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https://github.com/AsahiLinux/u-boot
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9a52be129c
Make sure that the clock self-assignment works by having a clock of clk-sbox be configured automatically when clk-sbox is probed. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
162 lines
3.1 KiB
C
162 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) Copyright 2015 Google, Inc
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/clk.h>
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struct sandbox_clk_priv {
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bool probed;
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ulong rate[SANDBOX_CLK_ID_COUNT];
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bool enabled[SANDBOX_CLK_ID_COUNT];
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bool requested[SANDBOX_CLK_ID_COUNT];
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};
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static ulong sandbox_clk_get_rate(struct clk *clk)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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if (!priv->probed)
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return -ENODEV;
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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return priv->rate[clk->id];
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}
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static ulong sandbox_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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ulong old_rate;
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if (!priv->probed)
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return -ENODEV;
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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if (!rate)
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return -EINVAL;
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old_rate = priv->rate[clk->id];
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priv->rate[clk->id] = rate;
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return old_rate;
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}
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static int sandbox_clk_enable(struct clk *clk)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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if (!priv->probed)
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return -ENODEV;
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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priv->enabled[clk->id] = true;
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return 0;
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}
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static int sandbox_clk_disable(struct clk *clk)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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if (!priv->probed)
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return -ENODEV;
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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priv->enabled[clk->id] = false;
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return 0;
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}
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static int sandbox_clk_request(struct clk *clk)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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priv->requested[clk->id] = true;
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return 0;
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}
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static int sandbox_clk_free(struct clk *clk)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
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if (clk->id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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priv->requested[clk->id] = false;
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return 0;
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}
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static struct clk_ops sandbox_clk_ops = {
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.get_rate = sandbox_clk_get_rate,
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.set_rate = sandbox_clk_set_rate,
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.enable = sandbox_clk_enable,
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.disable = sandbox_clk_disable,
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.request = sandbox_clk_request,
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.free = sandbox_clk_free,
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};
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static int sandbox_clk_probe(struct udevice *dev)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(dev);
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priv->probed = true;
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return 0;
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}
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static const struct udevice_id sandbox_clk_ids[] = {
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{ .compatible = "sandbox,clk" },
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{ }
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};
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U_BOOT_DRIVER(clk_sandbox) = {
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.name = "clk_sandbox",
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.id = UCLASS_CLK,
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.of_match = sandbox_clk_ids,
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.ops = &sandbox_clk_ops,
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.probe = sandbox_clk_probe,
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.priv_auto_alloc_size = sizeof(struct sandbox_clk_priv),
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};
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ulong sandbox_clk_query_rate(struct udevice *dev, int id)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(dev);
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if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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return priv->rate[id];
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}
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int sandbox_clk_query_enable(struct udevice *dev, int id)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(dev);
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if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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return priv->enabled[id];
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}
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int sandbox_clk_query_requested(struct udevice *dev, int id)
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{
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struct sandbox_clk_priv *priv = dev_get_priv(dev);
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if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
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return -EINVAL;
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return priv->requested[id];
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}
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