From: Aurelien Jarno <aurelien@aurel32.net>
To: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Cc: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
Brian Masney <bmasney@redhat.com>, Yixun Lan <dlan@kernel.org>,
Inochi Amaoto <inochiama@outlook.com>,
Alex Elder <elder@riscstar.com>, Haylen Chu <heylenay@4d2.org>,
linux-clk@vger.kernel.org, linux-riscv@lists.infradead.org,
spacemit@lists.linux.dev, linux-kernel@vger.kernel.org,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>
Subject: Re: [PATCH v2] clk: spacemit: k3: add 1.8 GHz PLL5 and PLL8 rates
Date: Sun, 30 Aug 2026 19:25:04 +0200 [thread overview]
Message-ID: <apRncBmtm7w0Emwf@aurel32.net> (raw)
In-Reply-To: <20260810-k3-pll5-pll8-1800mhz-v2-1-aabff510a797@linux.spacemit.com>
Hi Troy,
On 2026-08-10 16:46, Troy Mitchell wrote:
> K3 boot firmware configures the C2 and C3 CPU clock domains at
> 1.8 GHz. PLL5 feeds C2 and PLL8 feeds C3, but their rate tables
> currently contain only the 2 GHz overclocking operating point.
>
> Add the nominal 1.8 GHz configuration as the first entry in both
> tables. This lets determine_rate() and set_rate() select the firmware
> operating point while retaining 2 GHz as a supported overclocking rate.
>
> Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> ---
> The related U-Boot change is available at:
> https://github.com/spacemit-com/uboot-2022.10/commit/fb95cf3d848b771c61b5a1b3e5cbbee223faf352
> ---
> Changes in v2:
> - Drop "clk: spacemit: re-enable PLLs after init"; the PLL init issue
> will be handled in a separate series.
> - Send the K3 PLL5 and PLL8 1.8 GHz rate-table update as a standalone
> patch.
> - Clarify that 1.8 GHz is nominal and 2 GHz is an overclocking rate.
> - Link to v1: https://patch.msgid.link/20260804-k3-pll5-pll8-1800mhz-v1-0-a3a75866ce32@linux.spacemit.com
This make sense and looks good:
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
I wonder if it should be backported to stable, as users will deploy
newer firmware.
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurelien@aurel32.net http://aurel32.net
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next prev parent reply other threads:[~2026-08-30 17:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-10 8:46 [PATCH v2] clk: spacemit: k3: add 1.8 GHz PLL5 and PLL8 rates Troy Mitchell
2026-08-30 17:25 ` Aurelien Jarno [this message]
2026-08-31 3:06 ` Troy Mitchell
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