Date: Fri, 20 Dec 2019 10:07:13 +0200 From: Nick Kostirya <nikolay.kostirya@i11.co> To: Ian Lepore <ian@freebsd.org> Cc: Milan Obuch <milan@obuch.sk>, freebsd-arm@freebsd.org Subject: Re: gpioiic FDT overlays for sun8i-h3 Message-ID: <20191220100713.38c19fdb@i11.co> In-Reply-To: <78c7d14bb681f8bca11525bf61cf871c6e89c235.camel@freebsd.org> References: <20191128152901.39dbeb4d@thinkpad> <20191128062149.577be86eb7dc15ae5805f31a@bidouilliste.com> <20191129153754.28fb5763@thinkpad> <20191129144316.739c8664@zeta.dino.sk> <20191129155431.05d4e14f@thinkpad> <20191129150944.67a2b723a6724c46f7559f96@bidouilliste.com> <0ce78262af1dd3b404b9a85a780933d7e11f008e.camel@freebsd.org> <20191129201244.0bc85b09@thinkpad> <ee0593a31a64ba264d579f7a4548f6b1b6e948fe.camel@freebsd.org> <20191219095935.6fed7431@i11.co> <78c7d14bb681f8bca11525bf61cf871c6e89c235.camel@freebsd.org>
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On Thu, 19 Dec 2019 10:29:16 -0700
Ian Lepore <ian@freebsd.org> wrote:
> The gpioiic node needs to be defined at the root of the devicetree, not
> under the pinctrl node. Assuming that all pins are configured as gpios
> by default (they are on most SOCs) you probably don't need a pinctrl
> node for them at all. If you do, someone who knows allwinner stuff
> better than me would have to provide an example of that part.
>
> To add the gpioiic driver node using pins 0 and 2 like your example, I
> think it should be just this:
>
> /dts-v1/;
> /plugin/;
>
> / {
> compatible = "allwinner,sun8i-h3";
> };
>
> &{/} {
> gpioiic@0 {
> compatible = "i2c-gpio";
> scl-gpios =
> <&pio 0 0 GPIO_ACTIVE_HIGH>;
> sdl-gpios = <&pio 0 2
> GPIO_ACTIVE_HIGH>;
> };
>
> That should be enough to attach the i2c bus and the iic driver which
> will give you a /dev/iic# node for userland access to the bus. If you
> want to add slave devices that have kernel drivers, they get added as
> child nodes within gpioiic@0, like this:
>
> &{/} {
> gpioiic@0 {
> compatible = "i2c-gpio";
> scl-gpios = <&pio 0 0 GPIO_ACTIVE_HIGH>;
> sdl-gpios = <&pio 0 2 GPIO_ACTIVE_HIGH>;
>
> eeprom@50 {
> compatible = "atmel,24c512";
> reg = <0x50>;
> };
> rtc@51 {
> compatible="nxp,pcf2127";
> reg = <0x51>;
> };
> };
> };
>
> -- Ian
>
It is works!
Thank you very much!
Nick.
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