From: Dan Williams <dan.j.williams@intel.com>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
sboyd@codeaurora.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Rob Herring <robh+dt@kernel.org>, Mark Brown <broonie@kernel.org>,
Kumar Gala <galak@codeaurora.org>,
Matthew Porter <mporter@konsulko.com>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-api@vger.kernel.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v5 00/11] Add simple NVMEM Framework via regmap.
Date: Fri, 29 May 2015 14:44:33 -0700 [thread overview]
Message-ID: <CAA9_cmcfQ-cYHtQR63ENtygZwaz6OPFsXbmQEZBZesyJqC=qsw@mail.gmail.com> (raw)
In-Reply-To: <556810AB.40906@linaro.org>
On Fri, May 29, 2015 at 12:09 AM, Srinivas Kandagatla
<srinivas.kandagatla@linaro.org> wrote:
>
>
> On 29/05/15 02:20, Dan Williams wrote:
>>
>> On Thu, May 21, 2015 at 9:42 AM, Srinivas Kandagatla
>> <srinivas.kandagatla@linaro.org> wrote:
>>>
>>> Thankyou all for providing inputs and comments on previous versions of
>>> this patchset.
>>> Here is the v5 of the patchset addressing all the issues raised as
>>> part of previous versions review.
>>>
>>> This patchset adds a new simple NVMEM framework to kernel.
>>>
>>> Up until now, NVMEM drivers were stored in drivers/misc, where they all
>>> had to
>>> duplicate pretty much the same code to register a sysfs file, allow
>>> in-kernel
>>> users to access the content of the devices they were driving, etc.
>>>
>>> This was also a problem as far as other in-kernel users were involved,
>>> since
>>> the solutions used were pretty much different from on driver to another,
>>> there
>>> was a rather big abstraction leak.
>>>
>>> Introduction of this framework aims at solving this. It also introduces
>>> DT
>>> representation for consumer devices to go get the data they require (MAC
>>> Addresses, SoC/Revision ID, part numbers, and so on) from the NVMEMs.
>>>
>>> After learning few things about QCOM qfprom and other eeprom/efuses,
>>> which
>>> has packed fields at bit level. Which makes it important to add support
>>> to
>>> such memories. This version adds support to this type of non volatile
>>> memories by adding support to bit level nvmem-cells.
>>>
>>> Having regmap interface to this framework would give much better
>>> abstraction for nvmems on different buses.
>>>
>>> patch 1-2 Introduces two regmap helper functions.
>>> patch 3-6 Introduces the NVMEM framework.
>>> Patch 7 Adds helper functions for nvmems based on mmio.
>>> Patch 8 migrates an existing driver to nvmem framework.
>>> Patch 9-10 Adds Qualcomm specific qfprom driver.
>>> Patch 11 adds entry in MAINTAINERS.
>>>
>>> Its also possible to migrate other nvmem drivers to this framework.
>>>
>>> Providers APIs:
>>> nvmem_register/unregister();
>>>
>>> Consumers APIs:
>>> Cell based apis for both DT/Non-DT:
>>> nvmem_cell_get()/nvmem_cell_put();
>>> nvmem_cell_read()/nvmem_cell_write();
>>>
>>> Raw byte access apis for both DT/non-DT.
>>> nvmem_device_get()/nvmem_device_put()
>>> nvmem_device_read()/nvmem_device_write();
>>> nvmem_device_cell_read()/nvmem_device_cell_write();
>>>
>>> Device Tree:
>>>
>>> /* Provider */
>>> qfprom: qfprom@00700000 {
>>> ...
>>>
>>> /* Data cells */
>>> tsens_calibration: calib@404 {
>>> reg = <0x404 0x10>;
>>> };
>>>
>>> tsens_calibration_bckp: calib_bckp@504 {
>>> reg = <0x504 0x11>;
>>> bit-offset = 6;
>>> nbits = 128;
>>> };
>>>
>>> pvs_version: pvs-version@6 {
>>> reg = <0x6 0x2>
>>> bit-offset = 7;
>>> nbits = 2;
>>> };
>>>
>>> speed_bin: speed-bin@c{
>>> reg = <0xc 0x1>;
>>> bit-offset = 2;
>>> nbits = 3;
>>>
>>> };
>>> ...
