From: Sylvain Rochet <gradator@gradator.net>
To: Maxime Bizon <mbizon@freebox.fr>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Mark Rutland <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Tony Lindgren <tony@atomide.com>,
Koen Kooi <koen@dominion.thruhere.net>,
Nicolas Ferre <nicolas.ferre@atmel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Grant Likely <grant.likely@secretlab.ca>,
Ludovic Desroches <ludovic.desroches@atmel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Matt Porter <matt.porter@linaro.org>,
frowand.list@gmail.com, Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH 2/4] of: DT quirks infrastructure
Date: Thu, 19 Feb 2015 19:12:18 +0100 [thread overview]
Message-ID: <20150219181218.GA5048@gradator.net> (raw)
In-Reply-To: <1424368919.13604.9.camel@sakura.staff.proxad.net>
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Hello,
On Thu, Feb 19, 2015 at 07:01:59PM +0100, Maxime Bizon wrote:
> On Thu, 2015-02-19 at 19:38 +0200, Pantelis Antoniou wrote:
>
> > Having to boot and tweak the bootloader settings to select the correct
> > dtb (even if it’s present on the flash medium) takes time and is
> > error-prone.
>
> Dedicate a set of GPIO for board/PCB revision detection (it only costs a
> few resistors connected to VCC or GND), then use that information to
> choose the correct DTB.
Or use a 1-wire or I2C EEPROM to store your board information.
Or, even better, if you have an I2C device, just chose a different
address on each board for this device and then probe I2C devices in your
boot loader until you found one you are looking for, this way, you don't
need spare GPIO at all. You don't even need to populate the same I2C
device on all boards, you can actually probe anything.
Sylvain
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WARNING: multiple messages have this Message-ID (diff)
From: Sylvain Rochet <gradator-XWGZPxRNpGHk1uMJSBkQmQ@public.gmane.org>
To: Maxime Bizon <mbizon-MmRyKUhfbQ9GWvitb5QawA@public.gmane.org>
Cc: Pantelis Antoniou
<pantelis.antoniou-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
Koen Kooi
<koen-QLwJDigV5abLmq1fohREcCpxlwaOVQ5f@public.gmane.org>,
Nicolas Ferre
<nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Grant Likely
<grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>,
Ludovic Desroches
<ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
Matt Porter <matt.porter-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
Subject: Re: [PATCH 2/4] of: DT quirks infrastructure
Date: Thu, 19 Feb 2015 19:12:18 +0100 [thread overview]
Message-ID: <20150219181218.GA5048@gradator.net> (raw)
In-Reply-To: <1424368919.13604.9.camel-MdnFuL0m/hCw+z8RR+d9WEZ2mhrpEnA6@public.gmane.org>
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Hello,
On Thu, Feb 19, 2015 at 07:01:59PM +0100, Maxime Bizon wrote:
> On Thu, 2015-02-19 at 19:38 +0200, Pantelis Antoniou wrote:
>
> > Having to boot and tweak the bootloader settings to select the correct
> > dtb (even if it’s present on the flash medium) takes time and is
> > error-prone.
>
> Dedicate a set of GPIO for board/PCB revision detection (it only costs a
> few resistors connected to VCC or GND), then use that information to
> choose the correct DTB.
Or use a 1-wire or I2C EEPROM to store your board information.
Or, even better, if you have an I2C device, just chose a different
address on each board for this device and then probe I2C devices in your
boot loader until you found one you are looking for, this way, you don't
need spare GPIO at all. You don't even need to populate the same I2C
device on all boards, you can actually probe anything.
Sylvain
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WARNING: multiple messages have this Message-ID (diff)
From: gradator@gradator.net (Sylvain Rochet)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/4] of: DT quirks infrastructure
Date: Thu, 19 Feb 2015 19:12:18 +0100 [thread overview]
Message-ID: <20150219181218.GA5048@gradator.net> (raw)
In-Reply-To: <1424368919.13604.9.camel@sakura.staff.proxad.net>
Hello,
On Thu, Feb 19, 2015 at 07:01:59PM +0100, Maxime Bizon wrote:
> On Thu, 2015-02-19 at 19:38 +0200, Pantelis Antoniou wrote:
>
> > Having to boot and tweak the bootloader settings to select the correct
> > dtb (even if it?s present on the flash medium) takes time and is
> > error-prone.
>
> Dedicate a set of GPIO for board/PCB revision detection (it only costs a
> few resistors connected to VCC or GND), then use that information to
> choose the correct DTB.
