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89d463ea10
Add a driver for transparent busses that don't need a real driver, but where the bus controller is part of a PM domain, or under the control of a functional clock. Typically, the bus controller's PM domain and/or clock must be enabled for child devices connected to the bus (either on-SoC or externally) to function. Hence the sole purpose of this driver is to enable its clock and PM domain (if exist(s)), which are specified in the DT and managed from platform and PM domain code, and to probe for child devices. Due to the child-parent relationship with devices connected to the bus, PM domain and clock state transitions are handled in the correct order. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/*
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* Simple Power-Managed Bus Driver
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*
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* Copyright (C) 2014-2015 Glider bvba
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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static int simple_pm_bus_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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dev_dbg(&pdev->dev, "%s\n", __func__);
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pm_runtime_enable(&pdev->dev);
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if (np)
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of_platform_populate(np, NULL, NULL, &pdev->dev);
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return 0;
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}
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static int simple_pm_bus_remove(struct platform_device *pdev)
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{
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dev_dbg(&pdev->dev, "%s\n", __func__);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static const struct of_device_id simple_pm_bus_of_match[] = {
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{ .compatible = "simple-pm-bus", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match);
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static struct platform_driver simple_pm_bus_driver = {
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.probe = simple_pm_bus_probe,
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.remove = simple_pm_bus_remove,
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.driver = {
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.name = "simple-pm-bus",
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.of_match_table = simple_pm_bus_of_match,
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},
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};
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module_platform_driver(simple_pm_bus_driver);
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MODULE_DESCRIPTION("Simple Power-Managed Bus Driver");
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MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
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MODULE_LICENSE("GPL v2");
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