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Subject: Re: OF_getprop weirdness - raspberry pi
From: Daniel Braniss <danny@cs.huji.ac.il>
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Date: Fri, 22 May 2015 08:27:30 +0300
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To: Ian Lepore <ian@FreeBSD.org>
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> On May 21, 2015, at 5:25 PM, Ian Lepore <ian@FreeBSD.org> wrote:
>=20
> On Thu, 2015-05-21 at 09:41 +0300, Daniel Braniss wrote:
>> Hi,
>> I=E2=80=99m running current as of last week on a raspberry pi B.
>>=20
>> i don=E2=80=99t know if this only related to arm, but this is what I =
have in my rpi-b.dts:
>> 	=E2=80=A6.
>> 		spi0 {
>> 		     rfid0 {
>> 		     	   compatible =3D "rfid,mfrc5";
>> 			   spi-chipselect =3D <0>;
>> 			   reset {
>> 			   	 compatible =3D "pcd-reset";
>> 				 gpios =3D <&gpio 6 2>;
>> 			   };
>> 			   lock {
>> 			   	compatible =3D "lock-1";
>> 				gpios =3D <&gpio 13 2>;
>> 			   };
>> 			   sense {
>> 			   	 compatible =3D "sense-1";
>> 				 gpios =3D <&gpio 19 1>;
>> 			   };=20
>> 		     };
>> =E2=80=A6
>> and a call to
>> 	uint32_t data[3];
>> =09
>> 	OF_getprop(node, =E2=80=9Cgpios=E2=80=9D, data, sizeof(data)); =
// node is =E2=80=98pcd-reset'
>> 	returns:
>> 		data[0]: 0x03000000
>> 		data[1]: 0x06000000
>> 		data[2]: 0x02000000
>>=20
>> which looks to me that it=E2=80=99s in the wrong endian?
>>=20
>> cheers,
>> 	danny
>=20
> FDT data is always big-endian, use OF_getencprop() to unpack it to =
host
> format.
>=20

thanks!
is there (apart from the source), some man pages, doc? so far I found =
outdated,
or incomplete info.

	danny

> -- Ian