linux-kernel - [PATCH v3 3/4] Bluetooth: hci_bcm: Support pcm params in dts

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Message-Id: <20191112001949.136377-4-abhishekpandit@chromium.org>
Date:   Mon, 11 Nov 2019 16:19:48 -0800
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-bluetooth@...r.kernel.org, dianders@...omium.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/4] Bluetooth: hci_bcm: Support pcm params in dts

BCM chips may require configuration of PCM to operate correctly and
there is a vendor specific HCI command to do this. Add support in the
hci_bcm driver to parse this from devicetree and configure the chip.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

Changes in v3: None
Changes in v2: None

 drivers/bluetooth/hci_bcm.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 6134bff58748..b7f47d9edb7d 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -88,6 +88,8 @@ struct bcm_device_data {
  *	used to disable flow control during runtime suspend and system sleep
  * @is_suspended: whether flow control is currently disabled
  * @disallow_set_baudrate: don't allow set_baudrate
+ * @has_pcm_params: whether PCM parameters need to be configured
+ * @pcm_params: PCM and routing parameters
  */
 struct bcm_device {
 	/* Must be the first member, hci_serdev.c expects this. */
@@ -122,6 +124,9 @@ struct bcm_device {
 	bool			is_suspended;
 #endif
 	bool			disallow_set_baudrate;
+
+	bool				has_pcm_params;
+	struct bcm_set_pcm_int_params	pcm_params;
 };
 
 /* generic bcm uart resources */
@@ -596,6 +601,17 @@ static int bcm_setup(struct hci_uart *hu)
 			host_set_baudrate(hu, speed);
 	}
 
+	/* PCM parameters if any*/
+	if (bcm->dev && bcm->dev->has_pcm_params) {
+		err = btbcm_set_pcm_params(hu->hdev, &bcm->dev->pcm_params,
+					   NULL);
+
+		if (err) {
+			bt_dev_info(hu->hdev, "BCM: Set pcm params failed (%d)",
+				    err);
+		}
+	}
+
 finalize:
 	release_firmware(fw);
 
@@ -1132,7 +1148,24 @@ static int bcm_acpi_probe(struct bcm_device *dev)
 
 static int bcm_of_probe(struct bcm_device *bdev)
 {
+	int err;
+
 	device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
+
+	err = device_property_read_u8(bdev->dev, "brcm,bt-sco-routing",
+				      &bdev->pcm_params.routing);
+	if (!err)
+		bdev->has_pcm_params = true;
+
+	device_property_read_u8(bdev->dev, "brcm,pcm-interface-rate",
+				&bdev->pcm_params.rate);
+	device_property_read_u8(bdev->dev, "brcm,pcm-frame-type",
+				&bdev->pcm_params.frame_sync);
+	device_property_read_u8(bdev->dev, "brcm,pcm-sync-mode",
+				&bdev->pcm_params.sync_mode);
+	device_property_read_u8(bdev->dev, "brcm,pcm-clock-mode",
+				&bdev->pcm_params.clock_mode);
+
 	return 0;
 }
 
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog