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-rw-r--r--target/linux/ipq806x/patches-4.4/097-usb-dwc3-add-generic-OF-glue-layer.patch244
1 files changed, 244 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.4/097-usb-dwc3-add-generic-OF-glue-layer.patch b/target/linux/ipq806x/patches-4.4/097-usb-dwc3-add-generic-OF-glue-layer.patch
new file mode 100644
index 0000000000..96e9859060
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/097-usb-dwc3-add-generic-OF-glue-layer.patch
@@ -0,0 +1,244 @@
+From 41c2b5280cd2fa3e198c422cdf223ba6e48f857a Mon Sep 17 00:00:00 2001
+From: Felipe Balbi <balbi@ti.com>
+Date: Wed, 18 Nov 2015 13:15:20 -0600
+Subject: [PATCH] usb: dwc3: add generic OF glue layer
+
+For simple platforms which merely enable some clocks
+and populate its children, we can use this generic
+glue layer to avoid boilerplate code duplication.
+
+For now this supports Qcom and Xilinx, but if we
+find a way to add generic handling of regulators and
+optional PHYs, we can absorb exynos as well.
+
+Tested-by: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
+Signed-off-by: Felipe Balbi <balbi@ti.com>
+(cherry picked from commit 16adc674d0d68a50dfc725574738d7ae11cf5d7e)
+
+Change-Id: I6fd260442997b198dc12ca726814b7a9518e6353
+Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
+---
+ drivers/usb/dwc3/Kconfig | 9 ++
+ drivers/usb/dwc3/Makefile | 1 +
+ drivers/usb/dwc3/dwc3-of-simple.c | 178 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 188 insertions(+)
+ create mode 100644 drivers/usb/dwc3/dwc3-of-simple.c
+
+diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
+index 5a42c45..070e704 100644
+--- a/drivers/usb/dwc3/Kconfig
++++ b/drivers/usb/dwc3/Kconfig
+@@ -87,6 +87,15 @@ config USB_DWC3_KEYSTONE
+ Support of USB2/3 functionality in TI Keystone2 platforms.
+ Say 'Y' or 'M' here if you have one such device
+
++config USB_DWC3_OF_SIMPLE
++ tristate "Generic OF Simple Glue Layer"
++ depends on OF && COMMON_CLK
++ default USB_DWC3
++ help
++ Support USB2/3 functionality in simple SoC integrations.
++ Currently supports Xilinx and Qualcomm DWC USB3 IP.
++ Say 'Y' or 'M' if you have one such device.
++
+ config USB_DWC3_ST
+ tristate "STMicroelectronics Platforms"
+ depends on ARCH_STI && OF
+diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
+index acc951d..6491f9b 100644
+--- a/drivers/usb/dwc3/Makefile
++++ b/drivers/usb/dwc3/Makefile
+@@ -37,5 +37,6 @@ obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o
+ obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
+ obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
+ obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
++obj-$(CONFIG_USB_DWC3_OF_SIMPLE) += dwc3-of-simple.o
+ obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o
+ obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o
+diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
+new file mode 100644
+index 0000000..60c4c5a
+--- /dev/null
++++ b/drivers/usb/dwc3/dwc3-of-simple.c
+@@ -0,0 +1,178 @@
++/**
++ * dwc3-of-simple.c - OF glue layer for simple integrations
++ *
++ * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
++ *
++ * Author: Felipe Balbi <balbi@ti.com>
++ *
++ * This program is free software: you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 of
++ * the License as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
++ * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
++ * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/slab.h>
++#include <linux/platform_device.h>
