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Thu, 06 Nov 2025 07:31:11 -0800 (PST) X-Google-Smtp-Source: AGHT+IFOUzd1uTbvbHMqzgt2Y+kkpQNb+36amLdPBWT1pIua+eKBDxydfZowU9JJoXxPJtX6EG/QJQ== X-Received: by 2002:a05:6a21:3d84:b0:34f:bf12:8e27 with SMTP id adf61e73a8af0-34fbf128ea8mr8971308637.13.1762443070469; Thu, 06 Nov 2025 07:31:10 -0800 (PST) Received: from [192.168.1.3] ([182.65.157.163]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7af82205b11sm3147569b3a.45.2025.11.06.07.31.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 07:31:10 -0800 (PST) Message-ID: <9bd003e0-4600-4b5f-97d7-efefe687f358@oss.qualcomm.com> Date: Thu, 6 Nov 2025 21:01:03 +0530 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/2] usb: typec: hd3ss3220: Enable VBUS based on ID pin state To: Heikki Krogerus Cc: Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Biju Das , Dmitry Baryshkov , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251102164819.2798754-1-krishna.kurapati@oss.qualcomm.com> <20251102164819.2798754-3-krishna.kurapati@oss.qualcomm.com> Content-Language: en-US From: Krishna Kurapati PSSNV In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=AYu83nXG c=1 sm=1 tr=0 ts=690cbf40 cx=c_pps a=rz3CxIlbcmazkYymdCej/Q==:117 a=fO48qRZoIuIFQjWVjTpNpw==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=YkpnwElOSCd70Td7CIoA:9 a=QEXdDO2ut3YA:10 a=bFCP_H2QrGi7Okbo017w:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA2MDEyMiBTYWx0ZWRfXws+VVi7vLTmG lsw7T8MMj5dGfCQJcF5u92loE+GgV7+VFKdKw6WYZUda6w2PPXNKird+lD/I5Uiy7lGKiXaXi4E JdGjhZwYC3YPZ26cZoid2VO7OxhISvGf624LJr6sc3a3cWt4oM6nVN8fxQMrU7uUdHx7iQGGTip JbNufWMbH9P5Kzy0gNHajE3sbvaA9OJMMKpmIuwkfdXbCUOLSxd7dT//28nk0jlrnFzK6Qc8mCe q476jFdeUqjnkN5Hs8P4zHQCj7mTbDkE7S/lo6Wt6hqncQ4tJJgiAakU67swp13bhUnNAgs/zWV 1lNK3JOOB4lg3pFNlI5DMLJ0Nxfy+TcVNOrneIJe5mJ+gz4n8hrv9fUjzYr8urTH4jIqcGyIj1F pi65+24X96XCkh4ac47Tu5AYcU7sJg== X-Proofpoint-ORIG-GUID: ItUb-PcdaruYwf-DJUvy6hq_DlAhHnKG X-Proofpoint-GUID: ItUb-PcdaruYwf-DJUvy6hq_DlAhHnKG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-06_03,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 clxscore=1015 spamscore=0 phishscore=0 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511060122 On 11/6/2025 3:35 PM, Heikki Krogerus wrote: > Hi Krishna, > > Sun, Nov 02, 2025 at 10:18:19PM +0530, Krishna Kurapati kirjoitti: >> There is a ID pin present on HD3SS3220 controller that can be routed >> to SoC. As per the datasheet: >> >> "Upon detecting a UFP device, HD3SS3220 will keep ID pin high if VBUS is >> not at VSafe0V. Once VBUS is at VSafe0V, the HD3SS3220 will assert ID pin >> low. This is done to enforce Type-C requirement that VBUS must be at >> VSafe0V before re-enabling VBUS" >> >> Add support to read the ID pin state and enable VBUS accordingly. >> >> Signed-off-by: Krishna Kurapati >> --- >> drivers/usb/typec/hd3ss3220.c | 72 +++++++++++++++++++++++++++++++++++ >> 1 file changed, 72 insertions(+) >> >> diff --git a/drivers/usb/typec/hd3ss3220.c b/drivers/usb/typec/hd3ss3220.c >> index 3ecc688dda82..75fbda42eaf4 