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From:   Bjorn Andersson <quic_bjorande@quicinc.com>
Date:   Mon, 16 Oct 2023 20:11:15 -0700
Subject: [PATCH 07/12] usb: dwc3: qcom: Instantiate dwc3 core directly
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Message-ID: <20231016-dwc3-refactor-v1-7-ab4a84165470@quicinc.com>
References: <20231016-dwc3-refactor-v1-0-ab4a84165470@quicinc.com>
In-Reply-To: <20231016-dwc3-refactor-v1-0-ab4a84165470@quicinc.com>
To:     Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Wesley Cheng <quic_wcheng@quicinc.com>,
        Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Felipe Balbi <balbi@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>
CC:     <linux-arm-msm@vger.kernel.org>, <linux-usb@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Johan Hovold <johan@kernel.org>,
        Krishna Kurapati PSSNV <quic_kriskura@quicinc.com>,
        "Bjorn Andersson" <quic_bjorande@quicinc.com>
Precedence: bulk

The Qualcomm DWC3 glue builds up a platform_device programmatically in
order to probe the DWC3 core when running off ACPI data. But with the
newly introduced support for instantiating the core directly from the
glue, this code can be replaced with a single function call.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
---
 drivers/usb/dwc3/dwc3-qcom.c | 85 ++++++++------------------------------------
 1 file changed, 15 insertions(+), 70 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 901e5050363b..cc0fe010ee8c 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -56,7 +56,6 @@
 struct dwc3_acpi_pdata {
 	u32			qscratch_base_offset;
 	u32			qscratch_base_size;
-	u32			dwc3_core_base_size;
 	int			hs_phy_irq_index;
 	int			dp_hs_phy_irq_index;
 	int			dm_hs_phy_irq_index;
@@ -676,75 +675,17 @@ static const struct software_node dwc3_qcom_swnode = {
 	.properties = dwc3_qcom_acpi_properties,
 };
 
-static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
+static int dwc3_qcom_probe_core(struct platform_device *pdev, struct dwc3_qcom *qcom)
 {
-	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
-	struct device		*dev = &pdev->dev;
-	struct resource		*res, *child_res = NULL;
-	int			irq;
-	int			ret;
-
-	qcom->dwc_dev = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
-	if (!qcom->dwc_dev)
-		return -ENOMEM;
-
-	qcom->dwc_dev->dev.parent = dev;
-	qcom->dwc_dev->dev.type = dev->type;
-	qcom->dwc_dev->dev.dma_mask = dev->dma_mask;
-	qcom->dwc_dev->dev.dma_parms = dev->dma_parms;
-	qcom->dwc_dev->dev.coherent_dma_mask = dev->coherent_dma_mask;
-
-	child_res = kcalloc(2, sizeof(*child_res), GFP_KERNEL);
-	if (!child_res) {
-		platform_device_put(qcom->dwc_dev);
-		return -ENOMEM;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get memory resource\n");
-		ret = -ENODEV;
-		goto out;
-	}
-
-	child_res[0].flags = res->flags;
-	child_res[0].start = res->start;
-	child_res[0].end = child_res[0].start +
-		qcom->acpi_pdata->dwc3_core_base_size;
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		ret = irq;
-		goto out;
-	}
-	child_res[1].flags = IORESOURCE_IRQ;
-	child_res[1].start = child_res[1].end = irq;
+	struct dwc3 *dwc;
 
-	ret = platform_device_add_resources(qcom->dwc_dev, child_res, 2);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to add resources\n");
-		goto out;
-	}
+	dwc = dwc3_probe(pdev);
+	if (IS_ERR(dwc))
+		return PTR_ERR(dwc);
 
-	ret = device_add_software_node(&qcom->dwc_dev->dev, &dwc3_qcom_swnode);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to add properties\n");
-		goto out;
-	}
+	qcom->dwc = dwc;
 
-	ret = platform_device_add(qcom->dwc_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to add device\n");
-		device_remove_software_node(&qcom->dwc_dev->dev);
-		goto out;
-	}
-	kfree(child_res);
 	return 0;
-
-out:
-	platform_device_put(qcom->dwc_dev);
-	kfree(child_res);
-	return ret;
 }
 
 static int dwc3_qcom_of_register_core(struct platform_device *pdev)
@@ -871,6 +812,12 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 			return -EINVAL;
 		}
 
+		ret = device_add_software_node(&pdev->dev, &dwc3_qcom_swnode);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to add properties\n");
+			return ret;
+		}
+
 		if (qcom->acpi_pdata->is_urs) {
 			ret = dwc3_qcom_acpi_merge_urs_resources(pdev);
 			if (ret < 0)
@@ -942,7 +889,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	if (np)
 		ret = dwc3_qcom_of_register_core(pdev);
 	else
-		ret = dwc3_qcom_acpi_register_core(pdev);
+		ret = dwc3_qcom_probe_core(pdev, qcom);
 
 	if (ret) {
 		dev_err(dev, "failed to register DWC3 Core, err=%d\n", ret);
@@ -986,10 +933,10 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 interconnect_exit:
 	dwc3_qcom_interconnect_exit(qcom);
 depopulate:
-	if (np)
+	if (qcom->dwc_dev)
 		of_platform_depopulate(&pdev->dev);
 	else
-		platform_device_put(pdev);
+		dwc3_remove(qcom->dwc);
 clk_disable:
 	for (i = qcom->num_clocks - 1; i >= 0; i--) {
 		clk_disable_unprepare(qcom->clks[i]);
@@ -1128,7 +1075,6 @@ MODULE_DEVICE_TABLE(of, dwc3_qcom_of_match);
 static const struct dwc3_acpi_pdata sdm845_acpi_pdata = {
 	.qscratch_base_offset = SDM845_QSCRATCH_BASE_OFFSET,
 	.qscratch_base_size = SDM845_QSCRATCH_SIZE,
-	.dwc3_core_base_size = SDM845_DWC3_CORE_SIZE,
 	.hs_phy_irq_index = 1,
 	.dp_hs_phy_irq_index = 4,
 	.dm_hs_phy_irq_index = 3,
@@ -1138,7 +1084,6 @@ static const struct dwc3_acpi_pdata sdm845_acpi_pdata = {
 static const struct dwc3_acpi_pdata sdm845_acpi_urs_pdata = {
 	.qscratch_base_offset = SDM845_QSCRATCH_BASE_OFFSET,
 	.qscratch_base_size = SDM845_QSCRATCH_SIZE,
-	.dwc3_core_base_size = SDM845_DWC3_CORE_SIZE,
 	.hs_phy_irq_index = 1,
 	.dp_hs_phy_irq_index = 4,
 	.dm_hs_phy_irq_index = 3,

-- 
2.25.1