From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: [PATCH v1 4/4] Bluetooth: btmtkuart: add an implementation for clock osc property Date: Sun, 2 Jun 2019 09:04:17 +0800 Message-ID: <1559437457-26766-5-git-send-email-sean.wang@mediatek.com> References: <1559437457-26766-1-git-send-email-sean.wang@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1559437457-26766-1-git-send-email-sean.wang@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, mark.rutland@arm.com, marcel@holtmann.org, johan.hedberg@gmail.com Cc: devicetree@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Sean Wang List-Id: devicetree@vger.kernel.org From: Sean Wang Some board requires explicitily control external osscilator via GPIO. So, add an implementation of a clock property for an external oscillator to the device. Signed-off-by: Sean Wang --- drivers/bluetooth/btmtkuart.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c index 1257149cfdc4..e11169ad8247 100644 --- a/drivers/bluetooth/btmtkuart.c +++ b/drivers/bluetooth/btmtkuart.c @@ -115,8 +115,9 @@ struct btmtk_hci_wmt_params { struct btmtkuart_dev { struct hci_dev *hdev; struct serdev_device *serdev; - struct clk *clk; + struct clk *clk; + struct clk *osc; struct regulator *vcc; struct gpio_desc *reset; struct gpio_desc *boot; @@ -912,6 +913,12 @@ static int btmtkuart_parse_dt(struct serdev_device *serdev) return err; } + bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); + if (IS_ERR(bdev->osc)) { + err = PTR_ERR(bdev->osc); + return err; + } + bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", GPIOD_OUT_LOW); if (IS_ERR(bdev->boot)) { @@ -1006,6 +1013,10 @@ static int btmtkuart_probe(struct serdev_device *serdev) set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); if (btmtkuart_is_standalone(bdev)) { + err = clk_prepare_enable(bdev->osc); + if (err < 0) + return err; + if (bdev->boot) { gpiod_set_value_cansleep(bdev->boot, 1); } else { @@ -1017,8 +1028,10 @@ static int btmtkuart_probe(struct serdev_device *serdev) /* Power on */ err = regulator_enable(bdev->vcc); - if (err < 0) + if (err < 0) { + clk_disable_unprepare(bdev->osc); return err; + } /* Reset if the reset-gpios is available otherwise the board * -level design should be guaranteed. @@ -1068,8 +1081,10 @@ static void btmtkuart_remove(struct serdev_device *serdev) struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); struct hci_dev *hdev = bdev->hdev; - if (btmtkuart_is_standalone(bdev)) + if (btmtkuart_is_standalone(bdev)) { regulator_disable(bdev->vcc); + clk_disable_unprepare(bdev->osc); + } hci_unregister_dev(hdev); hci_free_dev(hdev); -- 2.17.1