100644 >> --- a/drivers/usb/typec/hd3ss3220.c >> +++ b/drivers/usb/typec/hd3ss3220.c >> @@ -15,6 +15,9 @@ >> #include >> #include >> #include >> +#include >> +#include >> +#include >> >> #define HD3SS3220_REG_CN_STAT 0x08 >> #define HD3SS3220_REG_CN_STAT_CTRL 0x09 >> @@ -54,6 +57,11 @@ struct hd3ss3220 { >> struct delayed_work output_poll_work; >> enum usb_role role_state; >> bool poll; >> + >> + struct gpio_desc *id_gpiod; >> + int id_irq; >> + >> + struct regulator *vbus; >> }; >> >> static int hd3ss3220_set_power_opmode(struct hd3ss3220 *hd3ss3220, int power_opmode) >> @@ -319,6 +327,44 @@ static const struct regmap_config config = { >> .max_register = 0x0A, >> }; >> >> +static irqreturn_t hd3ss3220_id_isr(int irq, void *dev_id) >> +{ >> + struct hd3ss3220 *hd3ss3220 = dev_id; >> + int ret; >> + int id; >> + >> + if (!hd3ss3220->vbus) >> + return IRQ_HANDLED; > > If you don't need this routine unless there is a vbus regulator, then > don't register it at all if there is no vbus regulator. > Will move vbus check before id retrieval in probe and ignore retrieval of ID if vbus is absent. >> + id = hd3ss3220->id_gpiod ? gpiod_get_value_cansleep(hd3ss3220->id_gpiod) : 1; > > You still don't need to check for hd3ss3220->id_gpiod - this function > will not get called unless it's there. > > if (gpiod_get_value_cansleep(hd3ss3220->id_gpiod)) > ret = regulator_disable(hd3ss3220->vbus); > else > ret = regulator_enable(hd3ss3220->vbus); > ACK. > Note: > > If you are concerned that the reference to the id_gpiod may be > released before this routine is unregistered, then that condition will > not help. The hd3ss3220->id_gpiod member is _not_ NULL after the > reference is released. > > If you need a specific order in which the references are released, > then you can't use the resource management (devm_*) to automate things > for you. There is no specific order. So the id part I can keep it intact except for checking presence of ID pin in interrupt handler. > >> + if (!id) { >> + ret = regulator_enable(hd3ss3220->vbus); >> + if (ret) >> + dev_err(hd3ss3220->dev, "enable vbus regulator failed\n"); >> + } else { >> + regulator_disable(hd3ss3220->vbus); >> + } >> + >> + return IRQ_HANDLED; >> +} >> + >> +static int hd3ss3220_get_vbus_supply(struct hd3ss3220 *hd3ss3220, >> + struct fwnode_handle *connector) >> +{ >> + int ret = 0; >> + >> + hd3ss3220->vbus = devm_of_regulator_get_optional(hd3ss3220->dev, >> + to_of_node(connector), >> + "vbus"); >> + if (PTR_ERR(hd3ss3220->vbus) == -ENODEV) >> + hd3ss3220->vbus = NULL; >> + else if (IS_ERR(hd3ss3220->vbus)) >> + ret = PTR_ERR(hd3ss3220->vbus); > > So the regulator API's optional functions return -ENODEV instead of NULL :( > In any case, don't double assign the member. Use local variable. > > struct regulator *vbus; > > vbus = devm_of_regulator_get_optional(... > if (IS_ERR(vbus) && vbus != ERR_PTR(-ENODEV)) > return PTR_ERR(vbus); > > hd3ss3220->vbus = vbus; > return 0; > > I don't think you need this function - just do that in the probe function. > ACK. Regards, Krishna,