From: stefan.wahren@i2se.com (Stefan Wahren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V4 RFC 2/3] nvmem: add driver for ocotp in i.MX23 and i.MX28
Date: Mon, 20 Jul 2015 08:45:21 +0200 [thread overview]
Message-ID: <55AC9901.1040402@i2se.com> (raw)
In-Reply-To: <201507200012.13608.marex@denx.de>
Hi Marek,
Am 20.07.2015 um 00:12 schrieb Marek Vasut:
> On Monday, July 20, 2015 at 12:04:58 AM, Stefan Wahren wrote:
>> This patch brings read-only support for the On-Chip OTP cells
>> in the i.MX23 and i.MX28 processor. The driver implements the
>> new NVMEM provider API.
>>
>> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
> How come this driver isn't doing any manipulation with the VDDIO
> voltage -- or did I miss that? I seem to remember that the VDDIO
> had to be lowered to 2.8V before the fuses could be programmed
> and restored to 3.3V afterward. See for example recent mainline
> u-boot, drivers/misc/mxs_ocotp.c .
Why should the driver implement VDDIO manipulation when there is only
read-only support for the OTP bits? There is no ambition to implement
write support. Maybe i should clarify that in the comments.
Btw i'm on your side that because programming the OTP from userspace is
to dangerous.
Best regards
Stefan
>
> Best regards,
> Marek Vasut
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
To: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Fabio Estevam
<fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Sanchayan Maity
<maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Srinivas Kandagatla
<srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH V4 RFC 2/3] nvmem: add driver for ocotp in i.MX23 and i.MX28
Date: Mon, 20 Jul 2015 08:45:21 +0200 [thread overview]
Message-ID: <55AC9901.1040402@i2se.com> (raw)
In-Reply-To: <201507200012.13608.marex-ynQEQJNshbs@public.gmane.org>
Hi Marek,
Am 20.07.2015 um 00:12 schrieb Marek Vasut:
> On Monday, July 20, 2015 at 12:04:58 AM, Stefan Wahren wrote:
>> This patch brings read-only support for the On-Chip OTP cells
>> in the i.MX23 and i.MX28 processor. The driver implements the
>> new NVMEM provider API.
>>
>> Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
> How come this driver isn't doing any manipulation with the VDDIO
> voltage -- or did I miss that? I seem to remember that the VDDIO
> had to be lowered to 2.8V before the fuses could be programmed
> and restored to 3.3V afterward. See for example recent mainline
> u-boot, drivers/misc/mxs_ocotp.c .
Why should the driver implement VDDIO manipulation when there is only
read-only support for the OTP bits? There is no ambition to implement
write support. Maybe i should clarify that in the comments.
Btw i'm on your side that because programming the OTP from userspace is
to dangerous.
Best regards
Stefan
>
> Best regards,
> Marek Vasut
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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next prev parent reply other threads:[~2015-07-20 6:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-19 22:04 [PATCH V4 RFC 0/3] nvmem: add ocotp support for i.MX23 and i.MX28 Stefan Wahren
2015-07-19 22:04 ` Stefan Wahren
2015-07-19 22:04 ` [PATCH V4 RFC 1/3] DT: nvmem: add binding for mxs-ocotp Stefan Wahren
2015-07-19 22:04 ` Stefan Wahren
2015-07-19 22:04 ` [PATCH V4 RFC 2/3] nvmem: add driver for ocotp in i.MX23 and i.MX28 Stefan Wahren
2015-07-19 22:04 ` Stefan Wahren
2015-07-19 22:12 ` Marek Vasut
2015-07-19 22:12 ` Marek Vasut
2015-07-20 6:45 ` Stefan Wahren [this message]
2015-07-20 6:45 ` Stefan Wahren
2015-07-20 8:15 ` Marek Vasut
2015-07-20 8:15 ` Marek Vasut
2015-07-19 22:04 ` [PATCH V4 RFC 3/3] mxs: enable ocotp for " Stefan Wahren
2015-07-19 22:04 ` Stefan Wahren
2015-07-19 22:07 ` [PATCH V4 RFC 0/3] nvmem: add ocotp support " Marek Vasut
2015-07-19 22:07 ` Marek Vasut
2015-07-20 6:37 ` Stefan Wahren
2015-07-20 6:37 ` Stefan Wahren
2015-07-20 8:16 ` Marek Vasut
2015-07-20 8:16 ` Marek Vasut
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