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[92.34.215.146]) by smtp.gmail.com with ESMTPSA id p18sm4155723ljn.127.2020.11.03.04.09.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2020 04:09:47 -0800 (PST) From: Linus Walleij To: Marcel Holtmann , Johan Hedberg Cc: linux-bluetooth@vger.kernel.org, Linus Walleij Subject: [PATCH 2/2] Bluetooth: btbcm: Obtain and handle reset GPIO Date: Tue, 3 Nov 2020 13:09:43 +0100 Message-Id: <20201103120943.1289277-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201103120943.1289277-1-linus.walleij@linaro.org> References: <20201103120943.1289277-1-linus.walleij@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Obtain and drive the optional reset GPIO line if this is not hardwired in the platform. This is needed on the Samsung GT-I9070 mobile phone. The invers of power is used, this should be OK to apply simultaneously as the power signal according to figures 47-51 on pages 159-161 in the BCM4330 datasheet. Signed-off-by: Linus Walleij --- drivers/bluetooth/hci_bcm.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index 8ea5ca8d71d6..15a28b90c2d0 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -68,6 +68,8 @@ struct bcm_device_data { * deassert = Bluetooth device may sleep when sleep criteria are met * @shutdown: BT_REG_ON pin, * power up or power down Bluetooth device internal regulators + * @reset: BT_RST_N pin, + * active low resets the Bluetooth logic core * @set_device_wakeup: callback to toggle BT_WAKE pin * either by accessing @device_wakeup or by calling @btlp * @set_shutdown: callback to toggle BT_REG_ON pin @@ -101,6 +103,7 @@ struct bcm_device { const char *name; struct gpio_desc *device_wakeup; struct gpio_desc *shutdown; + struct gpio_desc *reset; int (*set_device_wakeup)(struct bcm_device *, bool); int (*set_shutdown)(struct bcm_device *, bool); #ifdef CONFIG_ACPI @@ -984,6 +987,15 @@ static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake) static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered) { gpiod_set_value_cansleep(dev->shutdown, powered); + if (dev->reset) + /* + * The reset line is asserted on powerdown and deasserted + * on poweron so the inverse of powered is used. Notice + * that the GPIO line BT_RST_N needs to be specified as + * active low in the device tree or similar system + * description. + */ + gpiod_set_value_cansleep(dev->reset, !powered); return 0; } @@ -1049,6 +1061,11 @@ static int bcm_get_resources(struct bcm_device *dev) if (IS_ERR(dev->shutdown)) return PTR_ERR(dev->shutdown); + dev->reset = devm_gpiod_get_optional(dev->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(dev->reset)) + return PTR_ERR(dev->reset); + dev->set_device_wakeup = bcm_gpio_set_device_wakeup; dev->set_shutdown = bcm_gpio_set_shutdown;