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4a3390f1d3
This type of bus is used in Linux to designate buses which have power domains and/or clocks which need to be enabled before their child devices can be used. Because power domains are automatically enabled before probing in U-Boot, we just need to enable any clocks present. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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/*
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* Power domains are taken care of by driver_probe, so we just have to enable
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* clocks
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*/
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static int simple_pm_bus_probe(struct udevice *dev)
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{
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int ret;
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struct clk_bulk *bulk = dev_get_priv(dev);
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ret = clk_get_bulk(dev, bulk);
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if (ret)
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return ret;
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ret = clk_enable_bulk(bulk);
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if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
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clk_release_bulk(bulk);
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return ret;
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}
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return 0;
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}
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static int simple_pm_bus_remove(struct udevice *dev)
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{
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int ret;
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struct clk_bulk *bulk = dev_get_priv(dev);
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ret = clk_release_bulk(bulk);
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if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
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return ret;
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else
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return 0;
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}
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static const struct udevice_id simple_pm_bus_ids[] = {
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{ .compatible = "simple-pm-bus" },
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{ }
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};
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U_BOOT_DRIVER(simple_pm_bus_drv) = {
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.name = "simple_pm_bus",
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.id = UCLASS_SIMPLE_BUS,
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.of_match = simple_pm_bus_ids,
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.probe = simple_pm_bus_probe,
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.remove = simple_pm_bus_remove,
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.priv_auto_alloc_size = sizeof(struct clk_bulk),
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.flags = DM_FLAG_PRE_RELOC,
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};
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