From: Mark Brown <broonie@kernel.org>
To: "H. Nikolaus Schaller" <hns@goldelico.com>
Cc: Paul Cercueil <paul@crapouillou.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Kees Cook <keescook@chromium.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Neil Armstrong <narmstrong@baylibre.com>,
Robert Foss <robert.foss@linaro.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Harry Wentland <harry.wentland@amd.com>,
Sam Ravnborg <sam@ravnborg.org>,
Maxime Ripard <maxime@cerno.tech>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Liam Girdwood <lgirdwood@gmail.com>,
Paul Boddie <paul@boddie.org.uk>,
devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
linux-kernel@vger.kernel.org, letux-kernel@openphoenux.org,
Jonas Karlman <jonas@kwiboo.se>,
dri-devel@lists.freedesktop.org,
Ezequiel Garcia <ezequiel@collabora.com>
Subject: Re: [PATCH v10 4/8] drm/ingenic: Add dw-hdmi driver for jz4780
Date: Wed, 1 Dec 2021 17:02:38 +0000 [thread overview]
Message-ID: <YaeqrhJg4664Tr/y@sirena.org.uk> (raw)
In-Reply-To: <3174DA41-EB38-4C30-8752-0D9C894C74A7@goldelico.com>
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On Wed, Dec 01, 2021 at 05:53:03PM +0100, H. Nikolaus Schaller wrote:
> > Am 01.12.2021 um 16:10 schrieb Mark Brown <broonie@kernel.org>:
> > Again, if the supply can be physically absent that is a sensible use
> > case but that means completely absent, not just not software
> > controllable. We can represent fixed voltage regulators just fine.
> The question may be how we can know for a more generic driver that there is always a regulator.
> In the present case we know the schematics but it is just one example.
The datasheet will generally explicitly call out if a supply can be
disconnected. In general it is astonishingly rare for this to be the
case, supporting that case will tend to make designing the chip harder
(you have to cope with what happens where the power domains meet) and
results in whatever functionality the supplies power not working. If
not otherwise specified it's safer to assume that the supplies must be
connected.
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WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org>
To: "H. Nikolaus Schaller" <hns@goldelico.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Paul Boddie <paul@boddie.org.uk>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Neil Armstrong <narmstrong@baylibre.com>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org, linux-mips@vger.kernel.org,
Paul Cercueil <paul@crapouillou.net>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Sam Ravnborg <sam@ravnborg.org>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
devicetree@vger.kernel.org, Kees Cook <keescook@chromium.org>,
Jonas Karlman <jonas@kwiboo.se>, Rob Herring <robh+dt@kernel.org>,
Maxime Ripard <maxime@cerno.tech>,
letux-kernel@openphoenux.org,
Ezequiel Garcia <ezequiel@collabora.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Liam Girdwood <lgirdwood@gmail.com>,
Robert Foss <robert.foss@linaro.org>,
linux-kernel@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>
Subject: Re: [PATCH v10 4/8] drm/ingenic: Add dw-hdmi driver for jz4780
Date: Wed, 1 Dec 2021 17:02:38 +0000 [thread overview]
Message-ID: <YaeqrhJg4664Tr/y@sirena.org.uk> (raw)
In-Reply-To: <3174DA41-EB38-4C30-8752-0D9C894C74A7@goldelico.com>
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On Wed, Dec 01, 2021 at 05:53:03PM +0100, H. Nikolaus Schaller wrote:
> > Am 01.12.2021 um 16:10 schrieb Mark Brown <broonie@kernel.org>:
> > Again, if the supply can be physically absent that is a sensible use
> > case but that means completely absent, not just not software
> > controllable. We can represent fixed voltage regulators just fine.
> The question may be how we can know for a more generic driver that there is always a regulator.
> In the present case we know the schematics but it is just one example.
The datasheet will generally explicitly call out if a supply can be
disconnected. In general it is astonishingly rare for this to be the
case, supporting that case will tend to make designing the chip harder
(you have to cope with what happens where the power domains meet) and
results in whatever functionality the supplies power not working. If
not otherwise specified it's safer to assume that the supplies must be
connected.
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next prev parent reply other threads:[~2021-12-01 17:02 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 21:26 [PATCH v10 0/8] MIPS: JZ4780 and CI20 HDMI H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 1/8] drm/ingenic: prepare ingenic drm for later addition of JZ4780 H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 2/8] drm/ingenic: Add support for JZ4780 and HDMI output H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 3/8] dt-bindings: display: Add ingenic,jz4780-dw-hdmi DT Schema H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 3/8] dt-bindings: display: Add ingenic, jz4780-dw-hdmi " H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 4/8] drm/ingenic: Add dw-hdmi driver for jz4780 H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-12-01 13:02 ` Paul Cercueil
2021-12-01 13:02 ` Paul Cercueil
2021-12-01 13:18 ` H. Nikolaus Schaller
2021-12-01 13:18 ` H. Nikolaus Schaller
2021-12-01 13:39 ` Mark Brown
2021-12-01 13:39 ` Mark Brown
2021-12-01 13:51 ` H. Nikolaus Schaller
2021-12-01 13:51 ` H. Nikolaus Schaller
2021-12-01 14:03 ` Paul Cercueil
2021-12-01 14:03 ` Paul Cercueil
2021-12-01 14:33 ` H. Nikolaus Schaller
2021-12-01 14:33 ` H. Nikolaus Schaller
2021-12-01 15:10 ` Mark Brown
2021-12-01 15:10 ` Mark Brown
2021-12-01 16:53 ` H. Nikolaus Schaller
2021-12-01 16:53 ` H. Nikolaus Schaller
2021-12-01 17:02 ` Mark Brown [this message]
2021-12-01 17:02 ` Mark Brown
2021-11-30 21:26 ` [PATCH v10 5/8] MIPS: DTS: jz4780: Account for Synopsys HDMI driver and LCD controllers H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 6/8] MIPS: DTS: CI20: Add DT nodes for HDMI setup H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 7/8] MIPS: defconfig: CI20: configure for DRM_DW_HDMI_JZ4780 H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
2021-11-30 21:26 ` [PATCH v10 8/8] [RFC] MIPS: DTS: Ingenic: adjust register size to available registers H. Nikolaus Schaller
2021-11-30 21:26 ` H. Nikolaus Schaller
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