Hi Simon, > Hi Lukasz, > > On Mon, 3 Dec 2018 at 15:13, Lukasz Majewski <lu...@denx.de> wrote: > > > > Dear All, > > > > I've stumbled upon a following issue: > > > > - I do have a vybrid SoC which is not using SPL. It only uses U-boot > > proper (u-boot.vyb). > > > > - In the board_early_init_f() (when we are still in SRAM) I do > > perform pinctrl (pinmux) setup for UART1 (this is the console > > device). > > > > - I also do use ucalss-serial.c for this device and have proper > > pinmux definition for it in the *.dts file - but this is done > > latter. > > > > The problem is that, when I try to remove pinmux setup code > > (imx_iomux_v3_setup_multiple_pads()) from board_early_init_f(), > > then I do see uart output late (no U-boot early output - U-Boot > > 2018.11-00052-g6552299a40-dirty (Nov 23 2018 - 16:13:51 +0100)). > > > > The reason for this is the lack of pinctrl UART pins setup. > > > > > > Do you see any idea how to move to full dts support for uart? The > > uart driver and pinmux have defined DM_FLAG_PRE_RELOC. > > Is this due to pinconfig_post_bind() only operating after relocation?
Please correct me if I'm wrong, but post_bind() callback is called with device_bind_* family of functions? Those functions - e.g. device_bind() are used in an interesting way - e.g.: drivers/gpio/s5p_gpio.c -> gpio_exynos_bind(). The problem seems to be with the time pinctrl device itself is probed (way after board_early_init_f()). IMHO it would be enough to "probe" pinctrl itself very early (before relocation - DDR setup) to just configure pins from iomux's pictrl_hog group (and put there DDR and uart pins) - not waiting for other devices to be "discovered" (like uart). > > > > > > > The same kind of problem I do have with DDR memory controller pin > > setup. It would be nice to have it all in DTS, not in a board file. > > > > > > > > > > [ My idea would be to manually extract relevant data from fdt blob > > and configure pins in board_early_init_f(), but this looks like a > > hack - maybe there is another, better solution? ] > > Hopefully :-) > > Regards, > Simon Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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