From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Billy Tsai <billy_tsai@aspeedtech.com>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Joel Stanley" <joel@jms.id.au>,
"Andrew Jeffery" <andrew@codeconstruct.com.au>,
"Ryan Chen" <ryan_chen@aspeedtech.com>,
linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/3] iio: adc: aspeed: Fix SCU lookup for multi-SCU AST2700
Date: Fri, 2 Oct 2026 12:23:33 +0300 [thread overview]
Message-ID: <ar94FZ2kEJZzJJb3@ashevche-desk.local> (raw)
In-Reply-To: <20261001-ast27xx-adc-upstream-v2-0-2f9c15cc0064@aspeedtech.com>
On Thu, Oct 01, 2026 at 05:50:35PM +0800, Billy Tsai wrote:
> The ADC's reference-voltage trimming data lives in a SCU register. The
> driver has always located that SCU with a global, name-based
> device-tree search, which works as long as a platform only has a
> single node named "syscon". AST2700 splits its SCU into two
> instances, syscon0 and syscon1, that share that same node name and
> differ only by label and unit address, so the lookup always resolves
> to syscon0 even when the ADC's trimming data lives in syscon1.
>
> This series adds an explicit "aspeed,trim-syscon" phandle property so multi-SCU
> platforms can point the ADC at the right SCU, keeps the existing
> global lookup as a fallback for single-SCU platforms and already
> deployed device trees, and wires the new property up on AST2700.
>
> Patch summary:
> 1. dt-bindings: iio: adc: Add syscon property for multi-SCU SoCs
> 2. iio: adc: aspeed: Use syscon phandle for trimming data when available
> 3. arm64: dts: aspeed: Add syscon phandle to AST2700 ADC nodes
>
> Assisted-by: Claude:claude-sonnet-5
Assisted-by: LLM
(as documented)
--
With Best Regards,
Andy Shevchenko
prev parent reply other threads:[~2026-10-02 9:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 9:50 Billy Tsai
2026-10-01 9:50 ` [PATCH v2 1/3] dt-bindings: iio: adc: Add syscon property for multi-SCU SoCs Billy Tsai
2026-10-02 9:03 ` Krzysztof Kozlowski
2026-10-02 9:15 ` Joshua Crofts
2026-10-01 9:50 ` [PATCH v2 2/3] iio: adc: aspeed: Use syscon phandle for trimming data when available Billy Tsai
2026-10-02 8:34 ` Andy Shevchenko
2026-10-01 9:50 ` [PATCH v2 3/3] arm64: dts: aspeed: Add syscon phandle to AST2700 ADC nodes Billy Tsai
2026-10-02 9:23 ` Andy Shevchenko [this message]
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