Or use a 1-wire or I2C EEPROM to store your board information.
Or, even better, if you have an I2C device, just chose a different
address on each board for this device and then probe I2C devices in your
boot loader until you found one you are looking for, this way, you don't
need spare GPIO at all. You don't even need to populate the same I2C
device on all boards, you can actually probe anything.
Sylvain
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next prev parent reply other threads:[~2015-02-19 18:13 UTC|newest]
Thread overview: 150+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-18 14:59 [PATCH 0/4] Device Tree Quirks & the Beaglebone Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-18 14:59 ` [PATCH 1/4] arm: of: Add a DT quirk method after unflattening Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-18 14:59 ` [PATCH 2/4] of: DT quirks infrastructure Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-18 15:41 ` Mark Rutland
2015-02-18 15:41 ` Mark Rutland
2015-02-18 15:41 ` Mark Rutland
2015-02-18 15:53 ` Pantelis Antoniou
2015-02-18 15:53 ` Pantelis Antoniou
2015-02-18 15:53 ` Pantelis Antoniou
2015-02-18 16:32 ` Ludovic Desroches
2015-02-18 16:32 ` Ludovic Desroches
2015-02-18 16:32 ` Ludovic Desroches
2015-02-18 16:39 ` Pantelis Antoniou
2015-02-18 16:39 ` Pantelis Antoniou
2015-02-18 16:39 ` Pantelis Antoniou
2015-02-18 16:47 ` Ludovic Desroches
2015-02-18 16:47 ` Ludovic Desroches
2015-02-18 16:47 ` Ludovic Desroches
2015-02-18 16:46 ` Matt Porter
2015-02-18 16:46 ` Matt Porter
2015-02-18 16:46 ` Matt Porter
2015-02-18 17:31 ` Mark Rutland
2015-02-18 17:31 ` Mark Rutland
2015-02-18 17:31 ` Mark Rutland
2015-02-18 19:32 ` Guenter Roeck
2015-02-18 19:32 ` Guenter Roeck
2015-02-18 19:32 ` Guenter Roeck
2015-02-19 14:29 ` Pantelis Antoniou
2015-02-19 14:29 ` Pantelis Antoniou
2015-02-19 14:29 ` Pantelis Antoniou
2015-02-19 16:48 ` Frank Rowand
2015-02-19 16:48 ` Frank Rowand
2015-02-19 16:48 ` Frank Rowand
2015-02-19 17:00 ` Pantelis Antoniou
2015-02-19 17:00 ` Pantelis Antoniou
2015-02-19 17:00 ` Pantelis Antoniou
2015-02-19 17:30 ` Frank Rowand
2015-02-19 17:30 ` Frank Rowand
2015-02-19 17:30 ` Frank Rowand
2015-02-19 17:38 ` Pantelis Antoniou
2015-02-19 17:38 ` Pantelis Antoniou
2015-02-19 17:38 ` Pantelis Antoniou
2015-02-19 18:01 ` Maxime Bizon
2015-02-19 18:01 ` Maxime Bizon
2015-02-19 18:01 ` Maxime Bizon
2015-02-19 18:12 ` Sylvain Rochet [this message]
2015-02-19 18:12 ` Sylvain Rochet
2015-02-19 18:12 ` Sylvain Rochet
2015-02-19 18:22 ` Maxime Bizon
2015-02-19 18:22 ` Maxime Bizon
2015-02-19 18:22 ` Maxime Bizon
2015-02-20 14:21 ` Peter Hurley
2015-02-20 14:21 ` Peter Hurley
2015-02-20 14:21 ` Peter Hurley
2015-02-20 14:35 ` Ludovic Desroches
2015-02-20 14:35 ` Ludovic Desroches
2015-02-20 14:35 ` Ludovic Desroches
2015-02-20 15:00 ` Peter Hurley
2015-02-20 15:00 ` Peter Hurley
2015-02-20 15:00 ` Peter Hurley
2015-02-20 15:02 ` Pantelis Antoniou
2015-02-20 15:02 ` Pantelis Antoniou
2015-02-20 15:02 ` Pantelis Antoniou
