[PATCH] ARM: dts: omap4-droid4: Enable hdq for droid4 ds250x 1-wire battery nvmem

[PATCH] ARM: dts: omap4-droid4: Enable hdq for droid4 ds250x 1-wire battery nvmem

[Tony Lindgren]

With "[PATCHv3] w1: omap-hdq: Simplify driver with PM runtime autosuspend"
we can read the droid4 battery information over 1-wire with this patch
with something like:

# modprobe omap_hdq
# hd /sys/bus/w1/devices/89-*/89-*/nvmem
...

Unfortunately the format of the battery data seems to be Motorola specific
and is currently unusable for battery charger unless somebody figures out
what it means.

Note that currently keeping omap_hdq module loaded will cause extra power
consumption as it seems to scan devices periodically.

Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/boot/dts/motorola-mapphone-common.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/motorola-mapphone-common.dtsi b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
--- a/arch/arm/boot/dts/motorola-mapphone-common.dtsi
+++ b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
@@ -259,6 +259,13 @@
 	};
 };
 
+/* Battery NVRAM on 1-wire handled by w1_ds250x driver */
+&hdqw1w {
+	pinctrl-0 = <&hdq_pins>;
+	pinctrl-names = "default";
+	ti,mode = "1w";
+};
+
 &i2c1 {
 	tmp105@48 {
 		compatible = "ti,tmp105";
@@ -449,6 +456,13 @@
 		>;
 	};
 
+	hdq_pins: pinmux_hdq_pins {
+		pinctrl-single,pins = <
+		/* 0x4a100120 hdq_sio.hdq_sio aa27 */
+		OMAP4_IOPAD(0x120, PIN_INPUT | MUX_MODE0)
+		>;
+	};
+
 	/* hdmi_cec.hdmi_cec, hdmi_scl.hdmi_scl, hdmi_sda.hdmi_sda */
 	dss_hdmi_pins: pinmux_dss_hdmi_pins {
 		pinctrl-single,pins = <
-- 
2.24.1

Re: [PATCH] ARM: dts: omap4-droid4: Enable hdq for droid4 ds250x 1-wire battery nvmem

[Pavel Machek]

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On Sun 2020-01-19 11:56:59, Tony Lindgren wrote:
> With "[PATCHv3] w1: omap-hdq: Simplify driver with PM runtime autosuspend"
> we can read the droid4 battery information over 1-wire with this patch
> with something like:
> 
> # modprobe omap_hdq
> # hd /sys/bus/w1/devices/89-*/89-*/nvmem
> ...
> 
> Unfortunately the format of the battery data seems to be Motorola specific
> and is currently unusable for battery charger unless somebody figures out
> what it means.
> 
> Note that currently keeping omap_hdq module loaded will cause extra power
> consumption as it seems to scan devices periodically.
> 
> Cc: Merlijn Wajer <merlijn-tF0PIh4TN3odnm+yROfE0A@public.gmane.org>

Acked-by: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>

Not for stable.
								Pavel
								
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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