linux-kernel - [PATCH v9 4/8] dt-bindings: pwm: Support new PWM_USAGE

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Date:   Thu, 15 Apr 2021 14:14:51 +0200
From:   Clemens Gruber <clemens.gruber@...ruber.com>
To:     linux-pwm@...r.kernel.org
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sven Van Asbroeck <TheSven73@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Clemens Gruber <clemens.gruber@...ruber.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH v9 4/8] dt-bindings: pwm: Support new PWM_USAGE_POWER flag

Add the flag and corresponding documentation for PWM_USAGE_POWER.

Cc: Rob Herring <robh+dt@...nel.org>
Signed-off-by: Clemens Gruber <clemens.gruber@...ruber.com>
---
 Documentation/devicetree/bindings/pwm/pwm.txt | 3 +++
 include/dt-bindings/pwm/pwm.h                 | 1 +
 2 files changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt
index 084886bd721e..fe3a28f887c0 100644
--- a/Documentation/devicetree/bindings/pwm/pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/pwm.txt
@@ -46,6 +46,9 @@ period in nanoseconds.
 Optionally, the pwm-specifier can encode a number of flags (defined in
 <dt-bindings/pwm/pwm.h>) in a third cell:
 - PWM_POLARITY_INVERTED: invert the PWM signal polarity
+- PWM_USAGE_POWER: Only care about the power output of the signal. This
+  allows drivers (if supported) to optimize the signals, for example to
+  improve EMI and reduce current spikes.
 
 Example with optional PWM specifier for inverse polarity
 
diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h
index ab9a077e3c7d..0d5a8f0c0035 100644
--- a/include/dt-bindings/pwm/pwm.h
+++ b/include/dt-bindings/pwm/pwm.h
@@ -11,5 +11,6 @@
 #define _DT_BINDINGS_PWM_PWM_H
 
 #define PWM_POLARITY_INVERTED			(1 << 0)
+#define PWM_USAGE_POWER				(1 << 1)
 
 #endif
-- 
2.31.1