linux-kernel - Re: [PATCH] ARM: OMAP2+: am335x-bone*: add DT for BeagleBone Black

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Date:	Fri, 6 Sep 2013 09:10:40 +0200
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	George Cherian <george.cherian@...com>
Cc:	<linux-omap@...r.kernel.org>, <bcousson@...libre.com>,
	<tony@...mide.com>, <rob.herring@...xeda.com>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<swarren@...dotorg.org>, <ijc+devicetree@...lion.org.uk>,
	<linux@....linux.org.uk>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <olof@...om.net>
Subject: Re: [PATCH] ARM: OMAP2+: am335x-bone*: add DT for BeagleBone Black


Op 6 sep. 2013, om 08:57 heeft George Cherian <george.cherian@...com> het volgende geschreven:

> On 9/6/2013 12:03 PM, Koen Kooi wrote:
>> The BeagleBone Black is basically a regular BeagleBone with eMMC and HDMI added,
>> so create a common dtsi both can use. MMC support for AM335x still isn't in, so
>> only the LDO change has been added.
>> 
>> Signed-off-by: Koen Kooi <koen@...inion.thruhere.net>
>> ---
>>  .../{am335x-bone.dts => am335x-bone-common.dtsi}   |   3 -
>>  arch/arm/boot/dts/am335x-bone.dts                  | 256 +--------------------
>>  arch/arm/boot/dts/am335x-boneblack.dts             |  18 ++
>>  3 files changed, 19 insertions(+), 258 deletions(-)
>>  copy arch/arm/boot/dts/{am335x-bone.dts => am335x-bone-common.dtsi} (99%)
>>  create mode 100644 arch/arm/boot/dts/am335x-boneblack.dts
> How did you test am335x-boneblack.dtb? where are the Makefile changes for boneblack?

Ah, I missed the makefile in my commit. I have a bunch of other patches on top to make more stuff work.

[..]

>> 
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/am335x-boneblack.dts
>> @@ -0,0 +1,18 @@
>> +/*
>> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +/dts-v1/;
>> +
>> +#include "am33xx.dtsi"
> Why cant we add am33xx.dtsi  in am335x-bone-common.dtsi ?

That didn't work when I tried it. It did work before the preprocessor changes when using /include/

>> +#include "am335x-bone-common.dtsi"
>> +
>> +&ldo3_reg {
>> +	regulator-min-microvolt = <1800000>;
>> +	regulator-max-microvolt = <1800000>;
>> +	regulator-always-on;
>> +};
>> +
> With this ldo values mmc was not working for me on Boneblack.
> got it working with
> 
> &ldo3_reg {
> 	regulator-min-microvolt = <1800000>;
> 	regulator-max-microvolt = <3300000>;
> 	regulator-always-on;
> };

That LDO is shared, the other consumer will get fried if you use 3.3V. I forget if it's DDR3 or HDMI.--
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