Date: Thu, 21 May 2015 08:25:39 -0600 From: Ian Lepore <ian@freebsd.org> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: hackers@freebsd.org, current@freebsd.org Subject: Re: OF_getprop weirdness - raspberry pi Message-ID: <1432218339.1208.1.camel@freebsd.org> In-Reply-To: <D0B40E58-32EB-4CFE-950E-78EAA05E9018@cs.huji.ac.il> References: <D0B40E58-32EB-4CFE-950E-78EAA05E9018@cs.huji.ac.il>
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On Thu, 2015-05-21 at 09:41 +0300, Daniel Braniss wrote:
> Hi,
> I’m running current as of last week on a raspberry pi B.
>
> i don’t know if this only related to arm, but this is what I have in my rpi-b.dts:
> ….
> spi0 {
> rfid0 {
> compatible = "rfid,mfrc5";
> spi-chipselect = <0>;
> reset {
> compatible = "pcd-reset";
> gpios = <&gpio 6 2>;
> };
> lock {
> compatible = "lock-1";
> gpios = <&gpio 13 2>;
> };
> sense {
> compatible = "sense-1";
> gpios = <&gpio 19 1>;
> };
> };
> …
> and a call to
> uint32_t data[3];
>
> OF_getprop(node, “gpios”, data, sizeof(data)); // node is ‘pcd-reset'
> returns:
> data[0]: 0x03000000
> data[1]: 0x06000000
> data[2]: 0x02000000
>
> which looks to me that it’s in the wrong endian?
>
> cheers,
> danny
FDT data is always big-endian, use OF_getencprop() to unpack it to host
format.
-- Ian
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