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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aac0e898689sm1875427466b.78.2025.01.03.04.27.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Jan 2025 04:27:52 -0800 (PST) Message-ID: Date: Fri, 3 Jan 2025 13:27:48 +0100 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 v8 4/5] arm64: dts: qcom: Add CMN PLL node for IPQ9574 SoC To: Luo Jie , Bjorn Andersson , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, quic_kkumarcs@quicinc.com, quic_suruchia@quicinc.com, quic_pavir@quicinc.com, quic_linchen@quicinc.com, quic_leiwei@quicinc.com, bartosz.golaszewski@linaro.org, srinivas.kandagatla@linaro.org References: <20250103-qcom_ipq_cmnpll-v8-0-c89fb4d4849d@quicinc.com> <20250103-qcom_ipq_cmnpll-v8-4-c89fb4d4849d@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20250103-qcom_ipq_cmnpll-v8-4-c89fb4d4849d@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: fhigX6wvjt5VPY1OUAsIK6TmMQ5FNweQ X-Proofpoint-ORIG-GUID: fhigX6wvjt5VPY1OUAsIK6TmMQ5FNweQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=987 mlxscore=0 malwarescore=0 adultscore=0 suspectscore=0 phishscore=0 spamscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501030110 On 3.01.2025 8:31 AM, Luo Jie wrote: > The CMN PLL clock controller allows selection of an input clock rate > from a defined set of input clock rates. It in-turn supplies fixed > rate output clocks to the hardware blocks that provide the ethernet > functions such as PPE (Packet Process Engine) and connected switch or > PHY, and to GCC. > > The reference clock of CMN PLL is routed from XO to the CMN PLL through > the internal WiFi block. > .XO (48 MHZ or 96 MHZ)-->WiFi (multiplier/divider)-->48 MHZ to CMN PLL. > > The reference input clock from WiFi to CMN PLL is fully controlled by > the bootstrap pins which select the XO frequency (48 MHZ or 96 MHZ). > Based on this frequency, the divider in the internal Wi-Fi block is > automatically configured by hardware (1 for 48 MHZ, 2 for 96 MHZ), to > ensure output clock to CMN PLL is 48 MHZ. > > Signed-off-by: Luo Jie > --- Reviewed-by: Konrad Dybcio Konrad