Re: [PATCH v2 3/3] drm/nuvoton: add MA35D1 display controller driver

[Joey Lu]

On 2/10/2026 8:02 PM, Icenowy Zheng wrote:
> 在 2026-02-09星期一的 16:45 +0800，Joey Lu写道：
> > On 2/6/2026 11:09 PM, Icenowy Zheng wrote:
> > > 在 2026-01-29星期四的 12:05 +0800，Joey Lu写道：
> > > > ========== 8< ============
> > > > +#endif
> > > > diff --git a/drivers/gpu/drm/nuvoton/ma35_regs.h
> > > > b/drivers/gpu/drm/nuvoton/ma35_regs.h
> > > > new file mode 100644
> > > > index 000000000000..0f4a7a13e7d8
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/nuvoton/ma35_regs.h
> > > > @@ -0,0 +1,88 @@
> > > > +/* SPDX-License-Identifier: GPL-2.0+ */
> > > > +/*
> > > > + * Nuvoton DRM driver
> > > > + *
> > > > + * Copyright (C) 2026 Nuvoton Technology Corp.
> > > > + *
> > > > + * Author: Joey Lu <a0987203069@xxxxxxxxx>
> > > > + */
> > > > +
> > > > +#ifndef _MA35_REGS_H_
> > > > +#define _MA35_REGS_H_
> > > > +
> > > > +#define MA35_FRAMEBUFFER_CONFIG                   0x1518
> > > Please check my Verisilicon DC8200 driver, which is already part of
> > > drm-misc-next now.
> > >
> > > The display controller here seems to be a earlier one from
> > > Verisilicon.it looks like a DC8000, or maybe a more earlier one?
> > The DCU is a Vivante DCUltra IP rather than a DC8000 series.
> >
> > It's an earlier generation display controller and was customized for
> > Nuvoton, so it doesn't have a public model ID.
> >
> > Because of that lineage, parts of the register layout and
> > functionality
> > remain similar to older DC IPs.
> The kernel seems to dislike different drivers for similar IPs.
>
> > Please refer to MA35D1 datasheet for more details.
> I checked it, and the register definitions looks compatible with DC8000
> registers at [1]. However no identification information is shown in the
> manual.
>
> I may get a MA35D1 board after the Lunar New Year (although it looks a
> little expensive), is it easy to bring up mainline kernal on arbitary
> MA35D1 boards?
>
> [1]
> https://github.com/milkv-megrez/rockos-u-boot/blob/c9221cf2fa77d39c0b241ab4b030c708e7ebe279/drivers/video/eswin/eswin_dc_reg.h
Our team is actively working on upstreaming support for MA35D1. It is 
possible to bring up the mainline kernel on arbitrary MA35D1 boards, but 
for the best experience I strongly recommend using our Buildroot[1] or 
Yocto[2] tooling available on the official GitHub. These provide 
board-specific configurations and greatly simplify the process.

If you decide to get an MA35D1 board yourself, our Buildroot/Yocto setup 
will help you get started quickly and ensure you have the right patches 
and configurations in place.

Currently, the mainline kernel version is 6.6, which is sufficient for 
checking registers and basic functionality. For more complete feature 
support, our Buildroot/Yocto tooling remains the recommended path.

[1] https://github.com/OpenNuvoton/buildroot_2024

[2] https://github.com/OpenNuvoton/MA35D1_yocto-v5.0

Best regards,

Joey