2015-02-20 15:24 ` Peter Hurley
2015-02-20 15:24 ` Peter Hurley
2015-02-20 15:24 ` Peter Hurley
2015-02-20 15:38 ` Pantelis Antoniou
2015-02-20 15:38 ` Pantelis Antoniou
2015-02-20 15:38 ` Pantelis Antoniou
2015-02-20 16:34 ` Peter Hurley
2015-02-20 16:34 ` Peter Hurley
2015-02-20 16:34 ` Peter Hurley
2015-02-20 16:49 ` Pantelis Antoniou
2015-02-20 16:49 ` Pantelis Antoniou
2015-02-20 16:49 ` Pantelis Antoniou
2015-02-20 17:30 ` Rob Herring
2015-02-20 17:30 ` Rob Herring
2015-02-20 17:30 ` Rob Herring
2015-02-20 17:37 ` Pantelis Antoniou
2015-02-20 17:37 ` Pantelis Antoniou
2015-02-20 17:37 ` Pantelis Antoniou
2015-02-23 7:00 ` Ludovic Desroches
2015-02-23 7:00 ` Ludovic Desroches
2015-02-23 7:00 ` Ludovic Desroches
2015-02-20 14:38 ` Pantelis Antoniou
2015-02-20 14:38 ` Pantelis Antoniou
2015-02-20 14:38 ` Pantelis Antoniou
2015-02-20 16:47 ` Guenter Roeck
2015-02-20 16:47 ` Guenter Roeck
2015-02-20 16:47 ` Guenter Roeck
2015-02-20 18:09 ` Peter Hurley
2015-02-20 18:09 ` Peter Hurley
2015-02-20 18:09 ` Peter Hurley
2015-02-20 18:48 ` Guenter Roeck
2015-02-20 18:48 ` Guenter Roeck
2015-02-20 18:48 ` Guenter Roeck
2015-02-23 7:30 ` Ludovic Desroches
2015-02-23 7:30 ` Ludovic Desroches
2015-02-23 7:30 ` Ludovic Desroches
2015-02-20 8:04 ` Ludovic Desroches
2015-02-20 8:04 ` Ludovic Desroches
2015-02-20 8:04 ` Ludovic Desroches
2015-02-19 2:08 ` Frank Rowand
2015-02-19 2:08 ` Frank Rowand
2015-02-19 14:41 ` Pantelis Antoniou
2015-02-19 14:41 ` Pantelis Antoniou
2015-02-19 16:40 ` Frank Rowand
2015-02-19 16:40 ` Frank Rowand
2015-02-19 16:51 ` Frank Rowand
2015-02-19 16:51 ` Frank Rowand
2015-02-19 16:51 ` Frank Rowand
2015-02-20 13:23 ` Peter Hurley
2015-02-20 13:23 ` Peter Hurley
2015-02-19 18:01 ` Rob Herring
2015-02-19 18:01 ` Rob Herring
2015-02-19 18:01 ` Rob Herring
2015-02-19 18:12 ` Guenter Roeck
2015-02-19 18:12 ` Guenter Roeck
2015-02-19 18:12 ` Guenter Roeck
2015-02-20 8:16 ` Ludovic Desroches
2015-02-20 8:16 ` Ludovic Desroches
2015-02-20 8:16 ` Ludovic Desroches
2015-02-18 14:59 ` [PATCH 3/4] arm: am33xx: DT quirks for am33xx based beaglebone variants Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-19 18:16 ` Tony Lindgren
2015-02-19 18:16 ` Tony Lindgren
2015-02-19 18:16 ` Tony Lindgren
2015-02-19 18:28 ` Pantelis Antoniou
2015-02-19 18:28 ` Pantelis Antoniou
2015-02-19 18:36 ` Tony Lindgren
2015-02-19 18:36 ` Tony Lindgren
2015-02-19 18:36 ` Tony Lindgren
2015-02-19 18:44 ` Pantelis Antoniou
2015-02-19 18:44 ` Pantelis Antoniou
2015-02-19 18:44 ` Pantelis Antoniou
2015-02-23 18:39 ` Peter Hurley
2015-02-23 18:39 ` Peter Hurley
2015-02-23 18:48 ` Pantelis Antoniou
2015-02-23 18:48 ` Pantelis Antoniou
2015-02-19 18:57 ` Guenter Roeck
2015-02-19 18:57 ` Guenter Roeck
2015-02-20 16:13 ` Jon Hunter
2015-02-20 16:13 ` Jon Hunter
2015-02-18 14:59 ` [PATCH 4/4] arm: dts: Common Black/White Beaglebone DTS using quirks Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
2015-02-18 14:59 ` Pantelis Antoniou
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