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Mon, 24 Feb 2025 06:33:15 -0800 (PST) Received: from [192.168.5.199] ([92.120.5.6]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5dece2721d9sm18891253a12.56.2025.02.24.06.33.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Feb 2025 06:33:14 -0800 (PST) Message-ID: <36451a88-bfc6-4402-8e16-890d524a9368@gmail.com> Date: Mon, 24 Feb 2025 16:42:02 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/4] arm64: dts: imx8mp: change AUDIO_AXI_CLK_ROOT freq. to 800MHz Content-Language: en-GB To: Adam Ford Cc: Abel Vesa , Peng Fan , Rob Herring , Krzysztof Kozlowski , Shawn Guo , Marek Vasut , Stephen Boyd , Shengjiu Wang , Pengutronix Kernel Team , linux-clk@vger.kernel.org, imx@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lucas Stach References: <20250221190929.31469-1-laurentiumihalcea111@gmail.com> <20250221190929.31469-5-laurentiumihalcea111@gmail.com> From: Mihalcea Laurentiu In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 21.02.2025 21:37, Adam Ford wrote: > On Fri, Feb 21, 2025 at 1:11 PM Laurentiu Mihalcea > wrote: >> From: Laurentiu Mihalcea >> >> AUDIO_AXI_CLK_ROOT can't run at currently requested 600MHz w/ its parent >> SYS_PLL1 configured at 800MHz. Configure it to run at 800MHz as some >> applications running on the DSP expect the core to run at this frequency >> anyways. This change also affects the AUDIOMIX NoC. > Unless I am missing something, the i.MX 8M Plus Applications Processor > Datasheet (rev 2.1) has a table of frequencies, and > AUDIO_AXI_CLK_ROOT is shown to be 600MHz nominal and 800MHz for > overdrive. I agree that it's likely not running at 600MHz now, but > 800MHz may be out of spec for people who are using the nominal voltage > instead of the overdrive, since overdrive requires higher voltages > than the nominal. > > adam You're right, this would not work if someone was using nominal voltage. Do you have an upstream board in mind/usecase which works with nominal voltage instead of overdrive? As far as I understood from Lucas's patch ([1]) there's no upstream board using nominal voltage? CC-ing Lucas on this as his patch ([1]) is similar to this in that they're both trying to use overdrive clock frequencies in the DTSI and I'd very much like to have some sort of consistency in the DTSI if possible. [1]: https://lore.kernel.org/imx/20250204182737.3361431-1-l.stach@pengutronix.de/