linux-kernel - Re: [RFC PATCH 00/10] Netronix embedded controller driver for Kobo and Tolino ebook readers

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Date:   Tue, 30 Jun 2020 21:22:07 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        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>
Subject: Re: [RFC PATCH 00/10] Netronix embedded controller driver for Kobo
 and Tolino ebook readers

On Tue, 30 Jun 2020 09:15:23 +0200
Jonathan Neuschäfer <j.neuschaefer@....net> wrote:

> On Tue, Jun 30, 2020 at 08:40:51AM +0200, Andreas Kemnade wrote:
> [...]
> > got a chance to test it on a Tolino Shine 2 HD.
> > It uses the RTC from the RC5T619 but backlight seems to go via MSP430
> > EC.
> > 
> > I got this.
> > 
> > [    1.453603] ntxec 0-0043: Netronix embedded controller version f110 detected.
> > [   10.723638] ntxec-rtc 21a0000.i2c:embedded-controller@43:rtc: registered as rtc0
> > [   10.775276] ntxec-pwm: probe of 21a0000.i2c:embedded-controller@43:pwm failed with error -5  
> 
> Hmm, -EIO from the PWM driver.
>
Weird...
IOMUXC_SW_PAD_CTL_PAD_I2C1_SDA/SCL is identical between
vendor kernel (heavily patched 3.0.35) and patched mainline.
                        
MX6SL_PAD_I2C1_SCL__I2C1_SCL     0x4001f8b1
MX6SL_PAD_I2C1_SDA__I2C1_SDA     0x4001f8b1

root@...ino2:~# i2cset -f 0 0x43 0xa3 0x0001 w
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will write to device file /dev/i2c-0, chip address 0x43, data address
0xa3, data 0x01, mode word.
Continue? [Y/n] 
Error: Write failed
root@...ino2:~# i2cset -f 0 0x43 0xa3 0x0000 w
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will write to device file /dev/i2c-0, chip address 0x43, data address
0xa3, data 0x00, mode word.
Continue? [Y/n] 
Error: Write failed

but backlight gets toggled. Same behavior on vendor kernel and
in vendor uboot.
That smells.

Regards,
Andreas