>>> };
>>>
>>> userspace interface: binary file in /sys/class/nvmem/*/nvmem
>>>
>>> ex:
>>> hexdump /sys/class/nvmem/qfprom0/nvmem
>>>
>>> 0000000 0000 0000 0000 0000 0000 0000 0000 0000
>>> *
>>> 00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
>>> 0000000 0000 0000 0000 0000 0000 0000 0000 0000
>>> ...
>>> *
>>> 0001000
>>>
>>> Changes since v4(https://lkml.org/lkml/2015/3/30/725)
>>> * rename eeprom to nvmem suggested by Matt Porter
>>
>>
>> Apologies for the bikeshed fly-by review, but given we already have
>> NVME and are adding an NVDIMM driver sub-system is s/eeprom/nvmem/ a
>> good idea?
>>
> IMO yes.
>
> I did briefly looked at NVME before renaming the eeprom to nvmem,
> NVME is aimed at defining the command/feature set for PCIe-based SSDs with
> the goals of increased and efficient performance and interoperability.
>
> This patch-set introduces simple nvmem which is applicable for non volatile
> memories like efuses, eeprom, ROM, NVRAM .. etc, which are used in most
> boards/SBC's. Data like calibration table, mac address or opps, are
> generally stored this. This data is required by multiple drivers and
> currently there is no framework in the kernel to address/abstract this,
> resulting in code duplication.
Understood, but don't be surprised when people confuse NVMEM support
(sub to single digit megabyte capacities for firmware) and NVDIMM
support (multiple gigabyte capacities for i/o).
prev parent reply other threads:[~2015-05-29 21:44 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1425548685-12887-1-git-send-email-srinivas.kandagatla@linaro.org>
2015-03-13 9:49 ` [PATCH v2 0/7] Add simple EEPROM Framework via regmap Srinivas Kandagatla
2015-03-13 9:50 ` [PATCH v2 2/7] eeprom: Add a simple EEPROM framework for eeprom consumers Srinivas Kandagatla
2015-03-13 9:50 ` [PATCH v2 3/7] eeprom: Add bindings for simple eeprom framework Srinivas Kandagatla
2015-03-13 9:50 ` [PATCH v2 4/7] eeprom: sunxi: Move the SID driver to the " Srinivas Kandagatla
[not found] ` <1426240157-2383-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-13 9:50 ` [PATCH v2 1/7] eeprom: Add a simple EEPROM framework for eeprom providers Srinivas Kandagatla
[not found] ` <1426240214-2434-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-23 21:09 ` Mark Brown
[not found] ` <20150323210918.GS14954-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-03-23 22:05 ` Srinivas Kandagatla
[not found] ` <55108E2B.7050305-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-24 9:18 ` Srinivas Kandagatla
2015-03-24 17:23 ` Mark Brown
2015-03-24 18:34 ` Srinivas Kandagatla
2015-03-24 19:02 ` Mark Brown
2015-03-24 19:26 ` Srinivas Kandagatla
2015-03-24 20:55 ` Mark Brown
2015-03-13 9:50 ` [PATCH v2 5/7] eeprom: qfprom: Add Qualcomm QFPROM support Srinivas Kandagatla
2015-03-13 9:50 ` [PATCH v2 6/7] eeprom: qfprom: Add bindings for qfprom Srinivas Kandagatla
2015-03-13 9:51 ` [PATCH v2 7/7] eeprom: Add to MAINTAINERS for eeprom framework Srinivas Kandagatla
2015-03-24 22:28 ` [PATCH v3 0/9] Add simple EEPROM Framework via regmap Srinivas Kandagatla
2015-03-24 22:29 ` [PATCH v3 1/9] regmap: Introduce regmap_get_max_register Srinivas Kandagatla
2015-03-24 22:36 ` Mark Brown
2015-03-24 23:05 ` Srinivas Kandagatla
2015-03-24 23:23 ` Joe Perches
[not found] ` <1427236116-18531-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-24 22:30 ` [PATCH v3 2/9] regmap: Introduce regmap_get_reg_stride Srinivas Kandagatla
