riscv: add Allwinner D1 device tree

[mhorne]

Summary

Obtained from: https://github.com/smaeul/linux/commit/06b026a8b7148f18356c5f809e51f013c2494587

Signed-off-by: Julien Cassette <[e-mail]>

Test Plan

The DTB files are built.

[jrtc27]

Why do we need this? Device trees should come from the firmware in this day and age...

[julien.cassette_gmail.com]

In D34748#787493, @jrtc27 wrote:

Why do we need this? Device trees should come from the firmware in this day and age...

Hello Jessica.
Since this is done for other devices, I guessed this was needed for some cases (e.g. maybe the firmware does not always provide the exact DTB we expect?), or even just for documentation purposes.
Regards, Julien.

[jrtc27]

In D34748#787517, @julien.cassette_gmail.com wrote:

In D34748#787493, @jrtc27 wrote:

Why do we need this? Device trees should come from the firmware in this day and age...

Hello Jessica.
Since this is done for other devices, I guessed this was needed for some cases (e.g. maybe the firmware does not always provide the exact DTB we expect?), or even just for documentation purposes.
Regards, Julien.

This was added for the SiFive Unleashed because initially there was no proper firmware, U-Boot came later and instead you just had to direct boot a kernel. There is no need for it any more even there.

[julien.cassette_gmail.com]

In D34748#787522, @jrtc27 wrote:

In D34748#787517, @julien.cassette_gmail.com wrote:

In D34748#787493, @jrtc27 wrote:

Why do we need this? Device trees should come from the firmware in this day and age...

Hello Jessica.
Since this is done for other devices, I guessed this was needed for some cases (e.g. maybe the firmware does not always provide the exact DTB we expect?), or even just for documentation purposes.
Regards, Julien.

This was added for the SiFive Unleashed because initially there was no proper firmware, U-Boot came later and instead you just had to direct boot a kernel. There is no need for it any more even there.

Okay, thanks for the explanation. I guess we can drop the review then.

[emaste]

There is no need for it any more even there.

Shall we remove it to avoid any confusion? Presumably we are no longer interested in supporting SiFive Unleashed cases without uboot.

[manu]

In D34748#787493, @jrtc27 wrote:

Why do we need this? Device trees should come from the firmware in this day and age...

The headers are still needed, I guess I need to update the vendor import.

[emaste]

Note that sun20i-d1-msgbox.h is listed as GPL-only

[bcr]

Remove core-team, as we do not seem to get involved in this.

[mhorne]

Closing this, as the DTS sources are now present in the tree, imported from Linux.

The logic to build and distribute the DTB may be added as a future step, but it is not currently required as we rely on the DTB from u-boot.