linux-kernel - [PATCH v7 01/10] dt-bindings: battery: add new battery parameters

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Message-ID: <8827238b51029886dea56ce3141b216361a3f299.1585656143.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Tue, 31 Mar 2020 15:21:50 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     matti.vaittinen@...rohmeurope.com, mazziesaccount@...il.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mikko Mutanen <mikko.mutanen@...rohmeurope.com>,
        Markus Laine <markus.laine@...rohmeurope.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>, Borislav Petkov <bp@...e.de>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Changbin Du <changbin.du@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Gow <davidgow@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Gary Hook <Gary.Hook@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Mikhail Zaslonko <zaslonko@...ux.ibm.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Tal Gilboa <talgi@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Vladimir Oltean <olteanv@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: [PATCH v7 01/10] dt-bindings: battery: add new battery parameters

Add:

 - trickle-charge-current-microamp:

Some chargers have 3 charging stages. First one when battery is almost
empty is often called as trickle-charge. Last state when battery has been
"woken up" is usually called as fast-charge. In addition to this some
chargers have a 'middle state' which ROHM BD99954 data-sheet describes as
pre-charge. Some batteries can benefit from this 3-phase charging
[citation needed].

Introduce trickle-charge-current-microamp so that batteries can give
charging current limit for all three states.

 - precharge-upper-limit-microvolt:

When battery voltage has reached certain limit we change from
trickle-charge to next charging state (pre-charge for BD99954). Allow
battery to specify this limit.

 - re-charge-voltage-microvolt:

Allow giving a battery specific voltage limit for chargers which can
automatically re-start charging when battery has discharghed down to
this limit.

- over-voltage-threshold-microvolt

Allow specifying voltage threshold after which the battery is assumed to
be faulty.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---

No changes from v6

 Documentation/devicetree/bindings/power/supply/battery.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt
index 3049cf88bdcf..5e29595edd74 100644
--- a/Documentation/devicetree/bindings/power/supply/battery.txt
+++ b/Documentation/devicetree/bindings/power/supply/battery.txt
@@ -11,15 +11,21 @@ different type. This prevents unpredictable, potentially harmful,
 behavior should a replacement that changes the battery type occur
 without a corresponding update to the dtb.
 
+Please note that not all charger drivers respect all of the properties.
+
 Required Properties:
  - compatible: Must be "simple-battery"
 
 Optional Properties:
+ - over-voltage-threshold-microvolt: battery over-voltage limit
+ - re-charge-voltage-microvolt: limit to automatically start charging again
  - voltage-min-design-microvolt: drained battery voltage
  - voltage-max-design-microvolt: fully charged battery voltage
  - energy-full-design-microwatt-hours: battery design energy
  - charge-full-design-microamp-hours: battery design capacity
+ - trickle-charge-current-microamp: current for trickle-charge phase
  - precharge-current-microamp: current for pre-charge phase
+ - precharge-upper-limit-microvolt: limit when to change to constant charging
  - charge-term-current-microamp: current for charge termination phase
  - constant-charge-current-max-microamp: maximum constant input current
  - constant-charge-voltage-max-microvolt: maximum constant input voltage
-- 
2.21.0


-- 
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 ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]