2015-03-24 22:37 ` Mark Brown
[not found] ` <20150324223745.GC28997-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-03-24 23:07 ` Srinivas Kandagatla
2015-03-24 22:30 ` [PATCH v3 7/9] eeprom: qfprom: Add Qualcomm QFPROM support Srinivas Kandagatla
2015-03-24 22:30 ` [PATCH v3 3/9] eeprom: Add a simple EEPROM framework for eeprom providers Srinivas Kandagatla
2015-03-24 22:53 ` Mark Brown
[not found] ` <20150324225317.GD28997-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-03-26 16:23 ` Srinivas Kandagatla
2015-03-24 22:30 ` [PATCH v3 4/9] eeprom: Add a simple EEPROM framework for eeprom consumers Srinivas Kandagatla
[not found] ` <1427236219-18709-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-25 7:16 ` Sascha Hauer
2015-03-25 12:29 ` Srinivas Kandagatla
2015-03-24 22:30 ` [PATCH v3 5/9] eeprom: Add bindings for simple eeprom framework Srinivas Kandagatla
2015-03-25 7:10 ` Sascha Hauer
2015-03-25 16:40 ` Maxime Ripard
2015-03-24 22:30 ` [PATCH v3 6/9] eeprom: sunxi: Move the SID driver to the " Srinivas Kandagatla
2015-03-24 22:31 ` [PATCH v3 8/9] eeprom: qfprom: Add bindings for qfprom Srinivas Kandagatla
2015-03-25 0:28 ` Bjorn Andersson
2015-03-24 22:31 ` [PATCH v3 9/9] eeprom: Add to MAINTAINERS for eeprom framework Srinivas Kandagatla
2015-03-30 21:54 ` [PATCH v4 00/10] Add simple EEPROM Framework via regmap Srinivas Kandagatla
2015-03-30 21:56 ` [PATCH v4 01/10] regmap: Introduce regmap_get_max_register Srinivas Kandagatla
2015-05-04 12:05 ` Mark Brown
2015-03-30 21:57 ` [PATCH v4 02/10] regmap: Introduce regmap_get_reg_stride Srinivas Kandagatla
2015-03-30 21:57 ` [PATCH v4 03/10] eeprom: Add a simple EEPROM framework for eeprom providers Srinivas Kandagatla
[not found] ` <1427752492-17039-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-03-30 21:57 ` [PATCH v4 04/10] eeprom: Add a simple EEPROM framework for eeprom consumers Srinivas Kandagatla
2015-04-07 18:45 ` Stephen Boyd
2015-04-07 20:09 ` Srinivas Kandagatla
2015-04-09 14:45 ` Stephen Boyd
2015-04-10 11:45 ` Maxime Ripard
[not found] ` <20150409144522.GB9663-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-05-05 11:46 ` Srinivas Kandagatla
2015-05-08 5:23 ` Sascha Hauer
2015-05-06 17:28 ` Mark Brown
2015-03-30 21:57 ` [PATCH v4 05/10] eeprom: Add bindings for simple eeprom framework Srinivas Kandagatla
[not found] ` <1427752679-17261-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-04-06 13:32 ` Matt Porter
2015-04-06 14:11 ` Rob Herring
[not found] ` <CAL_Jsq++9pyJMLXssgyz2WRU4e7ikT_6FwzWMo1fKS82FJvEyg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-06 15:04 ` Matt Porter
2015-04-07 17:35 ` Srinivas Kandagatla
2015-04-07 17:46 ` Mark Brown
2015-04-07 18:03 ` Srinivas Kandagatla
2015-04-07 19:46 ` Matt Porter
2015-04-08 9:24 ` Srinivas Kandagatla
2015-03-30 21:58 ` [PATCH v4 06/10] eeprom: Add simple eeprom-mmio consumer helper functions Srinivas Kandagatla
2015-03-30 21:58 ` [PATCH v4 07/10] eeprom: qfprom: Add Qualcomm QFPROM support Srinivas Kandagatla
2015-03-30 21:58 ` [PATCH v4 08/10] eeprom: qfprom: Add bindings for qfprom Srinivas Kandagatla
2015-03-30 21:58 ` [PATCH v4 09/10] eeprom: sunxi: Move the SID driver to the eeprom framework Srinivas Kandagatla
2015-03-30 21:58 ` [PATCH v4 10/10] eeprom: Add to MAINTAINERS for " Srinivas Kandagatla
2015-05-21 16:42 ` [PATCH v5 00/11] Add simple NVMEM Framework via regmap Srinivas Kandagatla
