, no idea :)
<levd1> in drivers/Makefile, pinctrl is placed before i2c, therefore it must be initialized before i2c.
<beeble> the order in the makefile does not influence the order drivers will probed at all
<levd1> then what determinate the order?
<beeble> thats handled on-demand with devicetree and in parallel.
<levd1> you are right. I also check the kernel log, pinctrl is initialized before i2c.
<mmind00> pinctrl should be initialized early on ... but the isp thingy should probably be initialized after i2c
<mmind00> or in any case isp should defer if i2c is not yet available ... normally I'd expect the driver to do this already, but that may be a bug in said driver
<levd1> the sensor is being power/clock on to read the sensor id in the probe function, which is not related to isp thingy yet
<levd1> clocks should be initialized earlier than pinctrl. I just wonder why I cannot turn on the SCLK_CIF_OUT clock and set the power gpio pin high.
<levd1> if i compile it as a kernel module and insmod it after system startup, all is normal
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