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Sat, 17 Oct 2026 01:12:14 -0700 (PDT) Date: Sat, 17 Oct 2026 13:42:06 +0530 From: Mohd Ayaan Anwar To: Andrew Lunn Cc: Alex Elder , Lorenzo Bianconi , andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, hkallweit1@gmail.com, linux@armlinux.org.uk, Daniel Thompson , ansuelsmth@gmail.com, donggeunyoo.kernel@gmail.com, devicetree@vger.kernel.org, netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next v2 2/2] net: phy: qcom: qca808x: Add regulator management Message-ID: References: <20261015143849.483339-1-elder@riscstar.com> <20261015143849.483339-3-elder@riscstar.com> <4fc165eb-b57d-41f8-b7b9-c9fe433d866c@riscstar.com> <1af4e7a8-adb9-41bd-8841-61180b284470@lunn.ch> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE3MDAzMiBTYWx0ZWRfX4Jj+57bUa5ie Eu9hYTifAKXemXmuFVDd0Bkch4Bs4eqAMELjxjtpK1szD0jhCRlLsMFO4d0qVOFbp3YQmnekbg/ Q4Wx8b/KICSTBqT7I96C4xqY59nK768= X-Proofpoint-GUID: 5Ea8M_gWxNdZzvDh67Qn1hXctaNnmGJu X-Proofpoint-ORIG-GUID: 5Ea8M_gWxNdZzvDh67Qn1hXctaNnmGJu X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE3MDAzMiBTYWx0ZWRfXxv7BJLIeFgfe SgAYflnC4+8/HxOVE7HR018Coc6wfhPe75abRT8JbSAFByYPldgWvO458ZZ6R0EkBOgIfINLfMK 4+v569Mt+cKidC8/jZ2AL3Fo+htcz/TXixin1w0DP+9Ej8QX33RExqQk0lE3ibl9cbmBkAOrFCD InVnozv1+LsSYgkttnuqiJSgT/Nkz1Kh2crkzYE5oblToy8S0deopmWu26QEToSvi7VHnTeKUWP tv4ed/J5ijQQhQOerlO/KkZnE96gddF/UHa73SkGcKLxQEjD2AB0QjWzOUFIJ94sAYHZMokt2tT piBtGakVIHEtbkAmbjvAHdQbeMgApUfFCpdMcv5pTTPgaURy6zt+KI6009n6HBHTjG/gwm2oI+d 4Y9ooAO3rqvu2sfTQY774SE+5e5tfTyoWgUxvcfuNjd7sPiCevwHw3np5G+Ew///PkczS9IDCQ1 03pidqwx7Y8CUpGv9XA== X-Authority-Analysis: v=2.4 cv=PMeaavqC c=1 sm=1 tr=0 ts=6ad32de0 cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=xcn7ZbKIuaFRTQb2Q6EA:9 a=CjuIK1q_8ugA:10 a=scEy_gLbYbu1JhEsrz4S:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-17_02,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 spamscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610170032 On Fri, Oct 16, 2026 at 05:17:20PM +0200, Andrew Lunn wrote: > > I was going to share a text version of the power-up diagram given in > > this PHY's datasheet. This might help. > > > > Power-Up Sequence > > > > 1. DVDD asserted > > | > > |<-------- 10 ms -------->| (required for external power) > > | > > 2. DVDD18 / AVDD18 asserted > > > > 3. VDD1P25 asserted > > | > > |<-------- 0.2 ms ------->| (required for LDO to settle) > > | > > 4. VDD_LDO asserted > > > > 5. AVDD asserted > > | > > |<--------- 2 ms -------->| (required for XTL to oscillate) > > | > > 6. Crystal 50 MHz starts oscillating > > > > 7. PAD reset deasserted > > | > > |<------- 10 ms --------->| (deglitch time) > > > > Are these supposed to be staggered? Or can you turn them all on at > once. Its a confusing diagram but from what I gather: there's no delay required between 1., 3., and 5. They are shown as partially overlapping. This might be a better representation of the diagram: DVDD ..../------------------------------------------------- |<--------- 10 ms ----------->| | (external power) | DVDD18/AVDD18 ................................../------------------- VDD1P25 ............../--------------------------------------- |<0.2 ms>| | LDO settling VDD_LDO ......................../----------------------------- AVDD ......................../----------------------------- |< 2 ms >| | crystal startup Crystal 50 MHz ........................................../\/\/\/\/\/ PAD reset ..................................................../--- |<10 ms>| deglitch > > 23ms does seem like the worst case. > Yes, I thought that 23ms would be a safe value after looking at the diagram. Ayaan