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

[Michael Nazzareno Trimarchi]

Hi

Il dom 19 giu 2022, 16:47 Heiko Thiery <heiko.thiery at gmail.com> ha scritto:

> Hi,
>
> Am So., 19. Juni 2022 um 16:40 Uhr schrieb Michael Nazzareno Trimarchi
> <michael at amarulasolutions.com>:
> >
> > 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?
>
> I added on all nodes the u-boot,dm-pre-reloc but this does not help
> when trying to do the init in power_init_board().
>

>From code I navigate spl_early_init should bind the driver in pre-reloc

Michael

>
> >
> > 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
>