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SubjectRe: [PATCH] w1: omap-hdq: Simplify driver with PM runtime autosuspend
On Sun, 15 Dec 2019 09:38:17 -0800
Tony Lindgren <tony@atomide.com> wrote:

> We've had generic code handling module sysconfig and OCP reset registers
> for omap variants for many years now and all the drivers really needs to
> do is just call runtime PM functions.
>
> Looks like the omap-hdq driver got only partially updated over the years
> to use runtime PM, and still has lots of custom PM code left.
>
> We can replace all the custom code for sysconfig, OCP reset, and PM with
> just a few lines of runtime PM autosuspend code.
>
> Note that the earlier driver specific usage count limit of four seems
> completely artificial and should not be an issue in normal use.
>
> Cc: Adam Ford <aford173@gmail.com>
> Cc: Andrew F. Davis <afd@ti.com>
> Cc: Andreas Kemnade <andreas@kemnade.info>
> Cc: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Vignesh R <vigneshr@ti.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> ---
>
>
> Can you guys please review and and test on gta04 and torpedo?
>
I tried this after booting with init=/bin/bash and mounting kernel
filesystems (no off mode enabled):
root@(none):/# echo on >/sys/bus/platform/devices/480b2000.1w/power/control
root@(none):/# modprobe omap_hdq
[ 49.590820] Driver for 1-wire Dallas network protocol.
[ 49.598327] omap_hdq 480b2000.1w: OMAP HDQ Hardware Rev 0.5. Driver in Interrupt mode
root@(none):/# [ 49.624572] w1_master_driver w1_bus_master1: Attaching one wire slave 01.000000000000 crc 3d
[ 49.660980] power_supply bq27000-battery: power_supply_get_battery_info currently only supports devicetree

root@(none):/# time cat /sys/class/power_supply/bq27000-battery/voltage_now
0

real 0m2.561s
user 0m0.008s
sys 0m0.002s
root@(none):/# time cat /sys/class/power_supply/bq27000-battery/voltage_now
0

real 0m12.601s
user 0m0.010s
sys 0m0.002s
root@(none):/# time cat /sys/class/power_supply/bq27000-battery/voltage_now
0

real 0m12.601s
user 0m0.010s
sys 0m0.002s
root@(none):/#

No data could be read but some detection work seem to be done.
Of course, I also tried without that forced power on.

I hope I can find more time to analyze.
Looks like a nice cleanup but needs some work.

Regards,
Andreas

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