1 // SPDX-License-Identifier: GPL-2.0+
3 * TI gate clock support
5 * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
7 * Loosely based on Linux kernel drivers/clk/ti/gate.c
12 #include <dm/device_compat.h>
13 #include <clk-uclass.h>
15 #include <linux/clk-provider.h>
17 struct clk_ti_gate_priv {
24 static int clk_ti_gate_disable(struct clk *clk)
26 struct clk_ti_gate_priv *priv = dev_get_priv(clk->dev);
30 if (priv->invert_enable)
31 v |= (1 << priv->enable_bit);
33 v &= ~(1 << priv->enable_bit);
36 /* No OCP barrier needed here since it is a disable operation */
40 static int clk_ti_gate_enable(struct clk *clk)
42 struct clk_ti_gate_priv *priv = dev_get_priv(clk->dev);
46 if (priv->invert_enable)
47 v &= ~(1 << priv->enable_bit);
49 v |= (1 << priv->enable_bit);
57 static int clk_ti_gate_of_to_plat(struct udevice *dev)
59 struct clk_ti_gate_priv *priv = dev_get_priv(dev);
61 priv->reg = dev_read_addr(dev);
62 if (priv->reg == FDT_ADDR_T_NONE) {
63 dev_err(dev, "failed to get control register\n");
67 dev_dbg(dev, "reg=0x%08lx\n", priv->reg);
68 priv->enable_bit = dev_read_u32_default(dev, "ti,bit-shift", 0);
69 if (dev_read_bool(dev, "ti,set-rate-parent"))
70 priv->flags |= CLK_SET_RATE_PARENT;
72 priv->invert_enable = dev_read_bool(dev, "ti,set-bit-to-disable");
76 static struct clk_ops clk_ti_gate_ops = {
77 .enable = clk_ti_gate_enable,
78 .disable = clk_ti_gate_disable,
81 static const struct udevice_id clk_ti_gate_of_match[] = {
82 { .compatible = "ti,gate-clock" },
86 U_BOOT_DRIVER(clk_ti_gate) = {
87 .name = "ti_gate_clock",
89 .of_match = clk_ti_gate_of_match,
90 .ofdata_to_platdata = clk_ti_gate_of_to_plat,
91 .priv_auto = sizeof(struct clk_ti_gate_priv),
92 .ops = &clk_ti_gate_ops,