++#include <linux/dma-mapping.h>
++#include <linux/clk.h>
++#include <linux/clk-provider.h>
++#include <linux/of.h>
++#include <linux/of_platform.h>
++#include <linux/pm_runtime.h>
++
++struct dwc3_of_simple {
++ struct device *dev;
++ struct clk **clks;
++ int num_clocks;
++};
++
++static int dwc3_of_simple_probe(struct platform_device *pdev)
++{
++ struct dwc3_of_simple *simple;
++ struct device *dev = &pdev->dev;
++ struct device_node *np = dev->of_node;
++
++ int ret;
++ int i;
++
++ simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
++ if (!simple)
++ return -ENOMEM;
++
++ ret = of_clk_get_parent_count(np);
++ if (ret < 0)
++ return ret;
++
++ simple->num_clocks = ret;
++
++ simple->clks = devm_kcalloc(dev, simple->num_clocks,
++ sizeof(struct clk *), GFP_KERNEL);
++ if (!simple->clks)
++ return -ENOMEM;
++
++ simple->dev = dev;
++
++ for (i = 0; i < simple->num_clocks; i++) {
++ struct clk *clk;
++
++ clk = of_clk_get(np, i);
++ if (IS_ERR(clk)) {
++ while (--i >= 0)
++ clk_put(simple->clks[i]);
++ return PTR_ERR(clk);
++ }
++
++ ret = clk_prepare_enable(clk);
++ if (ret < 0) {
++ while (--i >= 0) {
++ clk_disable_unprepare(simple->clks[i]);
++ clk_put(simple->clks[i]);
++ }
++ clk_put(clk);
++
++ return ret;
++ }
++
++ simple->clks[i] = clk;
++ }
++
++ ret = of_platform_populate(np, NULL, NULL, dev);
++ if (ret) {
++ for (i = 0; i < simple->num_clocks; i++) {
++ clk_disable_unprepare(simple->clks[i]);
++ clk_put(simple->clks[i]);
++ }
++
++ return ret;
++ }
++
++ pm_runtime_set_active(dev);
++ pm_runtime_enable(dev);
++ pm_runtime_get_sync(dev);
++
++ return 0;
++}
++
++static int dwc3_of_simple_remove(struct platform_device *pdev)
++{
++ struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
++ struct device *dev = &pdev->dev;
++ int i;
++
++ for (i = 0; i < simple->num_clocks; i++) {
++ clk_unprepare(simple->clks[i]);
++ clk_put(simple->clks[i]);
++ }
++
++ of_platform_depopulate(dev);
++
++ pm_runtime_put_sync(dev);
++ pm_runtime_disable(dev);
++
++ return 0;
++}
++
++static int dwc3_of_simple_runtime_suspend(struct device *dev)
++{
++ struct dwc3_of_simple *simple = dev_get_drvdata(dev);
++ int i;
++
++ for (i = 0; i < simple->num_clocks; i++)
++ clk_disable(simple->clks[i]);
++
++ return 0;
++}
++
++static int dwc3_of_simple_runtime_resume(struct device *dev)
++{
++ struct dwc3_of_simple *simple = dev_get_drvdata(dev);
++ int ret;
++ int i;
++
++ for (i = 0; i < simple->num_clocks; i++) {
++ ret = clk_enable(simple->clks[i]);
++ if (ret < 0) {
++ while (--i >= 0)
++ clk_disable(simple->clks[i]);
++ return ret;
++ }
++ }
++
++ return 0;
++}
++
++static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
++ SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
++ dwc3_of_simple_runtime_resume, NULL)
++};
++
++static const struct of_device_id of_dwc3_simple_match[] = {
++ { .compatible = "qcom,dwc3" },
++ { .compatible = "xlnx,zynqmp-dwc3" },
++ { /* Sentinel */ }
++};
++MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
++
++static struct platform_driver dwc3_of_simple_driver = {
++ .probe = dwc3_of_simple_probe,
++ .remove = dwc3_of_simple_remove,
++ .driver = {
++ .name = "dwc3-of-simple",
++ .of_match_table = of_dwc3_simple_match,
++ },
++};
++
++module_platform_driver(dwc3_of_simple_driver);
++MODULE_LICENSE("GPL v2");
++MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
++MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
+--
+2.7.2
+
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