linux-kernel - [PATCH v3] dt-bindings: power: supply: bq24735: reverse the polarity of ac-detect

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Date:   Thu, 15 Dec 2016 13:21:19 +0100
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>, Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH v3] dt-bindings: power: supply: bq24735: reverse the polarity of ac-detect

The ACOK pin on the bq24735 is active-high, of course meaning that when
AC is OK the pin is high. However, all Tegra dts files have incorrectly
specified active-high even though the signal is inverted on the Tegra
boards. This has worked since the Linux driver has also inverted the
meaning of the GPIO. Fix this situation by simply specifying in the
bindings what everybody else agrees on; that the ti,ac-detect-gpios is
active on AC adapter absence.

Signed-off-by: Peter Rosin <peda@...ntia.se>
---

Hi!

This patch is the result of this discussion:
http://marc.info/?t=148152531800002

I don't like how it changes the one thing that is seems correct, but
what to do?

Cheers,
Peter

 Documentation/devicetree/bindings/power/supply/ti,bq24735.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/power/supply/ti,bq24735.txt b/Documentation/devicetree/bindings/power/supply/ti,bq24735.txt
index 3bf55757ceec..43d56c49455b 100644
--- a/Documentation/devicetree/bindings/power/supply/ti,bq24735.txt
+++ b/Documentation/devicetree/bindings/power/supply/ti,bq24735.txt
@@ -8,8 +8,9 @@ Optional properties :
  - interrupts : Specify the interrupt to be used to trigger when the AC
    adapter is either plugged in or removed.
  - ti,ac-detect-gpios : This GPIO is optionally used to read the AC adapter
-   presence. This is a Host GPIO that is configured as an input and
-   connected to the bq24735.
+   status. This is a Host GPIO that is configured as an input and
+   connected to the bq24735, typically the ACOK pin (note: the GPIO should
+   be active on AC adapter absence).
  - ti,charge-current : Used to control and set the charging current. This value
    must be between 128mA and 8.128A with a 64mA step resolution. The POR value
    is 0x0000h. This number is in mA (e.g. 8192), see spec for more information
-- 
2.1.4