bus: Add support for Tegra ACONNECT (46a88534) · Commits · 戴 / test

drivers/bus/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -132,6 +132,19 @@ config SUNXI_RSB
		with various RSB based devices, such as AXP223, AXP8XX PMICs,
		and AC100/AC200 ICs.

		# TODO: This uses pm_clk_*() symbols that aren't exported in v4.7 and hence
		# the driver will fail to build as a module. However there are patches to
		# address that queued for v4.8, so this can be turned into a tristate symbol
		# after v4.8-rc1.
		config TEGRA_ACONNECT
		bool "Tegra ACONNECT Bus Driver"
		depends on ARCH_TEGRA_210_SOC
		depends on OF && PM
		select PM_CLK
		help
		Driver for the Tegra ACONNECT bus which is used to interface with
		the devices inside the Audio Processing Engine (APE) for Tegra210.

		config UNIPHIER_SYSTEM_BUS
		tristate "UniPhier System Bus driver"
		depends on ARCH_UNIPHIER && OF

drivers/bus/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -17,5 +17,6 @@ obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o
		obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
		obj-$(CONFIG_SUNXI_RSB) += sunxi-rsb.o
		obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
		obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o
		obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o
		obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o

drivers/bus/tegra-aconnect.c

0 → 100644

+112 −0

Original line number	Diff line number	Diff line
		/*
		* Tegra ACONNECT Bus Driver
		*
		* Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
		*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*/

		#include <linux/clk.h>
		#include <linux/module.h>
		#include <linux/of_platform.h>
		#include <linux/platform_device.h>
		#include <linux/pm_clock.h>
		#include <linux/pm_runtime.h>

		static int tegra_aconnect_add_clock(struct device dev, char name)
		{
		struct clk *clk;
		int ret;

		clk = clk_get(dev, name);
		if (IS_ERR(clk)) {
		dev_err(dev, "%s clock not found\n", name);
		return PTR_ERR(clk);
		}

		ret = pm_clk_add_clk(dev, clk);
		if (ret)
		clk_put(clk);

		return ret;
		}

		static int tegra_aconnect_probe(struct platform_device *pdev)
		{
		int ret;

		if (!pdev->dev.of_node)
		return -EINVAL;

		ret = pm_clk_create(&pdev->dev);
		if (ret)
		return ret;

		ret = tegra_aconnect_add_clock(&pdev->dev, "ape");
		if (ret)
		goto clk_destroy;

		ret = tegra_aconnect_add_clock(&pdev->dev, "apb2ape");
		if (ret)
		goto clk_destroy;

		pm_runtime_enable(&pdev->dev);

		of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

		dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");

		return 0;

		clk_destroy:
		pm_clk_destroy(&pdev->dev);

		return ret;
		}

		static int tegra_aconnect_remove(struct platform_device *pdev)
		{
		pm_runtime_disable(&pdev->dev);

		pm_clk_destroy(&pdev->dev);

		return 0;
		}

		static int tegra_aconnect_runtime_resume(struct device *dev)
		{
		return pm_clk_resume(dev);
		}

		static int tegra_aconnect_runtime_suspend(struct device *dev)
		{
		return pm_clk_suspend(dev);
		}

		static const struct dev_pm_ops tegra_aconnect_pm_ops = {
		SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
		tegra_aconnect_runtime_resume, NULL)
		};

		static const struct of_device_id tegra_aconnect_of_match[] = {
		{ .compatible = "nvidia,tegra210-aconnect", },
		{ }
		};
		MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);

		static struct platform_driver tegra_aconnect_driver = {
		.probe = tegra_aconnect_probe,
		.remove = tegra_aconnect_remove,
		.driver = {
		.name = "tegra-aconnect",
		.of_match_table = tegra_aconnect_of_match,
		.pm = &tegra_aconnect_pm_ops,
		},
		};
		module_platform_driver(tegra_aconnect_driver);

		MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
		MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
		MODULE_LICENSE("GPL v2");

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