Re: [PATCH v1 5/6] ARM: dts: rockchip: add reboot-mode node

Andy Yan
2015-12-22T13:37:23Z

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Hi Heiko:

2015-12-22 19:23 GMT+08:00 Heiko Stübner <heiko@sntech.de>:

> Hi Andy,
>
> Am Dienstag, 22. Dezember 2015, 17:16:52 schrieb Andy Yan:
> > Add reboot mode driver DT node for rk3xxx,rk3288 platform
>
> in general, I like that concept a lot :-) . Below some small issues.
>
>
> > Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
> >
> > ---
> >
> > Changes in v1:
> > - correct the maskrom magic number
> > - use macro defined in rockchip_boot-mode.h for reboot-mode DT node
> >
> > arch/arm/boot/dts/rk3288.dtsi | 26 ++++++++++++++++++++++++++
> > arch/arm/boot/dts/rk3xxx.dtsi | 26 ++++++++++++++++++++++++++
> > 2 files changed, 52 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/rk3288.dtsi
> b/arch/arm/boot/dts/rk3288.dtsi
> > index 04ea209..c6ea207 100644
> > --- a/arch/arm/boot/dts/rk3288.dtsi
> > +++ b/arch/arm/boot/dts/rk3288.dtsi
> > @@ -45,6 +45,7 @@
> > #include <dt-bindings/clock/rk3288-cru.h>
> > #include <dt-bindings/thermal/thermal.h>
> > #include <dt-bindings/power/rk3288-power.h>
> > +#include <dt-bindings/soc/rockchip_boot-mode.h>
> > #include "skeleton.dtsi"
> >
> > / {
> > @@ -170,6 +171,31 @@
> > };
> > };
> >
> > + reboot_mode {
>
> nodes are commonly written with a dash "-" instead of an underscore "_".
>

okay, I will use dash "-" in next version.

>
>
> > + compatible = "rockchip,reboot-mode";
> > + rockchip,regmap = <&pmu>;
>
> I do believe this should be a sub-node of the pmu, similar to the power-
> domains. Due to the "simple-mfd" compatible of the pmu, it will get probed
> automatically and the driver can than get the regmap via
>
> parent = dev->parent;
> regmap = syscon_node_to_regmap(parent->of_node);
>
> as the power-domains do and therefore also doesn't need the rockchip,regmap
> property.
>
>
> okay, got it.

> > + offset = <0x94>;
> > + loader {
> > + linux,mode = "loader";
> > + linux,magic = <BOOT_LOADER>;
>
> linux,mode seems correct, but the magic value is actually not
> linux-specific
> but instead firmware-specific, so I'm not sure about that linux-prefix
> there
>
> But I guess that would be for the dt-people :-)
>
>
> Hope the dt-people will give some advices

> + };
> > +
> > + maskrom {
> > + linux,mode = "maskrom";
> > + linux,magic = <BOOT_MASKROM>;
> > + };
>
> Just for my understanding, while I expect the bootloader to interpret the
> other values, does the maskrom read and handle this one?
>

actually, this is also handled by the bootloader, this will be handled
before
the DDR initialization.

>
>
> > +
> > + recovery {
> > + linux,mode = "recovery";
> > + linux,magic = <BOOT_RECOVERY>;
> > + };
> > +
> > + fastboot {
> > + linux,mode = "fastboot";
> > + linux,magic = <BOOT_FASTBOOT>;
> > + };
> > + };
> > +
> > reserved-memory {
> > #address-cells = <1>;
> > #size-cells = <1>;
>
> I do believe rk3288-veyron.dtsi would need some sort of special handling.
> I don't think coreboot interprets most of those handles, but I guess only
> the
> maskrom one would be handled by the maskrom?
>

yes, these depends on the bootloader.

>
>
> Heiko
>
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