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From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: linux-kernel@vger.kernel.org
Cc: "Lee Jones" <lee.jones@linaro.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Alessandro Zummo" <a.zummo@towertech.it>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"NXP Linux Team" <linux-imx@nxp.com>,
	"Sam Ravnborg" <sam@ravnborg.org>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Heiko Stuebner" <heiko.stuebner@theobroma-systems.com>,
	"Stephan Gerhold" <stephan@gerhold.net>,
	"Lubomir Rintel" <lkundrak@v3.sk>,
	"Mark Brown" <broonie@kernel.org>, allen <allen.chen@ite.com.tw>,
	"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	devicetree@vger.kernel.org, linux-pwm@vger.kernel.org,
	linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	"Heiko Stuebner" <heiko@sntech.de>,
	"Josua Mayer" <josua.mayer@jm0.eu>,
	"Andreas Kemnade" <andreas@kemnade.info>
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> (raw)
In-Reply-To: <20200620224222.1312520-1-j.neuschaefer@gmx.net>

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:49.17-42:
  Warning (pwms_property): /example-0/backlight:pwms: cell 2 is not a
  phandle reference
  Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-42:
  Warning (pwms_property): /example-0/backlight:pwms: Could not get
  phandle node for (cell 2)

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
---
 .../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-pwm.yaml

diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
index 596df460f98eb..6562c41c5a9a9 100644
--- 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:
+    $ref: ../pwm/netronix,ntxec-pwm.yaml
+
 required:
   - compatible
   - reg
@@ -53,5 +56,15 @@ examples:
                     interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
                     interrupt-controller;
                     #interrupt-cells = <1>;
+
+                    ec_pwm: pwm {
+                            compatible = "netronix,ntxec-pwm";
+                            #pwm-cells = <1>;
+                    };
             };
     };
+
+    backlight {
+            compatible = "pwm-backlight";
+            pwms = <&ec_pwm 0 50000>;
+    };
diff --git a/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml
new file mode 100644
index 0000000000000..1dc1b1aba081c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$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 Neuschäfer <j.neuschaefer@gmx.net>
+
+description: |
+  See also Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
+
+  The Netronix EC contains PWM functionality, which is usually used to drive
+  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"
--
2.27.0


  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-20 22:42 [RFC PATCH 02/10] dt-bindings: Add vendor prefix for Netronix, Inc Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 03/10] dt-bindings: mfd: Add binding for Netronix's embedded controller Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 04/10] mfd: Add base driver for Netronix " Jonathan Neuschäfer
2020-06-22 10:55   ` Lee Jones
2020-06-28  8:11     ` Jonathan Neuschäfer
2020-06-27  8:17   ` Andreas Kemnade
2020-06-28  8:29     ` Jonathan Neuschäfer
2020-06-20 22:42 ` Jonathan Neuschäfer [this message]
2020-06-21 18:41   ` [RFC PATCH 05/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC Andreas Kemnade
2020-06-20 22:42 ` [RFC PATCH 06/10] pwm: ntxec: Add driver " Jonathan Neuschäfer
2020-06-22  8:18   ` Uwe Kleine-König
2020-07-03 16:15     ` Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 07/10] dt-bindings: rtc: Add bindings for Netronix embedded controller RTC Jonathan Neuschäfer
2020-06-21  0:02   ` Alexandre Belloni
2020-06-26 21:55     ` Andreas Kemnade
2020-07-03 17:04       ` Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 08/10] rtc: New driver for RTC in Netronix embedded controller Jonathan Neuschäfer
2020-06-21  0:11   ` Alexandre Belloni
2020-07-04 19:23     ` Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 09/10] MAINTAINERS: Add entry for " Jonathan Neuschäfer
2020-06-20 22:42 ` [RFC PATCH 10/10] ARM: dts: imx50-kobo-aura: Add " Jonathan Neuschäfer
2020-06-20 22:46 ` [RFC PATCH 02/10] dt-bindings: Add vendor prefix for Netronix, Inc Jonathan Neuschäfer

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