Re: [PATCH 5/5] ARM: i.MX8MM: add Hexagon Geosystems GS05

SCHNEIDER Johannes
2026-02-06T14:08:17Z

Hoi

>
> Hi,
>
> On 2/5/26 4:45 PM, Marco Felsch wrote:
> > This adds support for the Hexagon Geosystems GS05 which is part of the
> > System1600 platform.
> >
> > Co-developed-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
>
> fyi, correct procedure for Linux would be for co-developed-by to be
> followed by s-o-b, but I won't insist on it here.
>
> > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> > ---
>

some/very few of the original patches that went into this upstreamable version
came from me - i'll leave it up to marco to either keep the co-devleoped-by, add
my signed-of-by and/or have both.

>
>
> > +static int ar8031_phy_fixup(struct phy_device *phydev)
> > +{
> > + /* enable rgmii rxc skew and phy mode select to RGMII copper */
> > + phy_write(phydev, 0x1d, 0x1f);
> > + phy_write(phydev, 0x1e, 0x8);
> > + phy_write(phydev, 0x1d, 0x00);
> > + phy_write(phydev, 0x1e, 0x82ee);
> > + phy_write(phydev, 0x1d, 0x05);
> > + phy_write(phydev, 0x1e, 0x100);
> > +
> > + return 0;
>
> barebox supports qca,clk-out-frequency, qca,clk-out-strength and
> phy-mode properties to apply these fixups to the PHY.
>
> This is useful if you have the same PHY elsewhere, e.g. behind a switch
> as you can identify the specific PHY that should have these settings
> applied. It also allows a faster boot as you could skip network probe in
> barebox and do the fixups in Linux if the device tree lists them.
>
> Just for your information. As you guard this behind your board
> compatible, I can live with it.
>

the GS05 itself actually has no phy - at least the "customer relesae" one.
the AR8033 phy is on a 'debug board'; alongside a ft232rq.

> > +}
> > +
> > +static struct hgs_machine *
> > +hgs_gs05_get_board_from_legacy(const unsigned char *serial)
> > +{
> > + struct hgs_gs05_legacy_machine *machine = hgs_gs05_legacy_variants;
> > +
> > + for (; machine->revision; machine++)
> > + if (serial[6] == machine->revision)
> > + return &machine->machine;
> > +
> > + return ERR_PTR(-EINVAL);
> > +}
> > +
> > +static struct hgs_machine *
> > +hgs_gs05_select_board(const unsigned char *serial, bool legacy_format)
> > +{
> > + struct hgs_machine *machine = hgs_gs05_variants;
> > + const struct hgs_board_revision *rev;
> > +
> > + /* TODO: Remove legacy handling if no longer required */
> > + if (legacy_format)
> > + return hgs_gs05_get_board_from_legacy(serial);
> > +
> > + rev = hgs_get_rev_from_part_trace((struct hgs_part_trace_code *)serial);
> > + if (!rev)
> > + return ERR_PTR(-EINVAL);
> > +
> > + for (; machine->dts_compatible; machine++)
> > + if (rev->id == machine->revision)
> > + return machine;
> > +
> > + return ERR_PTR(-EINVAL);
> > +}
> > +
> > +static u64
> > +hgs_gs05_set_efi_poll_intervall(struct device *efid, u64 new_polling_interval)
> > +{
> > + const char *old_interval_str;
> > + char *new_interval;
> > + u64 old_interval;
> > +
> > + old_interval_str = dev_get_param(efid->parent, "polling_interval");
> > + kstrtoull(old_interval_str, 10, &old_interval);
> > +
> > + pr_debug("Update EFI UART-Rx poll interval: %llu ns -> %llu ns\n",
> > + old_interval, new_polling_interval);
> > +
> > + new_interval = basprintf("%llu", new_polling_interval);
> > + dev_set_param(efid->parent, "polling_interval", new_interval);
> > + free(new_interval);
> > +
> > + return old_interval;
> > +}
> > +
> > +/* '"' + sizeof(struct hgs_part_trace_code) + '"' + string delim '\0' */
> > +#define HGS_GS05_SERIAL_NUMBER_CHARS \
> > + (1 + sizeof(struct hgs_part_trace_code) + 1 + 1)
> > +
> > +static struct hgs_machine *hgs_gs05_get_board(struct device_d *dev)
>
> Should there be a v2, you can use the occasion to replace all device_d
> and driver_d with device and driver respectively.
>
> > + chosen {
> > + environment-emmc {
> > + compatible = "barebox,environment";
> > + device-path = &usdhc3, "partname:barebox-environment";
> > + status = "disabled";
> > + };
> > + };
>
> Does your board happen to have the barebox env GPT partition type UUID?
> In that case, you could also control this via autoload_external_env()
> or env.autoprobe instead of having to hardcode anything in DT.
>
> > +/ {
> > + /* compatible containing the correct revision and model is patched via board file */
> > + compatible = "hgs,gs05", "fsl,imx8mm";
> > + model = "Hexagon Geosystems GS05";
> > +
> > + aliases {
> > + efiwdt = &efi_wdt;
>
> Do you not have a kernel driver for the watchdog? You may want to use
> watchdog0 and watchdog1 in that case to be able to identify them reliably.
>

