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

From: Drew Fustini <drew@pdp7.com>
To: Michal Wilczynski <m.wilczynski@samsung.com>
Cc: mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org,
	krzk+dt@kernel.org, conor+dt@kernel.org, guoren@kernel.org,
	wefu@redhat.com, jassisinghbrar@gmail.com,
	paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, frank.binns@imgtec.com,
	matt.coster@imgtec.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com,
	simona@ffwll.ch, ulf.hansson@linaro.org, jszhang@kernel.org,
	p.zabel@pengutronix.de, m.szyprowski@samsung.com,
	linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH v5 20/21] riscv: dts: thead: Introduce reset controller node
Date: Fri, 25 Apr 2025 12:16:47 -0700	[thread overview]
Message-ID: <aAvfn2mq0Ksi8DF2@x1> (raw)
In-Reply-To: <81e53e3a-5873-44c7-9070-5596021daa42@samsung.com>

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@samsung.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

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