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Tue, 20 Oct 2026 08:40:28 -0700 (PDT) X-Received: by 2002:a05:622a:3cc:b0:535:dd0a:c09e with SMTP id d75a77b69052e-53646083963mr164535781cf.74.1792510828049; Tue, 20 Oct 2026 08:40:28 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-53656bcf751sm81961331cf.14.2026.10.20.08.40.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Oct 2026 08:40:27 -0700 (PDT) Message-ID: Date: Tue, 20 Oct 2026 08:40:23 -0700 X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] clk: bcm2835: register the BCM2711 GISB clock To: Nicolai Buchwitz , Stephen Boyd , Brian Masney , Jerome Brunet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Broadcom internal kernel review list , Ray Jui , Scott Branden Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrew Lunn , Stefan Wahren , Phil Elwell , netdev@vger.kernel.org, James Clark References: <20261020-devel-bcm2711-gisb-clk-v1-0-a1728724d0f8@tipi-net.de> <20261020-devel-bcm2711-gisb-clk-v1-2-a1728724d0f8@tipi-net.de> Content-Language: en-US, fr-FR From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 10/20/26 07:58, Nicolai Buchwitz wrote: > The generator at CM offset 0x1d8 is not in any documentation I could > find, but the firmware calls it gisb and runs it at 200 MHz off > PLLD_PER with a 3.75 divider. GISB is the register bus of the STB > peripherals, and on BCM2711 the GENET MDIO controller clocks its MDC > from it. mdio-bcm-unimac wants that rate to work out the MDC period. > > Mark it critical. The firmware enables it at boot and nothing in Linux > owns it, so it must never be gated. > > Checked on a Raspberry Pi CM4 by moving the divider at runtime, the > MDIO busy time follows it. > > Signed-off-by: Nicolai Buchwitz Reviewed-by: Florian Fainelli > --- > drivers/clk/bcm/clk-bcm2835.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c > index 118df86d717c6..bc1de20c7e00e 100644 > --- a/drivers/clk/bcm/clk-bcm2835.c > +++ b/drivers/clk/bcm/clk-bcm2835.c > @@ -117,6 +117,8 @@ > #define CM_EMMCDIV 0x1c4 > #define CM_EMMC2CTL 0x1d0 > #define CM_EMMC2DIV 0x1d4 > +#define CM_GISBCTL 0x1d8 > +#define CM_GISBDIV 0x1dc Yes, those names are correct and accurate here. -- Florian