On Sun, 16 Aug 2020 14:54:41 +0200
Jonathan Neuschäfer <j.neuschae...@gmx.net> wrote:
> On Sat, Aug 15, 2020 at 09:33:36PM +0200, Andreas Kemnade wrote:
> > This adds a devicetree for the Tolino Shine 2 HD Ebook reader. It is based
> > on boards marked with "37NB-E60QF0+4A2". It is equipped with an i.MX6SL
> > SoC.
> >
> > Expected to work:
> > - Buttons
> > - Wifi
> > - Touchscreen
> > - LED
> > - uSD
> > - USB
> > - RTC
> >
> > Not working due to missing drivers:
> > - Backlight (requires NTXEC driver)
> > - EPD
> >
> > Not working due to unknown reasons:
> > - deep sleep (echo standby >/sys/power/state works),
> > wakeup fails when imx_gpc_pre_suspend(true) was called.
> >
> > Signed-off-by: Andreas Kemnade <andr...@kemnade.info>
> > ---
> > Reason for RFC: The suspend trouble might be caused by bad devicetree.
> > But as the devicetree is already useful I decided to submit it.
> [...]
> > +++ b/arch/arm/boot/dts/imx6sl-tolino-shine2hd.dts
> > @@ -0,0 +1,582 @@
> > +// SPDX-License-Identifier: (GPL-2.0)
>
> I don't think the parentheses are required when you don't have a logical
> operator (OR) in the SPDX expression.
>
> > +&i2c1 {
> > + pinctrl-names = "default","sleep";
> > + pinctrl-0 = <&pinctrl_i2c1>;
> > + pinctrl-1 = <&pinctrl_i2c1_sleep>;
> > + status = "okay";
> > +
> > + /* TODO: embedded controller at 0x43 (driver missing) */
>
> Sorry for the delay, BTW. I'm still (slowly) working on v2.
>
> > + ricoh619: pmic@32 {
> > + compatible = "ricoh,rc5t619";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_ricoh_gpio>;
> > + reg = <0x32>;
> > + interrupt-parent = <&gpio5>;
> > + interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
> > + system-power-controller;
> > +
> > + regulators {
>
> How did you derive the regulator voltages?
>
Several sources:
- deriving from the existing device trees,
- looking for board specific variances in
board-mx6sl_ntx.c of the Tolino kernel,
- looking for comments in the file.
I compared a register dump of the PMIC from both the vendor kernel
and my devicetree and found no significant differences.
> > + pinctrl_hog: hoggrp {
> > + fsl,pins = <
> > + MX6SL_PAD_LCD_DAT0__GPIO2_IO20 0x79
> > + MX6SL_PAD_LCD_DAT1__GPIO2_IO21 0x79
> > + MX6SL_PAD_LCD_DAT2__GPIO2_IO22 0x79
> > + MX6SL_PAD_LCD_DAT3__GPIO2_IO23 0x79
> > + MX6SL_PAD_LCD_DAT4__GPIO2_IO24 0x79
> > + MX6SL_PAD_LCD_DAT5__GPIO2_IO25 0x79
> > + MX6SL_PAD_LCD_DAT6__GPIO2_IO26 0x79
> > + MX6SL_PAD_LCD_DAT7__GPIO2_IO27 0x79
> > + MX6SL_PAD_LCD_DAT8__GPIO2_IO28 0x79
> > + MX6SL_PAD_LCD_DAT9__GPIO2_IO29 0x79
> > + MX6SL_PAD_LCD_DAT10__GPIO2_IO30 0x79
> > + MX6SL_PAD_LCD_DAT11__GPIO2_IO31 0x79
> > + MX6SL_PAD_LCD_DAT12__GPIO3_IO00 0x79
> > + MX6SL_PAD_LCD_DAT13__GPIO3_IO01 0x79
> > + MX6SL_PAD_LCD_DAT14__GPIO3_IO02 0x79
> > + MX6SL_PAD_LCD_DAT15__GPIO3_IO03 0x79
> > + MX6SL_PAD_LCD_DAT16__GPIO3_IO04 0x79
> > + MX6SL_PAD_LCD_DAT17__GPIO3_IO05 0x79
> > + MX6SL_PAD_LCD_DAT18__GPIO3_IO06 0x79
> > + MX6SL_PAD_LCD_DAT19__GPIO3_IO07 0x79
> > + MX6SL_PAD_LCD_DAT20__GPIO3_IO08 0x79
> > + MX6SL_PAD_LCD_DAT21__GPIO3_IO09 0x79
> > + MX6SL_PAD_LCD_DAT22__GPIO3_IO10 0x79
> > + MX6SL_PAD_LCD_DAT23__GPIO3_IO11 0x79
> > + MX6SL_PAD_LCD_CLK__GPIO2_IO15 0x79
> > + MX6SL_PAD_LCD_ENABLE__GPIO2_IO16 0x79
> > + MX6SL_PAD_LCD_HSYNC__GPIO2_IO17 0x79
> > + MX6SL_PAD_LCD_VSYNC__GPIO2_IO18 0x79
> > + MX6SL_PAD_LCD_RESET__GPIO2_IO19 0x79
> > + MX6SL_PAD_KEY_COL3__GPIO3_IO30 0x79
> > + MX6SL_PAD_KEY_ROW7__GPIO4_IO07 0x79
> > + MX6SL_PAD_ECSPI2_MOSI__GPIO4_IO13 0x79
> > + MX6SL_PAD_KEY_COL5__GPIO4_IO02 0x79
> > + MX6SL_PAD_KEY_ROW6__GPIO4_IO05 0x79
> > + >;
> > + };
>
> Why are there so many hogged pins? Will some of them receive a proper
> configuration once the EPDC driver is implemented?
>
I copied them over and found no hints in the
Tolino kernel that it is a bad idea.
Regards,
Andreas
