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From: Doug Anderson <dianders@chromium.org>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Philip Chen <philipchen@chromium.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Robert Foss <robert.foss@linaro.org>,
	dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH 1/2] drm/bridge: parade-ps8640: Use regmap APIs
Date: Thu, 9 Sep 2021 14:14:29 -0700	[thread overview]
Message-ID: <CAD=FV=Uzy5vagh2G4pbqpSgVVjaGoswiH=udBH5RVZ96cNu=eQ@mail.gmail.com> (raw)
In-Reply-To: <CAE-0n51GPe4aWqmbm4htArS716dKhYPPV2KbKtk-d6MsUe8UpA@mail.gmail.com>

Hi,

On Thu, Sep 9, 2021 at 12:09 PM Stephen Boyd <swboyd@chromium.org> wrote:
>
> Quoting Philip Chen (2021-09-09 11:29:19)
> > Hi,
> >
> > On Wed, Sep 8, 2021 at 2:54 PM Stephen Boyd <swboyd@chromium.org> wrote:
> > >
> > > Quoting Philip Chen (2021-09-08 11:18:05)
> > > > diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> > > > index 685e9c38b2db..a16725dbf912 100644
> > > > --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> > > > +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> > > > @@ -64,12 +65,29 @@ struct ps8640 {
> > > >         struct drm_bridge *panel_bridge;
> > > >         struct mipi_dsi_device *dsi;
> > > >         struct i2c_client *page[MAX_DEVS];
> > > > +       struct regmap   *regmap[MAX_DEVS];
> > > >         struct regulator_bulk_data supplies[2];
> > > >         struct gpio_desc *gpio_reset;
> > > >         struct gpio_desc *gpio_powerdown;
> > > >         bool powered;
> > > >  };
> > > >
> > > > +static const struct regmap_range ps8640_volatile_ranges[] = {
> > > > +       { .range_min = 0, .range_max = 0xff },
> > >
> > > Is the plan to fill this out later or is 0xff the max register? If it's
> > > the latter then I think adding the max register to regmap_config is
> > > simpler.
> > It's the former.
> > The real accessible register range is different per page, E.g.:
> > - For page0, the register range is 0x00 - 0xbf.
> > - For page1, the register range is 0x00 - 0xff.
> > - For page2, the register range is 0x80 - 0xff.
>
> Oh does this have register pages? regmap has support for pages where you
> write some indirection register and then access the same i2c address for
> the next page. This looks different though and has a different i2c
> address for each page?

I haven't looked in tons of detail, but I think the right solution
here is a separate regmap config per page.

-Doug

  reply	other threads:[~2021-09-09 21:14 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 18:18 Philip Chen
2021-09-08 18:18 ` [PATCH 2/2] drm/bridge: parade-ps8640: Add support for AUX channel Philip Chen
2021-09-08 22:27   ` Stephen Boyd
2021-09-09 18:15     ` Philip Chen
2021-09-09 19:07       ` Stephen Boyd
2021-09-13 21:35         ` Philip Chen
2021-09-08 21:54 ` [PATCH 1/2] drm/bridge: parade-ps8640: Use regmap APIs Stephen Boyd
2021-09-09 18:29   ` Philip Chen
2021-09-09 19:09     ` Stephen Boyd
2021-09-09 21:14       ` Doug Anderson [this message]
2021-09-09 21:27         ` Stephen Boyd
2021-09-13 21:36           ` Philip Chen

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