From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: "Noralf Trønnes" <noralf@tronnes.org>
Cc: Felipe Balbi <balbi@kernel.org>, Mark Brown <broonie@kernel.org>,
Lee Jones <lee.jones@linaro.org>, USB <linux-usb@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [RFC 0/9] Regmap over USB for Multifunction USB Device (gpio, display, ...)
Date: Tue, 18 Feb 2020 22:57:15 +0200 [thread overview]
Message-ID: <CAHp75Vc6=V=cXM0mmh88V6XLmJT6kFnJCS547vgxX0zBG+cTZQ@mail.gmail.com> (raw)
In-Reply-To: <20200216172117.49832-1-noralf@tronnes.org>
On Sun, Feb 16, 2020 at 7:30 PM Noralf Trønnes <noralf@tronnes.org> wrote:
>
> Hi,
>
> A while back I had the idea to turn a Raspberry Pi Zero into a $5
> USB to HDMI/SDTV/DSI/DPI display adapter.
>
> Thinking about how to represent the display to the driver I realised
> that hardware use registers as API. And Linux does have a generic
> register abstraction: regmap. Furthermore this means that if I can do a
> regmap over USB implementation, it will be easy to do other functions
> like gpio, adc and others. After a few iterations trying to understand
> the USB subsystem and satisfying driver requirements, I now have
> something that looks promising.
>
> I'm sending out an early version hoping to get feedback especially on
> the core parts that handles regmap and interrupts.
>
> Overview:
>
> USB Host : USB Device
> :
> -------------- : ------------------
> ---------- | mfd: mud | : | f_mud | ----------
> | Driver | -------------- : | | | Driver |
> ---------- | regmap-usb | : | (mud_regmap) | ----------
> -------------- : ------------------
>
>
> I've attached 2 drivers:
> - gpio/pinctrl: is more or less finished
> - display: needs a lot more work
Can regmap-usb be used for drivers/mfd/dln2.c for example?
--
With Best Regards,
Andy Shevchenko
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-02-18 20:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-16 17:21 [RFC 0/9] Regmap over USB for Multifunction USB Device (gpio, display, ...) Noralf Trønnes
2020-02-16 17:21 ` [RFC 1/9] regmap: Add USB support Noralf Trønnes
2020-02-17 12:11 ` Mark Brown
2020-02-17 21:33 ` Noralf Trønnes
2020-02-17 21:39 ` Mark Brown
2020-02-17 22:15 ` Noralf Trønnes
2020-02-17 22:44 ` Mark Brown
2020-02-16 17:21 ` [RFC 2/9] mfd: Add driver for Multifunction USB Device Noralf Trønnes
2020-02-27 9:09 ` Lee Jones
2020-02-29 13:26 ` Noralf Trønnes
2020-02-29 16:02 ` Alan Stern
2020-02-16 17:21 ` [RFC 3/9] usb: gadget: function: Add Multifunction USB Device support Noralf Trønnes
2020-02-16 17:21 ` [RFC 4/9] pinctrl: Add Multifunction USB Device pinctrl driver Noralf Trønnes
2020-02-16 17:21 ` [RFC 5/9] usb: gadget: function: mud: Add gpio support Noralf Trønnes
2020-02-16 17:21 ` [RFC 6/9] regmap: Speed up _regmap_raw_write_impl() for large buffers Noralf Trønnes
2020-02-17 12:15 ` Mark Brown
2020-02-16 17:21 ` [RFC 7/9] drm: Add Multifunction USB Device display driver Noralf Trønnes
2020-02-16 17:21 ` [RFC 8/9] drm/client: Add drm_client_init_from_id() and drm_client_modeset_set() Noralf Trønnes
2020-02-17 9:38 ` Daniel Vetter
2020-02-23 17:43 ` Noralf Trønnes
2020-02-23 20:59 ` Daniel Vetter
2020-02-16 17:21 ` [RFC 9/9] usb: gadget: function: mud: Add display support Noralf Trønnes
2020-02-17 9:40 ` [RFC 0/9] Regmap over USB for Multifunction USB Device (gpio, display, ...) Daniel Vetter
2020-02-17 10:32 ` Neil Armstrong
2020-02-17 14:05 ` Noralf Trønnes
2020-02-18 20:57 ` Andy Shevchenko [this message]
2020-02-18 21:31 ` Noralf Trønnes
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAHp75Vc6=V=cXM0mmh88V6XLmJT6kFnJCS547vgxX0zBG+cTZQ@mail.gmail.com' \
--to=andy.shevchenko@gmail.com \
--cc=balbi@kernel.org \
--cc=broonie@kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=lee.jones@linaro.org \
--cc=linux-usb@vger.kernel.org \
--cc=noralf@tronnes.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).