From 4e249b94af928aca29972fc22ef2b5ed0016eab9 Mon Sep 17 00:00:00 2001 From: Torsten Duwe Date: Thu, 28 May 2026 13:22:06 +0200 Subject: clk: enhance clk-gpio to also handle gated-fixed-clock Devicetree commit a198185b9b5 introduced a new type of clock, "gated-fixed-clock", for which Das U-Boot does not have a driver yet. The required code is similar to gpio-gate-clock, and can be added using little extra text space. Use this code e.g. to boot a Rock5 ITX from NVMe Signed-off-by: Torsten Duwe --- drivers/clk/clk-gpio.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) (limited to 'drivers') diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c index 4ed14306575..b7abc891ed2 100644 --- a/drivers/clk/clk-gpio.c +++ b/drivers/clk/clk-gpio.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include @@ -13,14 +14,18 @@ struct clk_gpio_priv { struct gpio_desc enable; /* GPIO, controlling the gate */ struct clk *clk; /* Gated clock */ + struct udevice *vdd_supply; }; static int clk_gpio_enable(struct clk *clk) { struct clk_gpio_priv *priv = dev_get_priv(clk->dev); - clk_enable(priv->clk); - dm_gpio_set_value(&priv->enable, 1); + if (priv->clk) + clk_enable(priv->clk); + + if (priv->enable.dev) + dm_gpio_set_value(&priv->enable, 1); return 0; } @@ -29,8 +34,11 @@ static int clk_gpio_disable(struct clk *clk) { struct clk_gpio_priv *priv = dev_get_priv(clk->dev); - dm_gpio_set_value(&priv->enable, 0); - clk_disable(priv->clk); + if (priv->enable.dev) + dm_gpio_set_value(&priv->enable, 0); + + if (priv->clk) + clk_disable(priv->clk); return 0; } @@ -39,7 +47,7 @@ static ulong clk_gpio_get_rate(struct clk *clk) { struct clk_gpio_priv *priv = dev_get_priv(clk->dev); - return clk_get_rate(priv->clk); + return (priv->clk) ? clk_get_rate(priv->clk) : -1; } const struct clk_ops clk_gpio_ops = { @@ -57,7 +65,7 @@ static int clk_gpio_probe(struct udevice *dev) if (IS_ERR(priv->clk)) { log_debug("%s: Could not get gated clock: %ld\n", __func__, PTR_ERR(priv->clk)); - return PTR_ERR(priv->clk); + priv->clk = 0; } ret = gpio_request_by_name(dev, "enable-gpios", 0, @@ -65,9 +73,15 @@ static int clk_gpio_probe(struct udevice *dev) if (ret) { log_debug("%s: Could not decode enable-gpios (%d)\n", __func__, ret); - return ret; } + ret = device_get_supply_regulator(dev, "vdd-supply", + &priv->vdd_supply); + if (ret == 0) + ret = regulator_set_enable(priv->vdd_supply, true); + + log_debug("%s: %s regulator = %d\n", __func__, dev->name, ret); + return 0; } @@ -80,6 +94,7 @@ static int clk_gpio_probe(struct udevice *dev) */ static const struct udevice_id clk_gpio_match[] = { { .compatible = "gpio-gate-clock" }, + { .compatible = "gated-fixed-clock" }, { /* sentinel */ } }; -- cgit v1.3.1