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Fri, 4 Oct 2024 11:36:01 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 193.8.40.94) smtp.mailfrom=leica-geosystems.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=leica-geosystems.com; Received-SPF: Pass (protection.outlook.com: domain of leica-geosystems.com designates 193.8.40.94 as permitted sender) receiver=protection.outlook.com; client-ip=193.8.40.94; helo=hexagon.com; pr=C Received: from hexagon.com (193.8.40.94) by DU2PEPF00028D06.mail.protection.outlook.com (10.167.242.166) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8026.11 via Frontend Transport; Fri, 4 Oct 2024 11:36:00 +0000 Received: from aherlnxbspsrv01.lgs-net.com ([10.60.34.116]) by hexagon.com with Microsoft SMTPSVC(10.0.17763.1697); Fri, 4 Oct 2024 13:36:00 +0200 From: Catalin Popescu To: amitkumar.karwar@nxp.com, neeraj.sanjaykale@nxp.com, marcel@holtmann.org, luiz.dentz@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, p.zabel@pengutronix.de Cc: linux-bluetooth@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, m.felsch@pengutronix.de, bsp-development.geo@leica-geosystems.com, Catalin Popescu Subject: [PATCH 2/2] Bluetooth: btnxpuart: implement powerup sequence. 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Add support for power supply and reset and enforce powerup sequence: 1. apply power supply 2. deassert reset/powerdown Signed-off-by: Catalin Popescu --- drivers/bluetooth/btnxpuart.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c index 4f493be763b8..e58e7ac7999f 100644 --- a/drivers/bluetooth/btnxpuart.c +++ b/drivers/bluetooth/btnxpuart.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include #include @@ -188,6 +190,7 @@ struct btnxpuart_dev { struct ps_data psdata; struct btnxpuart_data *nxp_data; + struct reset_control *pdn; }; #define NXP_V1_FW_REQ_PKT 0xa5 @@ -1458,6 +1461,7 @@ static int nxp_serdev_probe(struct serdev_device *serdev) { struct hci_dev *hdev; struct btnxpuart_dev *nxpdev; + int err; nxpdev = devm_kzalloc(&serdev->dev, sizeof(*nxpdev), GFP_KERNEL); if (!nxpdev) @@ -1485,6 +1489,16 @@ static int nxp_serdev_probe(struct serdev_device *serdev) crc8_populate_msb(crc8_table, POLYNOMIAL8); + nxpdev->pdn = devm_reset_control_get_optional_shared(&serdev->dev, NULL); + if (IS_ERR(nxpdev->pdn)) + return PTR_ERR(nxpdev->pdn); + + err = devm_regulator_get_enable(&serdev->dev, "vcc"); + if (err) { + dev_err(&serdev->dev, "Failed to enable vcc regulator\n"); + return err; + } + /* Initialize and register HCI device */ hdev = hci_alloc_dev(); if (!hdev) { @@ -1492,6 +1506,8 @@ static int nxp_serdev_probe(struct serdev_device *serdev) return -ENOMEM; } + reset_control_deassert(nxpdev->pdn); + nxpdev->hdev = hdev; hdev->bus = HCI_UART; @@ -1509,6 +1525,7 @@ static int nxp_serdev_probe(struct serdev_device *serdev) if (hci_register_dev(hdev) < 0) { dev_err(&serdev->dev, "Can't register HCI device\n"); + reset_control_assert(nxpdev->pdn); hci_free_dev(hdev); return -ENODEV; } @@ -1540,6 +1557,7 @@ static void nxp_serdev_remove(struct serdev_device *serdev) } ps_cleanup(nxpdev); hci_unregister_dev(hdev); + reset_control_assert(nxpdev->pdn); hci_free_dev(hdev); }