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

Hi,

On Sun, 21 Jun 2020 00:39:04 +0200
Jonathan Neuschäfer [off-list ref] wrote:

Hi,

This patchset adds basic support for the embedded controller found on
older ebook reader boards designed by/with the ODM Netronix Inc.[1] and
sold by Kobo or Tolino, for example the Kobo Aura and the Tolino Shine.
These drivers are based on the vendor kernel sources, but in order to
all information in a single place, I documented the register interface
of the EC on GitHub[4].

A few things still needs to be ironed out, hence the RFC tag:
 - The reboot/reset handler in patch 3/10 calls into I2C code, which may
   sleep, but reboot handlers are apparently not allowed to sleep.
 - I'm not sure I got the YAML DT bindings right. I have also included
   the plain text DT bindings for reference.

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
[   10.850597] ntxec-rtc 21a0000.i2c:embedded-controller@43:rtc: hctosys: unable to read the hardware clock

version number matchess with what the vendor kernel reports. Maybe we
should document which version is running on which devices?

&i2c1 {
        pinctrl-names = "default","sleep";
        pinctrl-0 = <&pinctrl_i2c1>;
        pinctrl-1 = <&pinctrl_i2c1_sleep>;
        status = "okay";

        embedded-controller@43 {
//              pinctrl-names = "default";
//              pinctrl-0 = <&pinctrl_ec>;
                compatible = "netronix,ntxec";
                reg = <0x43>;
                interrupts-extended = <&gpio5 11 IRQ_TYPE_EDGE_FALLING>;
                interrupt-controller;
                #interrupt-cells = <1>;

                ec_pwm: pwm {
                        compatible = "netronix,ntxec-pwm";
                        #pwm-cells = <2>;
                };

                rtc {
                        compatible = "netronix,ntxec-rtc";
                };
        };
};

Regards,
Andreas

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