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Fri, 04 Sep 2026 07:35:16 -0700 (PDT) Date: Fri, 4 Sep 2026 16:35:15 +0200 From: Lorenzo Bianconi To: Bjorn Helgaas Cc: Bjorn Helgaas , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chaitanya Chundru , Linus Walleij , Bartosz Golaszewski , Bjorn Andersson , Konrad Dybcio , Michael Walle , Alex Elder , Daniel Thompson , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: Re: [PATCH v2 4/5] PCI/pwrctrl: tc9563: switch per-port reset to GPIO descriptor API Message-ID: References: <20260903-pci-tc9563-aux-v2-4-34c625b542c1@oss.qualcomm.com> <20260903220311.GA2250435@bhelgaas> Precedence: bulk X-Mailing-List: linux-pci@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="lE5DYGO/JfD+FQa1" Content-Disposition: inline In-Reply-To: <20260903220311.GA2250435@bhelgaas> X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA0MDEzMiBTYWx0ZWRfXym3GoK5cTPec C0vemqd8hm11jN1/vCkq3WDryJkAgseWFrLtO03vrUrvIMZ/o6sgik1i9xZw4H/9tfWcRpq8Lf4 W5mMUdtksBdis80wyPRybkL/p5hQHyg= X-Authority-Analysis: v=2.4 cv=eovvCIpX c=1 sm=1 tr=0 ts=6a9ad728 cx=c_pps a=P2rfLEam3zuxRRdjJWA2cw==:117 a=WpTaRW6qxYHRGzLzQsVYzg==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8 a=OhhHAVtvP0aG5I1CcfYA:9 a=CjuIK1q_8ugA:10 a=wkYq-V80zuO17UhYMvoA:9 a=ODZdjJIeia2B_SHc_B0f:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA0MDEzMiBTYWx0ZWRfX+CPyIGBGCkE8 JhgVOM9wx3Zq2gZMDuKicpv8xXt/0UR8FbAOhvntcRRMmlEXcsjNGNdAb/vHoIt83hl4iaZEcLB 653FRqHhdeyKuernU86VVA0ZiV0Sc1171MqIwo6Qx5y5Oe8DiEE0HbXmGss6P5Y5+tnYCO7Yz4I ma85PHs+iOwLvf1PMFZxJISd7lEobUhw5fbd5IHfQwIQm0lTfVocPUZlQ4tNoPHkLyB34W49jSh vSCe147jkwo1YwHYI7KYIskD8+SsF+V32V13VF2Xq42cchJlX/jaiwv4xTDK89RkugL22pye46x NITURRCy7Hn2WKZ++j1bYLMEqhKwb7XrqzHGzAYHaVFKeqHXDLzjSNTjXT39+gJXnyFQZ9yqoNB y7D7n4q99io84Qn1a/cLh0OkDviCHaALFmFUjMoGZpXDiQGNMUr0wqOJs0BdLD7xcBlWk5cVlff 7V0J5QE6VCgY4vBH/Vw== X-Proofpoint-ORIG-GUID: 80rZrjUENOJe1iruCD4QnHp3a4Q6oHM1 X-Proofpoint-GUID: 80rZrjUENOJe1iruCD4QnHp3a4Q6oHM1 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=2026-09-04_04,2026-09-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 impostorscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609040132 --lE5DYGO/JfD+FQa1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > On Thu, Sep 03, 2026 at 09:53:00AM +0200, Lorenzo Bianconi wrote: > > Remove the local TC9563_GPIO_MASK and TC9563_GPIO_DEASSERT_BITS > > definitions, which are no longer used after switching to the GPIO > > descriptor API. > >=20 > > Replace the direct regmap-based per-port reset logic in > > assert_deassert_reset() with gpiod_direction_output() calls, falling > > back to the legacy regmap approach only when no reset-gpios DT > > property is present for a given port. > >=20 > > Add the reset GPIO pointer to struct tc9563_pwrctrl_cfg and introduce > > tc9563_pwrctrl_parse_reset_line() to look up reset-gpios from each > > PCI downstream port child node. The lookup is done lazily at the > > beginning of power_on(), returning -EPROBE_DEFER until the GPIO chip > > is registered. > >=20 > > Signed-off-by: Lorenzo Bianconi >=20 > Capitalize "Switch per-port ..." in subject. ack, I will fix it in v2. >=20 > Question below. >=20 > > --- > > drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c | 85 ++++++++++++++++++++++++= +++----- > > 1 file changed, 73 insertions(+), 12 deletions(-) > >=20 > > diff --git a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c b/drivers/pci/pwr= ctrl/pci-pwrctrl-tc9563.c > > index 6df512d78b54..09ab4718db8a 100644 > > --- a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c > > +++ b/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c > > @@ -57,9 +57,6 @@ > > #define TC9563_POWER_CONTROL 0x82b09c > > #define TC9563_POWER_CONTROL_OVREN 0x82b2c8 > > =20 > > -#define TC9563_GPIO_MASK 0xfffffff3 > > -#define TC9563_GPIO_DEASSERT_BITS 0xc /* Clear to deassert GPIO */ > > - > > #define TC9563_TX_MARGIN_MIN_UA 400000 > > =20 > > /* > > @@ -85,6 +82,7 @@ struct tc9563_pwrctrl_cfg { > > u8 nfts[2]; /* GEN1 & GEN2 */ > > bool disable_dfe; > > bool disable_port; > > + struct gpio_desc *reset; > > }; > > =20 > > #define TC9563_PWRCTL_MAX_SUPPLY 6 > > @@ -349,16 +347,40 @@ static int tc9563_pwrctrl_set_nfts(struct