From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Christophe Roullier <christophe.roullier@st.com>
Cc: kernel@pengutronix.de, Arnaud Pouliquen <arnaud.pouliquen@st.com>,
Ahmad Fatoum <a.fatoum@pengutronix.de>,
Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: arm: stm32: add simple-mfd compatible for tamp node
Date: Wed, 21 Oct 2020 12:28:55 +0200 [thread overview]
Message-ID: <20201021102855.18026-1-a.fatoum@pengutronix.de> (raw)
The stm32mp1 TAMP (Tamper and backup registers) does tamper detection
and features 32 backup registers that, being in the RTC domain, may
survive even with Vdd switched off.
This makes it suitable for use to communicate a reboot mode from OS
to bootloader via the syscon-reboot-mode binding. Add a "simple-mfd"
to support probing such a child node. The actual reboot mode
node could then be defined in a board.dts or fixed up by the bootloader.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 available here:
https://lore.kernel.org/linux-arm-kernel/20200916142216.25142-1-a.fatoum@pengutronix.de/
v1 -> v2:
- new patch, rebased on top of
https://lore.kernel.org/r/20201014125441.2457-1-arnaud.pouliquen@st.com
---
.../devicetree/bindings/arm/stm32/st,stm32-syscon.yaml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
index 6634b3e0853e..4684017a42e4 100644
--- a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
+++ b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
@@ -19,8 +19,11 @@ properties:
- st,stm32mp151-pwr-mcu
- st,stm32-syscfg
- st,stm32-power-config
- - st,stm32-tamp
- const: syscon
+ - items:
+ - const: st,stm32-tamp
+ - const: syscon
+ - const: simple-mfd
reg:
maxItems: 1
--
2.28.0
next reply other threads:[~2020-10-21 10:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 10:28 Ahmad Fatoum [this message]
2020-10-21 10:28 ` [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon Ahmad Fatoum
2020-11-17 11:18 ` Alexandre Torgue
2020-10-26 14:36 ` [PATCH v2 1/2] dt-bindings: arm: stm32: add simple-mfd compatible for tamp node Rob Herring
2020-10-26 21:30 ` Ahmad Fatoum
2020-10-27 12:15 ` Rob Herring
2020-11-10 10:27 ` Ahmad Fatoum
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=20201021102855.18026-1-a.fatoum@pengutronix.de \
--to=a.fatoum@pengutronix.de \
--cc=alexandre.torgue@st.com \
--cc=arnaud.pouliquen@st.com \
--cc=christophe.roullier@st.com \
--cc=devicetree@vger.kernel.org \
--cc=kernel@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=mcoquelin.stm32@gmail.com \
--cc=robh+dt@kernel.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).