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Wed, 09 Sep 2026 10:08:42 -0700 (PDT) Date: Wed, 9 Sep 2026 19:08:41 +0200 From: Lorenzo Bianconi To: Mohd Ayaan Anwar Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrew Davis , Andrew Lunn , Heiner Kallweit , Russell King , Richard Cochran , Bjorn Andersson , Konrad Dybcio , Alexandre Torgue , Giuseppe Cavallaro , Jose Abreu , Maxime Chevallier , Maxime Coquelin , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH net-next v2 2/9] net: phy: dp83867: add regulator supply management Message-ID: References: <20260908-shikra_ethernet-v2-0-bbe3389d0652@oss.qualcomm.com> <20260908-shikra_ethernet-v2-2-bbe3389d0652@oss.qualcomm.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="c9IX8H6zKLOh4Z/N" Content-Disposition: inline In-Reply-To: <20260908-shikra_ethernet-v2-2-bbe3389d0652@oss.qualcomm.com> X-Authority-Analysis: v=2.4 cv=bd1bluPB c=1 sm=1 tr=0 ts=6aa1929d cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=WpTaRW6qxYHRGzLzQsVYzg==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=Tc_FYgHOodJxOJMde3UA:9 a=CjuIK1q_8ugA:10 a=eESnzHPFhmDI2KvGUDgA:9 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDE5MSBTYWx0ZWRfXx4sFbmblurfB Y1hWze/7FEchVBOOEfUt2DiAR9bRnsk8ilQdsUs83+805tVF2kg/X/9EsXw/g3r5PDpjv7X6V28 6g7HoQi6focQomOun18T3kyG8LToKmQhHVu2FN6d0elmlg/qBPB4AbBOo5WDQtN+LvcQUmrFVZr 5xGmFLQfxyAqsJIhJZp3ihhOmbve0qEQzY714QzWIxnV2ELHkIdZvqjO2Za6fmQSirCYpy4lV7F nS7JiqXBYKE12L3Sv7sKGwXrm38qCc20Fo2BcPjS1A4xVqZkxO+JCjc/WYe+LQ5bqebiEeOZ9wd C1APeAKD+hhKWJvEnVctFETDAAwXZhgWQ5CZ8e0nIa9lsXFIoxWPFuIL0pWFSKfey/cC5Uhw5H4 ymExgsVhh6o6huyCBkolZBevtDRDijOSwfJlkn4MZqrwtChoV9evn15Etkl0ZH/YNc6o1Vovg92 IYYKL/llbHIsxwWnkoA== X-Proofpoint-ORIG-GUID: YhIexOs76TroMOGBtoEdgcpHlPux5hRe X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDE5MSBTYWx0ZWRfX6YXuvbcREhKk xpbD4UVk9C2OgGpo7OMohdw9avHtSKys4zuhRdoW5YOfWP1nmZ56dKb47rmDoBzZetgRjqHG8gm lzSkEmvhfaHtTyjYdE0xrxzT0qYhLag= X-Proofpoint-GUID: YhIexOs76TroMOGBtoEdgcpHlPux5hRe 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=2026-09-08_03,2026-09-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 spamscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 impostorscore=0 phishscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090191 --c9IX8H6zKLOh4Z/N Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > Some embedded board designs use GPIO-controlled regulators for the > DP83867 power rails. Add dp83867_power_on() to enable all four supply > domains at probe time. Absent supplies are silently skipped, so boards > that do not describe them are unaffected. >=20 > When any supply is newly enabled the driver sleeps for 200 ms before > returning. This satisfies the post power-up stabilisation requirement > mentioned in section 6.6 of the DP83867E/IS/CS datasheet. >=20 > Signed-off-by: Mohd Ayaan Anwar Acked-by: Lorenzo Bianconi > --- > drivers/net/phy/dp83867.c | 33 +++++++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) >=20 > diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c > index 88255e92b4cdbd6da2e2c1d10f9c72348d28dbc3..dbeee7cad6f0cbfeb127bfd28= f43ee2a16c78879 100644 > --- a/drivers/net/phy/dp83867.c > +++ b/drivers/net/phy/dp83867.c > @@ -15,6 +15,7 @@ > #include > #include > #include > +#include > =20 > #include > =20 > @@ -719,9 +720,41 @@ static int dp83867_resume(struct phy_device *phydev) > return 0; > } > =20 > +static int dp83867_power_on(struct phy_device *phydev) > +{ > +#ifdef CONFIG_OF > + static const char * const supply_names[] =3D { > + "vdda-2p5", "vdd-1p0", "vdda-1p8", "vddio", > + }; > + struct device *dev =3D &phydev->mdio.dev; > + u32 count =3D 0; > + int i, ret; > + > + for (i =3D 0; i < ARRAY_SIZE(supply_names); i++) { > + ret =3D devm_regulator_get_enable_optional(dev, supply_names[i]); nit: I guess it easier to read if you do something like: if (ret !=3D -ENODEV) return dev_err_probe(); count +=3D !ret; > + if (!ret) > + count++; > + else if (ret !=3D -ENODEV) > + return dev_err_probe(dev, ret, > + "failed to enable %s supply\n", > + supply_names[i]); > + } > + > + /* Datasheet section 6.6 suggests a 200ms post power-up stabilization */ > + if (count) > + fsleep(200000); > +#endif > + return 0; > +} > + > static int dp83867_probe(struct phy_device *phydev) > { > struct dp83867_private *dp83867; > + int ret; > + > + ret =3D dp83867_power_on(phydev); > + if (ret) > + return ret; > =20 > dp83867 =3D devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867), > GFP_KERNEL); >=20 > --=20 > 2.34.1 >=20 >=20 --c9IX8H6zKLOh4Z/N Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCaqGSmQAKCRA6cBh0uS2t rNquAQC5wJNUN95Ep26s8XtzLNRj4JBV+qFthkyWqQAnIRtBTgEA+pcM+Wip2fRN UHB7AACiMwvDdjPTHaF37W2hm07h/g0= =eyly -----END PGP SIGNATURE----- --c9IX8H6zKLOh4Z/N--