tc9563_= pwrctrl *tc9563, > > static int tc9563_pwrctrl_assert_deassert_reset(struct tc9563_pwrctrl = *tc9563, > > bool deassert) > > { > > - int ret, val; > > - > > - ret =3D regmap_write(tc9563->regmap, TC9563_GPIO_CONFIG, > > - TC9563_GPIO_MASK); > > - if (ret) > > - return ret; > > - > > - val =3D deassert ? TC9563_GPIO_DEASSERT_BITS : 0; > > + int i; > > + > > + for (i =3D 0; i < ARRAY_SIZE(tc9563->cfg); i++) { > > + int err; > > + > > + if (tc9563->cfg[i].reset) { > > + err =3D gpiod_direction_output(tc9563->cfg[i].reset, > > + !deassert); > > + if (err) > > + return err; > > + } else { > > + /* Fallback: legacy DTS without reset-gpios */ > > + switch (i) { > > + case TC9563_DSP1: > > + case TC9563_DSP2: > > + err =3D regmap_clear_bits(tc9563->regmap, > > + TC9563_GPIO_CONFIG, > > + BIT(i + 1)); > > + if (err) > > + return err; > > + > > + err =3D regmap_assign_bits(tc9563->regmap, > > + TC9563_RESET_GPIO, > > + BIT(i + 1), deassert); > > + if (err) > > + return err; > > + break; > > + default: > > + break; > > + } > > + } > > + } > > =20 > > - return regmap_write(tc9563->regmap, TC9563_RESET_GPIO, val); > > + return 0; > > } > > =20 > > static int tc9563_pwrctrl_parse_device_dt(struct device_node *node, > > @@ -393,6 +415,41 @@ static int tc9563_pwrctrl_parse_device_dt(struct d= evice_node *node, > > return 0; > > } > > =20 > > +static int tc9563_pwrctrl_parse_reset_line(struct tc9563_pwrctrl *tc95= 63) > > +{ > > + enum tc9563_pwrctrl_ports port =3D TC9563_USP; > > + struct device *dev =3D tc9563->pwrctrl.dev; > > + struct device_node *node =3D dev->of_node; > > + > > + for_each_child_of_node_scoped(node, child) { > > + struct tc9563_pwrctrl_cfg *cfg; > > + > > + if (!of_node_is_type(child, "pci")) > > + continue; > > + > > + if (++port >=3D TC9563_MAX) > > + break; > > + > > + cfg =3D &tc9563->cfg[port]; > > + if (cfg->reset) /* Already discovered */ > > + continue; > > + > > + cfg->reset =3D devm_fwnode_gpiod_get(dev, of_fwnode_handle(child), > > + "reset", GPIOD_ASIS, > > + NULL); > > + if (IS_ERR(cfg->reset)) { > > + int err =3D PTR_ERR(cfg->reset); > > + > > + cfg->reset =3D NULL; > > + if (err !=3D -ENOENT) > > + return dev_err_probe(dev, err, > > + "failed to get reset\n"); > > + } > > + } > > + > > + return 0; > > +} > > + > > static void tc9563_pwrctrl_adev_release(struct device *dev) > > { > > struct auxiliary_device *adev =3D to_auxiliary_dev(dev); > > @@ -480,6 +537,10 @@ static int tc9563_pwrctrl_power_on(struct pci_pwrc= trl *pwrctrl) > > struct tc9563_pwrctrl_cfg *cfg; > > int ret, i; > > =20 > > + ret =3D tc9563_pwrctrl_parse_reset_line(tc9563); > > + if (ret) > > + return ret; >=20 > Seems like this call would fit better in > tc9563_pwrctrl_parse_device_dt() since it already handles similar > properties and nothing in DT is changing. >=20 > But I guess this is because the GPIO chip may not be registered at > tc9563_pwrctrl_probe() time. Could tc9563_pwrctrl_probe() itself > return -EPROBE_DEFER? Returning it from tc9563_pwrctrl_power_on() > seems a little weird. Correct, I am not running tc9563_pwrctrl_parse_reset_line() in tc9563_pwrctrl_parse_device_dt() since GPIO chip may not be registered at moment (we need to run tc9563_pwrctrl_add_gpio_adev() first). Moreover, pwrctrl power_on() callback is running during PCI host bridge driver probe: qcom_pcie_probe() -> dw_pcie_host_init() -> qcom_pcie_host_init() -> pci_pwrctrl_power_on_devices() -> tc9563_pwrctrl_power_on() But this approach will allow us to avoid running pci_pwrctrl_destroy_device= s() in qcom_pcie_host_init() if tc9563_pwrctrl_power_on() returns -EPROBE_DEFER (e.g. if the GPIO controller has not fully probed yet). If we return -EPROBE_DEFER in tc9563_pwrctrl_probe() this kernel will destr= oy even the GPIO aux device and we need to create it again during the next attempt. Regards, Lorenzo >=20 > > ret =3D regulator_bulk_enable(ARRAY_SIZE(tc9563->supplies), > > tc9563->supplies); > > if (ret < 0) > >=20 > > --=20 > > 2.55.0 > >=20 --lE5DYGO/JfD+FQa1 Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCaprXIwAKCRA6cBh0uS2t rLQRAP9h8FPk+nSsMHWkRCkWQxLxy19w/oaZm98nYS2DUsfO8gEAihDrXGRAJoSr 716TKsf6Kj3T47+gwSkA8yhu9t+pOAg= =zJQP -----END PGP SIGNATURE----- --lE5DYGO/JfD+FQa1--