linux-kernel - [RFC PATCH 10/10] ARM: dts: imx50-kobo-aura: Add Netronix embedded controller

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Message-Id: <20200620224222.1312520-9-j.neuschaefer@gmx.net>
Date:   Sun, 21 Jun 2020 00:42:21 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-kernel@...r.kernel.org
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        Josua Mayer <josua.mayer@....eu>,
        Andreas Kemnade <andreas@...nade.info>
Subject: [RFC PATCH 10/10] ARM: dts: imx50-kobo-aura: Add Netronix embedded controller

Enable the Netronix EC on the Kobo Aura ebook reader.

Several features are still missing:
 - Frontlight/backlight. The vendor kernel drives the frontlight LED
   using the PWM output of the EC and an additional boost pin that
   increases the brightness.
 - Battery monitoring
 - Interrupts for RTC alarm and low-battery events

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
 arch/arm/boot/dts/imx50-kobo-aura.dts | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx50-kobo-aura.dts b/arch/arm/boot/dts/imx50-kobo-aura.dts
index a0eaf869b9135..003a7d894902c 100644
--- a/arch/arm/boot/dts/imx50-kobo-aura.dts
+++ b/arch/arm/boot/dts/imx50-kobo-aura.dts
@@ -6,6 +6,7 @@
 /dts-v1/;
 #include "imx50.dtsi"
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>

 / {
 	model = "Kobo Aura (N514)";
@@ -135,10 +136,34 @@ &i2c3 {
 	pinctrl-0 = <&pinctrl_i2c3>;
 	status = "okay";

-	/* TODO: embedded controller at 0x43 */
+	embedded-controller@43 {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_ec>;
+		compatible = "netronix,ntxec";
+		reg = <0x43>;
+		system-power-controller;
+		interrupts-extended = <&gpio4 11 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		ec_pwm: pwm {
+			compatible = "netronix,ntxec-pwm";
+			#pwm-cells = <2>;
+		};
+
+		rtc {
+			compatible = "netronix,ntxec-rtc";
+		};
+	};
 };

 &iomuxc {
+	pinctrl_ec: ec {
+		fsl,pins = <
+			MX50_PAD_CSPI_SS0__GPIO4_11		0x0	/* INT */
+		>;
+	};
+
 	pinctrl_gpiokeys: gpiokeys {
 		fsl,pins = <
 			MX50_PAD_CSPI_MISO__GPIO4_10		0x0
--
2.27.0