good point - there would be also imx internal watchdog (connected to the pmic)

gruß
Johannes

>
> > + };
> > +
> > + /*
> > + * Prohibit OP-TEE from turning of the UART output if enabled via
> > + * CFG_UART_BASE. To do so we need to specify a stdout-path which
> > + * doesn't exist else OP-TEE turns off the UART.
> > + */
> > + secure-chosen {
> > + stdout-path = "/this-path/does/not/exist";
>
> ... :/
>
> > +&usdhc3 { /* eMMC */
> > + assigned-clocks = <&clk IMX8MM_CLK_USDHC3_ROOT>;
> > + assigned-clock-rates = <400000000>;
> > + pinctrl-names = "default", "state_100mhz", "state_200mhz";
> > + pinctrl-0 = <&pinctrl_usdhc3>;
> > + pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
> > + pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
> > + bus-width = <8>;
> > + non-removable;
>
> no-sd;
> no-sdio;
>
> to skip their detect?
>
> > + pinctrl_gpio1: gpio1grp {
> > + fsl,pins = <
> > + MX8MM_IOMUXC_GPIO1_IO10_GPIO1_IO10 0x100
>
> This looks a bit unconventional. Can't the consumer select this group?
>
> > +config BOARD_HGS
> > + bool
> > + select ARCH_IMX_ATF_PASS_BL_PARAMS
> > + select ARM_SMCCC
> > + select FIRMWARE_IMX_LPDDR4_PMU_TRAIN
> > + select I2C_IMX_EARLY
> > + select IMX8M_DRAM
> > + select HABV4
>
> Do you need to select this one? I think it would be better without to
> allow it to be enabled in the defconfig without flipping HABv4 on for
> all other boards?
>
> > +static int hgs_console_open_fixup(struct device_node *root, void *context)
> > +{
> > + struct hgs_machine *machine = context;
> > + struct device_node *console_np;
> > + struct property *property;
> > +
> > + console_np = of_find_node_by_alias(root, machine->console_alias);
> > + if (!console_np)
> > + return -EINVAL;
> > +
> > + property = of_rename_property(console_np, "pinctrl-1", "pinctrl-0");
>
> Does this not yield an invalid DT when passed to the kernel?
> I think you want to either keep pinctrl-1 as is or shorten pinctrl-names
> as well.
>
> > + pinctrl = pinctrl_get_select(console->dev, "uart");
>
> Nitpick: I think a name like "open" might be clearer?
>
>
> Cheers,
> Ahmad
>
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