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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<suniel> Hi everyone.
<suniel> I have a situation. I have a carrier board with wifi/bt chip on SDIO/UART.
<suniel> This wifi chip is driven by a 32KHz external oscillator. The power to thisoscillator is +3v3 from a regulator whose input is 5V.
<suniel> How to write device tree node to enable the oscillator ? so that it candrive the wifi/bt chip.
<suniel> this is my external clock node:
<suniel> xin32k: xin32k { compatible = "fixed-clock"; #clock-cells = <0>; clock-frequency = <32768>; clock-output-names = "xin32k"; };
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<inode> have you got a power sequence provider node configured for it? (ie. compatible = "mmc-pwrseq-simple")
<robmur01> suniel: look up mmc-pwrseq - that's usually how those clocks are handled
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<suniel> yes, i have that in place
<suniel> sdio_pwrseq: sdio-pwrseq { compatible = "mmc-pwrseq-simple"; clocks = <&xin32k>; clock-names = "ext_clock"; pinctrl-names = "default"; pinctrl-0 = <&wifi_enable_h>; reset-gpios = <&gpio1 RK_PC3 GPIO_ACTIVE_LOW>; status = "okay"; };
<suniel> what i understand is, that this external oscillator activates only with a 3.3v supply. how do i inform this fixed oscillator(xin32k) to use 3.3v ?
<robmur01> so it's really a standalone oscillator with its own switchable supply, not just an output from an RTC chip or some other component?
<robmur01> that's a little atypical, and I guess none of the existing bindings/drivers support it
<robmur01> short of adding regulator support to fixed-clock, I'd be tempted to just bodge the power tree such that the OS thinks that regulator is supplying some other device/regulator that does get claimed at an appropriate point
<inode> i'm going to bet it's an hym8563 hiding behind door number xin32k
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<suniel> inode, hym8563 is not hiding
<suniel> its an external oscillator
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<inode> isn't Vdd fixed then?
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<suniel> yes i think so, vdd is fixed
<inode> sorry, didn't see your xin32k node snippet earlier
<inode> do you need the clock and pinctrl config in your pwrseq though? does your wifi_enable_h specify the same pin as reset-gpio?
<suniel> yes
<inode> which module are you using?
<suniel> its a Sterling-LWBTM 2.4 GHz Wi-Fi® and Bluetooth® SmartReady Multi-Standard Module.
<suniel> based on broadcom brcm4343w chipset
<inode> do you have a datasheet or at least the pin config for it?
<suniel> yes i have
<suniel> i have the board schematic on which this wifi/bt is installed
<inode> if that broadcom chip is anything like a realtek sdio module i have, there are two active low disable pins (wlan & bluetooth) that have both to be toggled to initialize the radio for wlan operation
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