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Wed, 09 Sep 2026 10:08:43 -0700 (PDT) Received: from localhost ([188.216.77.92]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49d26c1bfc1sm5185045e9.4.2026.09.09.10.08.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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: linux-kernel@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=GKk41ONK c=1 sm=1 tr=0 ts=6aa1929d cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=WpTaRW6qxYHRGzLzQsVYzg==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=Tc_FYgHOodJxOJMde3UA:9 a=CjuIK1q_8ugA:10 a=eESnzHPFhmDI2KvGUDgA:9 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-ORIG-GUID: Rwil0yK2fjyi2HX7T0NldcyC8X8fFrAW X-Proofpoint-GUID: Rwil0yK2fjyi2HX7T0NldcyC8X8fFrAW X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDE5MSBTYWx0ZWRfX1BJBJH5YuuVD 5QN95xFIsmogN8Djy3aT2a+IKej3drvJL3rN6gWAfurVDMiHop6glqipwUFzI5BrVADa+D9v50L C62VMpbcrM40E1XwIFVEMHsV3RvuidQ= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDE5MSBTYWx0ZWRfX+LYDudRE9xBw VNfhRAmhalb3DNzXyndTJB1y0mZyg0St0XMmMrENDdu3kPeIDQ+5VqLEm+KYVmjHOLnXDA52d10 cZRSR3FAJlEyku8YsZm73qoZMZ7d//lwADKvD6jcpiUmQG2/6Qw3cd7jFuBXuZrhHAAn1Xos/kn uyE8mIOrBwRVAjwV1EoGC2zr6PKyTUEXKL3fH8S163L9HUN1mHVUO/exiNODAaNRolOYAXHBOCo dBvLxIviuisKlL0bFNd6GNHJIyDjMdvG/7dFXhHygCGch/9QEEmrSJY/9BUGUYsIy59ltcoX1DS hg9gUsXM+5QZ0mgm36uTRWSY+UlRBAwoX0uy5tTgNV3PlLW2BkFPzQwBlmmbI+8/ENO/6qqN7Ko a0n1j0GKbm7h0vvtexII6x307iz/mbYSwU/lsOYdfIyREQvX7qJSydbZaDJCNFBEhzy49j4DddU 8W7myFgcoqcO4X+0blQ== 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 lowpriorityscore=0 impostorscore=0 bulkscore=0 spamscore=0 clxscore=1015 suspectscore=0 phishscore=0 priorityscore=1501 adultscore=0 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--