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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Sean Anderson
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*/
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#include <common.h>
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#include <dm.h>
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#include <regmap.h>
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#include <reset.h>
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#include <reset-uclass.h>
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#include <syscon.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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struct syscon_reset_priv {
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struct regmap *regmap;
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uint offset;
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uint mask;
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bool assert_high;
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};
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static int syscon_reset_request(struct reset_ctl *rst)
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{
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struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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if (BIT(rst->id) & priv->mask)
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return 0;
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else
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return -EINVAL;
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}
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static int syscon_reset_assert(struct reset_ctl *rst)
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{
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struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
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priv->assert_high ? BIT(rst->id) : 0);
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}
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static int syscon_reset_deassert(struct reset_ctl *rst)
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{
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struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
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priv->assert_high ? 0 : BIT(rst->id));
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}
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static const struct reset_ops syscon_reset_ops = {
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.request = syscon_reset_request,
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.rst_assert = syscon_reset_assert,
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.rst_deassert = syscon_reset_deassert,
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};
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int syscon_reset_probe(struct udevice *dev)
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{
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struct syscon_reset_priv *priv = dev_get_priv(dev);
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priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
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if (IS_ERR(priv->regmap))
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return -ENODEV;
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priv->offset = dev_read_u32_default(dev, "offset", 0);
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priv->mask = dev_read_u32_default(dev, "mask", 0);
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priv->assert_high = dev_read_u32_default(dev, "assert-high", true);
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return 0;
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}
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static const struct udevice_id syscon_reset_ids[] = {
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{ .compatible = "syscon-reset" },
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{ },
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};
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U_BOOT_DRIVER(syscon_reset) = {
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.name = "syscon_reset",
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.id = UCLASS_RESET,
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.of_match = syscon_reset_ids,
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.probe = syscon_reset_probe,
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.priv_auto = sizeof(struct syscon_reset_priv),
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.ops = &syscon_reset_ops,
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};
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