linux-kernel - [PATCH 10/15] ARM: dts: am335x: Guardian: Update backlight parameter

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Date:   Fri, 25 Mar 2022 10:06:08 +0000
From:   <Gireesh.Hiremath@...bosch.com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <robh+dt@...nel.org>,
        <tony@...mide.com>, <bcousson@...libre.com>
CC:     <sjoerd.simons@...labora.co.uk>, <VinayKumar.Shettar@...bosch.com>,
        <Govindaraji.Sivanantham@...bosch.com>,
        <anaclaudia.dias@...bosch.com>, <Gireesh.Hiremath@...bosch.com>
Subject: [PATCH 10/15] ARM: dts: am335x: Guardian: Update backlight parameter

From: Gireesh Hiremath <Gireesh.Hiremath@...bosch.com>

 * Update default brightness and dimming frequency
 * Enable current sink, while initialization

Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@...bosch.com>
---
 arch/arm/boot/dts/am335x-guardian.dts | 31 +++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/am335x-guardian.dts b/arch/arm/boot/dts/am335x-guardian.dts
index 75ac8686091a..fab844815065 100644
--- a/arch/arm/boot/dts/am335x-guardian.dts
+++ b/arch/arm/boot/dts/am335x-guardian.dts
@@ -291,14 +291,34 @@
 #include "tps65217.dtsi"
 
 &tps {
+  /*
+   * Configure pmic to enter OFF-state instead of SLEEP-state ("RTC-only
+   * mode") at poweroff.  Most BeagleBone versions do not support RTC-only
+   * mode and risk hardware damage if this mode is entered.
+   *
+   * For details, see linux-omap mailing list May 2015 thread
+   *  [PATCH] ARM: dts: am335x-bone* enable pmic-shutdown-controller
+   * In particular, messages:
+   *  http://www.spinics.net/lists/linux-omap/msg118585.html
+   *  http://www.spinics.net/lists/linux-omap/msg118615.html
+   *
+   * You can override this later with
+   *  &tps {  /delete-property/ ti,pmic-shutdown-controller;  }
+   * if you want to use RTC-only mode and made sure you are not affected
+   * by the hardware problems. (Tip: double-check by performing a current
+   * measurement after shutdown: it should be less than 1 mA.)
+   */
 	ti,pmic-shutdown-controller;
 	interrupt-parent = <&intc>;
 	interrupts = <7>; /* NMI */
 
 	backlight {
 		isel = <1>;  /* 1 - ISET1, 2 ISET2 */
-		fdim = <100>; /* TPS65217_BL_FDIM_100HZ */
-		default-brightness = <100>;
+		fdim = <500>; /* TPS65217_BL_FDIM_500HZ */
+		default-brightness = <50>;
+		/* 1(on) - enable current sink, while initialization */
+		/* 0(off) - disable current sink, while initialization */
+		isink-en = <1>;
 	};
 
 	regulators {
@@ -408,6 +428,13 @@
 		>;
 	};
 
+	led_bl_pins: gpio_led_bl_pins {
+		pinctrl-single,pins = <
+			/* P9_14, gpmc_a[2].GPIO1[18] (backlight control) */
+			AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE7)
+		>;
+	};
+
 	lcd_disen_pins: pinmux_lcd_disen_pins {
 		pinctrl-single,pins = <
 			/* P9_27, mcasp0_fsr.gpio3[19] (lcd_disen) */
-- 
2.20.1