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https://github.com/AsahiLinux/u-boot
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a8dc4965f0
Existing gpio-gate-clock driver acts like a simple GPIO switch without any effect on gated clock. Add actual clock actions into enable/disable ops and implement get_rate op by passing gated clock if it is enabled. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Sean Anderson <seanga2@gmail.com> Link: https://lore.kernel.org/r/20240110160956.4476-2-clamor95@gmail.com [ sorted includes ] Signed-off-by: Sean Anderson <seanga2@gmail.com>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2023 Marek Vasut <marek.vasut+renesas@mailbox.org>
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*/
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#include <clk.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <linux/clk-provider.h>
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#include <asm/gpio.h>
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struct clk_gpio_priv {
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struct gpio_desc enable; /* GPIO, controlling the gate */
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struct clk *clk; /* Gated clock */
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};
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static int clk_gpio_enable(struct clk *clk)
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{
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struct clk_gpio_priv *priv = dev_get_priv(clk->dev);
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clk_enable(priv->clk);
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dm_gpio_set_value(&priv->enable, 1);
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return 0;
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}
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static int clk_gpio_disable(struct clk *clk)
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{
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struct clk_gpio_priv *priv = dev_get_priv(clk->dev);
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dm_gpio_set_value(&priv->enable, 0);
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clk_disable(priv->clk);
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return 0;
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}
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static ulong clk_gpio_get_rate(struct clk *clk)
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{
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struct clk_gpio_priv *priv = dev_get_priv(clk->dev);
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return clk_get_rate(priv->clk);
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}
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const struct clk_ops clk_gpio_ops = {
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.enable = clk_gpio_enable,
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.disable = clk_gpio_disable,
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.get_rate = clk_gpio_get_rate,
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};
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static int clk_gpio_probe(struct udevice *dev)
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{
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struct clk_gpio_priv *priv = dev_get_priv(dev);
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int ret;
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priv->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(priv->clk)) {
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log_debug("%s: Could not get gated clock: %ld\n",
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__func__, PTR_ERR(priv->clk));
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return PTR_ERR(priv->clk);
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}
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ret = gpio_request_by_name(dev, "enable-gpios", 0,
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&priv->enable, GPIOD_IS_OUT);
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if (ret) {
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log_debug("%s: Could not decode enable-gpios (%d)\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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/*
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* When implementing clk-mux-clock, use gpio_request_list_by_name
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* and implement get_rate/set_rate/set_parent ops. This should be
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* in a separate driver and with separate Kconfig option to enable
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* that driver, since unlike Linux implementation, the U-Boot DM
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* integration would be orthogonal to this driver.
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*/
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static const struct udevice_id clk_gpio_match[] = {
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{ .compatible = "gpio-gate-clock" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(gpio_gate_clock) = {
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.name = "gpio_clock",
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.id = UCLASS_CLK,
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.of_match = clk_gpio_match,
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.probe = clk_gpio_probe,
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.priv_auto = sizeof(struct clk_gpio_priv),
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.ops = &clk_gpio_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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