linux-kernel - Re: [PATCH v5 20/21] riscv: dts: thead: Introduce reset controller node

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Message-ID: <aAvfn2mq0Ksi8DF2@x1>
Date: Fri, 25 Apr 2025 12:16:47 -0700
From: Drew Fustini <drew@...7.com>
To: Michal Wilczynski <m.wilczynski@...sung.com>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, guoren@...nel.org,
	wefu@...hat.com, jassisinghbrar@...il.com, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, frank.binns@...tec.com,
	matt.coster@...tec.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
	simona@...ll.ch, ulf.hansson@...aro.org, jszhang@...nel.org,
	p.zabel@...gutronix.de, m.szyprowski@...sung.com,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 20/21] riscv: dts: thead: Introduce reset controller
 node

On Tue, Apr 22, 2025 at 09:47:34AM +0200, Michal Wilczynski wrote:
> 
> 
> On 4/19/25 21:09, Drew Fustini wrote:
> > On Wed, Feb 19, 2025 at 03:02:38PM +0100, Michal Wilczynski wrote:
> >> T-HEAD TH1520 SoC requires to put the GPU out of the reset state as part
> >> of the power-up sequence.
> >>
> >> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> >> ---
> >>  arch/riscv/boot/dts/thead/th1520.dtsi | 7 +++++++
> >>  1 file changed, 7 insertions(+)
> >>
> >> diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
> >> index 474f31576a1b..6b34aab4b455 100644
> >> --- a/arch/riscv/boot/dts/thead/th1520.dtsi
> >> +++ b/arch/riscv/boot/dts/thead/th1520.dtsi
> >> @@ -7,6 +7,7 @@
> >>  #include <dt-bindings/interrupt-controller/irq.h>
> >>  #include <dt-bindings/clock/thead,th1520-clk-ap.h>
> >>  #include <dt-bindings/power/thead,th1520-power.h>
> >> +#include <dt-bindings/reset/thead,th1520-reset.h>
> > 
> > Are you okay if I omit this hunk? My thead-dt-for-next branch is based
> > on 6.15-rc1 but thead,th1520-reset.h only exists in next until the merge
> > window.
> 
> Yeah, I'm not exactly sure how to coordinate such stuff, obviosuly it
> would be best if this chunk would make it to the 6.16, but if you think
> it would be problematic then omit it, no problem.
> 
> I will then update this patch series v3 [1] to gracefully handle lack of
> reset, as the 6.16 will not contain the required reset line for sure.
> 
> [1] - https://lore.kernel.org/all/20250414-apr_14_for_sending-v2-2-70c5af2af96c@samsung.com/

I've applied this patch to my thead-dt-for-next tree:
https://github.com/pdp7/linux/commit/1b136de08b5feca37ebdb6d28db3c9c6285aba5a

We should be able to test with the driver in next once a new next is
published (which I assume will be on Monday in Austrlia).

Thanks,
Drew