From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= Subject: [RFC PATCH 05/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC Date: Sun, 21 Jun 2020 00:42:16 +0200 Message-ID: <20200620224222.1312520-4-j.neuschaefer@gmx.net> References: <20200620224222.1312520-1-j.neuschaefer@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20200620224222.1312520-1-j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Lee Jones , Rob Herring , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Alessandro Zummo , Alexandre Belloni , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Sam Ravnborg , Linus Walleij , Heiko Stuebner , Stephan Gerhold , Lubomir Rintel , Mark Brown List-Id: linux-pwm@vger.kernel.org The Netronix embedded controller as found in Kobo Aura and Tolino Shine supports one PWM channel, which is used to control the frontlight brightness on these devices. Known problems: - `make dt_binding_check` shows the following warnings: Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-4= 2: Warning (pwms_property): /example-0/backlight:pwms: cell 2 is not a phandle reference Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-4= 2: Warning (pwms_property): /example-0/backlight:pwms: Could not get phandle node for (cell 2) Signed-off-by: Jonathan Neusch=C3=A4fer =2D-- .../bindings/mfd/netronix,ntxec.yaml | 13 ++++++++ .../bindings/pwm/netronix,ntxec-pwm.yaml | 33 +++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/netronix,ntxec-p= wm.yaml diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/D= ocumentation/devicetree/bindings/mfd/netronix,ntxec.yaml index 596df460f98eb..6562c41c5a9a9 100644 =2D-- a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml +++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml @@ -31,6 +31,9 @@ properties: description: The EC can signal interrupts via a GPIO line + pwm: + $ref: ../pwm/netronix,ntxec-pwm.yaml + required: - compatible - reg @@ -53,5 +56,15 @@ examples: interrupts =3D <11 IRQ_TYPE_EDGE_FALLING>; interrupt-controller; #interrupt-cells =3D <1>; + + ec_pwm: pwm { + compatible =3D "netronix,ntxec-pwm"; + #pwm-cells =3D <1>; + }; }; }; + + backlight { + compatible =3D "pwm-backlight"; + pwms =3D <&ec_pwm 0 50000>; + }; diff --git a/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml= b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml new file mode 100644 index 0000000000000..1dc1b1aba081c =2D-- /dev/null +++ b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/netronix,ntxec-pwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: PWM functionality in Netronix embedded controller + +maintainers: + - Jonathan Neusch=C3=A4fer + +description: | + See also Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml + + The Netronix EC contains PWM functionality, which is usually used to dr= ive + the backlight LED. + + The following PWM channels are supported: + - 0: The PWM channel controlled by registers 0xa1-0xa7 + +allOf: + - $ref: pwm.yaml# + +properties: + compatible: + const: netronix,ntxec-pwm + + "#pwm-cells": + const: 1 + +required: + - compatible + - "#pwm-cells" =2D- 2.27.0