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a=ed25519-sha256; t=1790091133; l=1681; i=shashank.maurya@oss.qualcomm.com; s=20260828; h=from:subject:message-id; bh=QWiYTLoT7AkiN37vBI/AE7LlJlRi/CqB8G17hwaEjjU=; b=oQQWORenSVY+VYcyM+kJov0+Ffqr2lgTDDLrH9fI2K9UIJo07yqAwPyOpFgNw1oORFzYPjuPa JvGHfCS+ClJDQhFfizHLxJlmJo+wDZuKHJTi9TEw5xsD0AHaZuU6raB X-Developer-Key: i=shashank.maurya@oss.qualcomm.com; a=ed25519; pk=xld72d+QYBwDMDcn3+QLCb5AUsj/D0j8klGIuxWd860= X-Proofpoint-ORIG-GUID: ZcLDJtrVJlttrUmc-FLViYVJ-ggdyJzi X-Proofpoint-GUID: ZcLDJtrVJlttrUmc-FLViYVJ-ggdyJzi X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIyMDIyNiBTYWx0ZWRfX3y5a3QK1yu1W 3sh327irP8ImCnUySMJkS/yRJQPudA0PXuYQlzytGQDu5cwL9zkQ0J6abwkoYX6RhCF7Yg8FBFr IEhkFgwlRJd82tY62cE7zQ1iYEa+5eU= X-Authority-Analysis: v=2.4 cv=NKBAaE6g c=1 sm=1 tr=0 ts=6ab29f8c cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=RYO69U5GnIJllgjd4B4A:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIyMDIyNiBTYWx0ZWRfX/yyaO2P+87AW G/0sQRSnJaSoF+crFml5ltxfURq9oHvW8sTyvCOvi4wk/PL+cT6IMUf846hpdbQcMivHrocWZYW lItArVgSjWd6vuH3bVoVlt2E86PewraxPS3nukUaqkcXSwCJ6fa1Oe9UxJ/Ytk7FowaPhNTxJCX LBwwarRUOogIG4Be9p2wCfnbdi53TORA2bzfXsdy0f87f8TsXogjEtDvt2E6dTxzkDrmQxul9BB L/tHULdQMoOC/xu+YbeP39XRwiXkJ4XPbYtABlmT5GZdv22kAdBA7Ce/jnrG6JjSEju84UX24jU zOr8P081IdK1ydvNBgx78NsUU2UUSpN56m7BrTXNCm0DQtAb06qqzh45fTYmbgX4wWDz1tQtdKx 6NmxU6jHF9R8GqxQ3FmiVlSy+XDO9op+n2N0+nSLBsfXporNA8dMDJyqjuYXO9XZA6YhN5dZvKZ tQnRbDmO22o+CceF9GQ== 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=2026-09-22_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 suspectscore=0 adultscore=0 malwarescore=0 clxscore=1015 phishscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609220226 The Raspberry Pi 7" touchscreen panel V2 MCU is powered from an external power rail which has to be enabled before any I2C register access is attempted. Use devm_regulator_get() to obtain the vcc supply and enable it at the start of probe. devm_regulator_get() returns a dummy regulator when the supply is not described in the device tree, so device trees without a vcc-supply property keep working as before. Signed-off-by: Shashank Maurya --- drivers/regulator/rpi-panel-v2-regulator.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/regulator/rpi-panel-v2-regulator.c b/drivers/regulator/rpi-panel-v2-regulator.c index 30b78aa75ee3..e54d675962e7 100644 --- a/drivers/regulator/rpi-panel-v2-regulator.c +++ b/drivers/regulator/rpi-panel-v2-regulator.c @@ -11,6 +11,7 @@ #include #include #include +#include /* I2C registers of the microcontroller. */ #define REG_ID 0x01 @@ -66,10 +67,21 @@ static int rpi_panel_v2_i2c_probe(struct i2c_client *i2c) .parent = &i2c->dev, .reg_set_base = REG_POWERON, }; + struct regulator *vcc; struct regmap *regmap; struct pwm_chip *pc; int ret; + vcc = devm_regulator_get(&i2c->dev, "vcc"); + if (IS_ERR(vcc)) + return dev_err_probe(&i2c->dev, PTR_ERR(vcc), + "Failed to get vcc supply\n"); + + ret = regulator_enable(vcc); + if (ret) + return dev_err_probe(&i2c->dev, ret, + "Failed to enable vcc supply\n"); + pc = devm_pwmchip_alloc(&i2c->dev, 1, 0); if (IS_ERR(pc)) return PTR_ERR(pc); -- 2.34.1