[PATCH v4] imx: add i.MX8MN DDR3L evk board support

[Michael Nazzareno Trimarchi]

Hi Heiko

On Sun, Jun 19, 2022 at 8:12 AM Heiko Thiery <heiko.thiery at gmail.com> wrote:
>
> Hi,
>
> Am So., 19. Juni 2022 um 07:59 Uhr schrieb Michael Nazzareno Trimarchi
> <michael at amarulasolutions.com>:
> >
> > Hi
> >
> > Il sab 18 giu 2022, 23:56 Heiko Thiery <heiko.thiery at gmail.com> ha scritto:
> >>
> >> Hi Michael, Hi Marek,
> >>
> >> Am Mi., 15. Juni 2022 um 08:43 Uhr schrieb Michael Nazzareno Trimarchi
> >> <michael at amarulasolutions.com>:
> >> >
> >> > Hi Heiko
> >> >
> >> > On Wed, Jun 15, 2022 at 8:23 AM Heiko Thiery <heiko.thiery at gmail.com> wrote:
> >> > >
> >> > > Hi Marek,
> >> > >
> >> > > [SNIP]
> >> > >
> >> > > > > diff --git a/board/freescale/imx8mn_evk/spl.c b/board/freescale/imx8mn_evk/spl.c
> >> > > > > index 14cb51368f..0d9909a662 100644
> >> > > > > --- a/board/freescale/imx8mn_evk/spl.c
> >> > > > > +++ b/board/freescale/imx8mn_evk/spl.c
> >> > > > > @@ -83,6 +83,15 @@ int power_init_board(void)
> >> > > > >  #ifdef CONFIG_IMX8MN_LOW_DRIVE_MODE
> >> > > > >         /* Set VDD_SOC/VDD_DRAM to 0.8v for low drive mode */
> >> > > > >         pmic_reg_write(dev, PCA9450_BUCK1OUT_DVS0, 0x10);
> >> > > > > +#elif defined(CONFIG_TARGET_IMX8MN_DDR3L_EVK)
> >> > > > > +       /* Set VDD_SOC to 0.85v for DDR3L at 1600MTS */
> >> > > > > +       pmic_reg_write(dev, PCA9450_BUCK1OUT_DVS0, 0x14);
> >> > > > > +
> >> > > > > +       /* Disable the BUCK2 */
> >> > > > > +       pmic_reg_write(dev, PCA9450_BUCK2CTRL, 0x48);
> >> > > > > +
> >> > > > > +       /* Set NVCC_DRAM to 1.35v */
> >> > > > > +       pmic_reg_write(dev, PCA9450_BUCK6OUT, 0x1E);
> >> > > > >  #else
> >> > > >
> >> > > > All this part is not done by the spl pmic driver?
> >> > >
> >> > > I saw that you added the PCA9450 driver. Do you know if this
> >> > > initialization can be done by the driver when CONFIG_SPL_DM_REGULATOR
> >> > > is enabled? If I see this correctly, it can't be done. Is that
> >> > > correct?
> >> >
> >> > +&i2c1 {
> >> > +       u-boot,dm-spl;
> >> > +};
> >> > +
> >> > +&{/soc at 0/bus at 30800000/i2c at 30a20000/pmic at 4b} {
> >> > +       u-boot,dm-spl;
> >> > +};
> >> > +
> >> > +&{/soc at 0/bus at 30800000/i2c at 30a20000/pmic at 4b/regulators} {
> >> > +       u-boot,dm-spl;
> >> > +};
> >> > +
> >> > +&pinctrl_i2c1 {
> >> > +       u-boot,dm-spl;
> >> > +};
> >> > +
> >> > +&pinctrl_pmic {
> >> > +       u-boot,dm-spl;
> >> > +};
> >> > +
> >> >
> >> > Maybe something like this should work. Now question is about should be
> >> > done in pre-reloc or not
> >>
> >> It took me a little while to understand what was meant by this. In the
> >> meantime I could
> >> change the PMIC/Regulator initialization to DT/DM and can make the setting so.
> >> What is not clear to me yet is at which point this should be done
> >> (regulators_enable_boot_on()). Currently I do it in the board/spl
> >> specific board_init_f().
> >>
> >> Do any of you have any advice here?
> >
> >
> > After having a discussion with you, i found that maybe i have some problem and some of the setting should be done before ddr inizialization. I will take a look on it on afternoon. I know marek was working on some way to probe driver during binding and we need even to be sure that this can happen before memory training.
> >
>
> Currently I added it in  board_init_f() right before spl_dram_init()
> [1] and it works. I also tried to put it in power_init_board() [2] but
> this does not work.
>
> [1] https://elixir.bootlin.com/u-boot/v2022.04/source/board/freescale/imx8mn_evk/spl.c#L162
> [2] https://elixir.bootlin.com/u-boot/v2022.04/source/board/freescale/imx8mn_evk/spl.c#L62

Does it work if you mark pre-reoloc, pmic, i2c, and  pinctrl?

Michael

>
> --
> Heiko
>
> > Michael
> >>
> >>
> >> Thanks
> >> --
> >> Heiko
> >>
> >> > Michael
> >> > >
> >> > > --
> >> > > Heiko
> >> >
> >> >
> >> >
> >> > --
> >> > Michael Nazzareno Trimarchi
> >> > Co-Founder & Chief Executive Officer
> >> > M. +39 347 913 2170
> >> > michael at amarulasolutions.com
> >> > __________________________________
> >> >
> >> > Amarula Solutions BV
> >> > Joop Geesinkweg 125, 1114 AB, Amsterdam, NL
> >> > T. +31 (0)85 111 9172
> >> > info at amarulasolutions.com
> >> > www.amarulasolutions.com



-- 
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael at amarulasolutions.com
__________________________________

Amarula Solutions BV
Joop Geesinkweg 125, 1114 AB, Amsterdam, NL
T. +31 (0)85 111 9172
info at amarulasolutions.com
www.amarulasolutions.com