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Date:   Mon, 23 Jan 2017 15:49:12 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Pavel Machek <pavel@....cz>
Cc:     pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        fabio.estevam@....com, rui.zhang@...el.com
Subject: Re: v4.10-rc4 to v4.10-rc5: battery regression on Nokia N900

On Tue, Jan 24, 2017 at 12:26:54AM +0100, Pavel Machek wrote:
> Hi!
> 
> > > >I'll try to revert it on the top of v4.10-rc5 now... and yes, it fixes
> > > >the issue.
> > > >
> > > >Any idea what went wrong and how to fix that?
> > > >
> > > >Anyway as we are at -rc5 and this is warning fix that caused a
> > > >regression on different hardware... it should be reverted.
> > > >
> > > Agreed.
> > > 
> > > What exactly does "stopped working" mean ? That might help understanding
> > > what went wrong.
> > 
> > /sys files related to battery no longer appear. I beieve this has
> > something to do with it:
> > 
> > [    2.374877] of_get_named_gpiod_flags: parsed 'reset-gpios' property
> > of node '/ocp@...00000/spi@...98000/tsc2005@0[0]' - status (0)
> > [    2.375946] input: TSC2005 touchscreen as
> > /devices/platform/68000000.ocp/48098000.spi/spi_master/spi1/spi1.0/input/input5
> > [    2.392120] rx51-battery: probe of n900-battery failed with error
> > -22
> 
> Mystery solved:
> 
> diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
> index 3932f92..fe5ec82 100644
> --- a/drivers/hwmon/hwmon.c
> +++ b/drivers/hwmon/hwmon.c
> @@ -545,8 +545,10 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
>  	int i, j, err, id;
>  
>  	/* Do not accept invalid characters in hwmon name attribute */
> -	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
> +	if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) {
> +		printk("hwmon: Invalid character detected: %s\n", name);
>  		return ERR_PTR(-EINVAL);
> +	}
>  
>  	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
>  	if (id < 0)
> 
> 
> pavel@...0:~$ dmesg | grep -5 Invalid
> [    0.829650] of_get_named_gpiod_flags: parsed 'gpio-reset' property
> of node '/ocp@...00000/i2c@...72000/tlv320aic3x@19[0]' - status (0)
> [    0.833831] tsl2563 2-0029: model 7, rev. 0
> [    0.837768] of_get_named_gpiod_flags: parsed 'enable-gpio' property
> of node '/ocp@...00000/i2c@...72000/lp5523@32[0]' - status (0)
> [    1.921417] omap_i2c 48072000.i2c: controller timed out
> [    2.056823] lp5523x 2-0032: lp5523 Programmable led chip found
> [    2.064147] hwmon: Invalid character detected: bq27200-0

So the problem is really that the thermal driver needs to create a valid name.

Guenter

> [    2.064544] bq27xxx-battery 2-0055: failed to register battery
> [    2.064605] bq27xxx-battery: probe of 2-0055 failed with error -22
> [    2.065368] of_get_named_gpiod_flags: parsed 'power-gpio' property
> of node '/ocp@...00000/i2c@...72000/tpa6130a2@60[0]' - status (0)
> [    2.083221] bq2415x-charger 2-006b: automode supported, waiting for
> events
> [    2.084442] bq2415x-charger 2-006b: driver registered
> --
> [    2.369842] g_ether gadget: g_ether ready
> [    2.377197] tsc2005 spi1.0: GPIO lookup for consumer reset
> [    2.377227] tsc2005 spi1.0: using device tree for GPIO lookup
> [    2.377288] of_get_named_gpiod_flags: parsed 'reset-gpios' property
> of node '/ocp@...00000/spi@...98000/tsc2005@0[0]' - status (0)
> [    2.378936] input: TSC2005 touchscreen as
> /devices/platform/68000000.ocp/48098000.spi/spi_master/spi1/spi1.0/input/input5
> [    2.395111] hwmon: Invalid character detected: rx51-battery
> [    2.402587] rx51-battery: probe of n900-battery failed with error
> -22
> [    2.410247] omap_hsmmc 4809c000.mmc: GPIO lookup for consumer cd
> [    2.410247] omap_hsmmc 4809c000.mmc: using device tree for GPIO
> lookup
> [    2.410278] of_get_named_gpiod_flags: can't parse 'cd-gpios'
> property of node '/ocp@...00000/mmc@...9c000[0]'
> [    2.410278] of_get_named_gpiod_flags: can't parse 'cd-gpio'
> property of node '/ocp@...00000/mmc@...9c000[0]'
> 
> 									Pavel
> 
> 
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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