2015-05-21 16:42 ` [PATCH v5 01/11] regmap: Introduce regmap_get_max_register Srinivas Kandagatla
2015-05-22 11:18 ` Mark Brown
2015-05-21 16:42 ` [PATCH v5 02/11] regmap: Introduce regmap_get_reg_stride Srinivas Kandagatla
2015-05-22 11:19 ` Mark Brown
2015-05-21 16:43 ` [PATCH v5 03/11] nvmem: Add a simple NVMEM framework for nvmem providers Srinivas Kandagatla
[not found] ` <1432226583-8775-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-16 22:43 ` Stephen Boyd
[not found] ` <5580A678.4080304-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-06-18 12:46 ` Srinivas Kandagatla
[not found] ` <5582BDAE.5040008-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-24 0:24 ` Stephen Boyd
2015-06-24 10:05 ` Srinivas Kandagatla
2015-05-21 16:43 ` [PATCH v5 05/11] nvmem: Add nvmem_device based consumer apis Srinivas Kandagatla
2015-06-16 22:49 ` Stephen Boyd
[not found] ` <5580A7EA.2090909-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-06-18 12:57 ` Srinivas Kandagatla
2015-05-21 16:44 ` [PATCH v5 06/11] nvmem: Add bindings for simple nvmem framework Srinivas Kandagatla
2015-06-16 22:53 ` Stephen Boyd
[not found] ` <5580A900.9070902-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-06-18 13:01 ` Srinivas Kandagatla
[not found] ` <1432226652-8947-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-19 10:36 ` maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w
2015-06-19 10:59 ` Srinivas Kandagatla
2015-05-21 16:44 ` [PATCH v5 08/11] nvmem: qfprom: Add Qualcomm QFPROM support Srinivas Kandagatla
2015-06-16 23:00 ` Stephen Boyd
[not found] ` <5580AA9B.7040001-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-06-18 13:22 ` Srinivas Kandagatla
[not found] ` <1432226535-8640-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-05-21 16:43 ` [PATCH v5 04/11] nvmem: Add a simple NVMEM framework for consumers Srinivas Kandagatla
2015-06-16 22:29 ` Stephen Boyd
2015-06-17 8:00 ` Sascha Hauer
2015-06-18 12:56 ` Srinivas Kandagatla
2015-05-21 16:44 ` [PATCH v5 07/11] nvmem: Add simple nvmem-mmio consumer helper functions Srinivas Kandagatla
[not found] ` <1432226665-8994-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-16 22:58 ` Stephen Boyd
[not found] ` <5580AA05.90709-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-06-18 13:08 ` Srinivas Kandagatla
2015-05-21 16:44 ` [PATCH v5 09/11] nvmem: qfprom: Add bindings for qfprom Srinivas Kandagatla
[not found] ` <1432226685-9081-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-16 23:01 ` Stephen Boyd
2015-05-21 16:45 ` [PATCH v5 11/11] nvmem: Add to MAINTAINERS for nvmem framework Srinivas Kandagatla
2015-05-21 16:45 ` [PATCH v5 10/11] nvmem: sunxi: Move the SID driver to the " Srinivas Kandagatla
[not found] ` <1432226733-9243-1-git-send-email-srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-16 23:04 ` Stephen Boyd
2015-06-18 13:09 ` Srinivas Kandagatla
2015-05-25 16:51 ` [PATCH v5 00/11] Add simple NVMEM Framework via regmap Pantelis Antoniou
2015-05-26 9:12 ` Srinivas Kandagatla
[not found] ` <556438FF.7020105-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-05-26 17:54 ` Pantelis Antoniou
2015-05-29 1:20 ` Dan Williams
[not found] ` <CAA9_cmetqnqTQPCd8ya5AJPKQw8ary8CwsE6TUv=f57O=_MH5w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-29 7:09 ` Srinivas Kandagatla
2015-05-29 21:44 ` Dan Williams [this message]
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