linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
To: mazziesaccount@gmail.com, matti.vaittinen@fi.rohmeurope.com
Cc: "Lee Jones" <lee.jones@linaro.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Liam Girdwood" <lgirdwood@gmail.com>,
	"Mark Brown" <broonie@kernel.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	heikki.haikola@fi.rohmeurope.com,
	mikko.mutanen@fi.rohmeurope.com,
	"Robin Gong ‎" <yibin.gong@nxp.com>,
	"Elven Wang ‎" <elven.wang@nxp.com>,
	"Anson Huang ‎" <anson.huang@nxp.com>
Subject: [RFC PATCH v1 1/3] devicetree: bindings: bd718x7: document HW state related ROHM specific properties
Date: Tue, 12 Feb 2019 16:17:03 +0200	[thread overview]
Message-ID: <eb0768eb589acdc4b1be3f5dd042e7d8ead26797.1549980347.git.matti.vaittinen@fi.rohmeurope.com> (raw)
In-Reply-To: <cover.1549980347.git.matti.vaittinen@fi.rohmeurope.com>

Add ROHM BD71837 / BD71847 specific device tree bindings for
controlling the PMIC shutdown/reset states and voltages for
different HW states. The PMIC was designed to be used with NXP
i.MX8 SoC and it supports SNVS low power state which seems to
be typical for NXP i.MX SoCs. However, when SNVS is used we must
not allow SW to control enabling/disabling those regulators which
are crucial for system to boot as there is a HW limitation which
causes SW controlled regulators to be kept shut down after SNVS
reset.

Allow setting the SNVS to be used as reset target state and allow
marking those regulators which are critical for boot.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 .../devicetree/bindings/mfd/rohm,bd71837-pmic.txt  | 17 ++++++++++
 .../bindings/regulator/rohm,bd71837-regulator.txt  | 36 ++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.txt b/Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.txt
index a4b056761eaa..2aff8287fdd8 100644
--- a/Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.txt
+++ b/Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.txt
@@ -23,6 +23,23 @@ Required properties:
 
 Optional properties:
 - clock-output-names	: Should contain name for output clock.
+- rohm,reset-snvs-powered : Transfer BD718x7 to SNVS state at reset.
+
+The BD718x7 supports two different HW states as reset target states. States
+are called as SNVS and READY. At the SNVS state all other logic and external
+devices apart from the SNVS power domain are shut off. Please refer to NXP
+i.MX8 documentation for further information regarding SNVS state. When a
+reset is done via SNVS state the PMIC OTP data is not reload.
+
+At READY state all the PMIC power outputs go down and OTP is reload. There
+is a HW quirk in BD718x7 which causes power outputs which have been under
+SW control to stay down when reset has switched power state to SNVS. If
+reset is done via READY state the power outputs will be set to HW control
+by OTP loading. Thus the reset target state is set to READY by default. If
+SNVS state is used the boot crucial regulators should have
+"rohm,regulator-crucial-for-boot" property set in regulator node. Please
+see the ./regulator/rohm,bd71837-regulator.txt for details of regulator
+bindings.
 
 Example:
 
diff --git a/Documentation/devicetree/bindings/regulator/rohm,bd71837-regulator.txt b/Documentation/devicetree/bindings/regulator/rohm,bd71837-regulator.txt
index 4b98ca26e61a..8ff692891dea 100644
--- a/Documentation/devicetree/bindings/regulator/rohm,bd71837-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/rohm,bd71837-regulator.txt
@@ -27,8 +27,44 @@ BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6
 LDO1, LDO2, LDO3, LDO4, LDO5, LDO6
 
 Optional properties:
+- rohm,regulator-crucial-for-boot : Any regulators which are required to stay
+				    enabled for system to boot must be excluded
+				    from SW control by this property if SNVS
+				    state is used as reset target. Please see
+				    the ../mfd/rohm,bd71837-pmic.txt for more
+				    details.
+- rohm,dvs-run-voltage		: PMIC default "RUN" state voltage in uV.
+				  See below table for bucks which support this.
+- rohm,dvs-idle-voltage		: PMIC default "IDLE" state voltage in uV.
+				  See below table for bucks which support this.
+- rohm,dvs-suspend-voltage	: PMIC default "SUSPEND" state voltage in uV.
+				  See below table for bucks which support this.
 - Any optional property defined in bindings/regulator/regulator.txt
 
+Supported default DVS states:
+
+BD71837:
+buck	| dvs-run-voltage	| dvs-idle-voltage	| dvs-suspend-voltage
+-----------------------------------------------------------------------------
+1	| supported		| supported		| supported
+----------------------------------------------------------------------------
+2	| supported		| supported		| not supported
+----------------------------------------------------------------------------
+3	| supported		| not supported		| not supported
+----------------------------------------------------------------------------
+4	| supported		| not supported		| not supported
+----------------------------------------------------------------------------
+rest	| not supported		| not supported		| not supported
+
+BD71847:
+buck	| dvs-run-voltage	| dvs-idle-voltage	| dvs-suspend-voltage
+-----------------------------------------------------------------------------
+1	| supported		| supported		| supported
+----------------------------------------------------------------------------
+2	| supported		| supported		| not supported
+----------------------------------------------------------------------------
+rest	| not supported		| not supported		| not supported
+
 Example:
 regulators {
 	buck1: BUCK1 {
-- 
2.14.3


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~

  reply	other threads:[~2019-02-12 14:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-12 14:16 [RFC PATCH v1 0/3] bd718x7: Support SNVS low power state Matti Vaittinen
2019-02-12 14:17 ` Matti Vaittinen [this message]
2019-02-12 14:18 ` [RFC PATCH v1 2/3] regulator: add regulator_desc_list_voltage_linear_range Matti Vaittinen
2019-02-12 15:34   ` Mark Brown
2019-02-12 14:19 ` [RFC PATCH v1 3/3] regulator: bd718x7: Support SNVS low power state Matti Vaittinen
2019-02-12 16:08   ` Mark Brown
2019-02-13  7:38     ` Matti Vaittinen
2019-02-13  8:33       ` Matti Vaittinen

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=eb0768eb589acdc4b1be3f5dd042e7d8ead26797.1549980347.git.matti.vaittinen@fi.rohmeurope.com \
    --to=matti.vaittinen@fi.rohmeurope.com \
    --cc=anson.huang@nxp.com \
    --cc=broonie@kernel.org \
    --cc=devicetree@vger.kernel.org \
    --cc=elven.wang@nxp.com \
    --cc=heikki.haikola@fi.rohmeurope.com \
    --cc=lee.jones@linaro.org \
    --cc=lgirdwood@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mazziesaccount@gmail.com \
    --cc=mikko.mutanen@fi.rohmeurope.com \
    --cc=robh+dt@kernel.org \
    --cc=yibin.gong@nxp.com \
    /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).