mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 23:47:24 +00:00
756d64e43e
The digital phase-locked loop (DPLL) provides all interface clocks and functional clocks to the processor of the AM33xx device. The AM33xx device integrates five different DPLLs: * Core DPLL * Per DPLL * LCD DPLL * DDR DPLL * MPU DPLL The patch adds support for the compatible strings: * "ti,am3-dpll-core-clock" * "ti,am3-dpll-no-gate-clock" * "ti,am3-dpll-no-gate-j-type-clock" * "ti,am3-dpll-x2-clock" The code is loosely based on the drivers/clk/ti/dpll.c drivers of the Linux kernel version 5.9-rc7. For DT binding details see: - Documentation/devicetree/bindings/clock/ti/dpll.txt Signed-off-by: Dario Binacchi <dariobin@libero.it>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* TI DPLL x2 clock support
|
|
*
|
|
* Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
|
|
*
|
|
* Loosely based on Linux kernel drivers/clk/ti/dpll.c
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk-uclass.h>
|
|
#include <dm.h>
|
|
#include <dm/device_compat.h>
|
|
#include <linux/clk-provider.h>
|
|
|
|
struct clk_ti_am3_dpll_x2_priv {
|
|
struct clk parent;
|
|
};
|
|
|
|
static ulong clk_ti_am3_dpll_x2_get_rate(struct clk *clk)
|
|
{
|
|
struct clk_ti_am3_dpll_x2_priv *priv = dev_get_priv(clk->dev);
|
|
unsigned long rate;
|
|
|
|
rate = clk_get_rate(&priv->parent);
|
|
if (IS_ERR_VALUE(rate))
|
|
return rate;
|
|
|
|
rate *= 2;
|
|
dev_dbg(clk->dev, "rate=%ld\n", rate);
|
|
return rate;
|
|
}
|
|
|
|
const struct clk_ops clk_ti_am3_dpll_x2_ops = {
|
|
.get_rate = clk_ti_am3_dpll_x2_get_rate,
|
|
};
|
|
|
|
static int clk_ti_am3_dpll_x2_remove(struct udevice *dev)
|
|
{
|
|
struct clk_ti_am3_dpll_x2_priv *priv = dev_get_priv(dev);
|
|
int err;
|
|
|
|
err = clk_release_all(&priv->parent, 1);
|
|
if (err) {
|
|
dev_err(dev, "failed to release parent clock\n");
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int clk_ti_am3_dpll_x2_probe(struct udevice *dev)
|
|
{
|
|
struct clk_ti_am3_dpll_x2_priv *priv = dev_get_priv(dev);
|
|
int err;
|
|
|
|
err = clk_get_by_index(dev, 0, &priv->parent);
|
|
if (err) {
|
|
dev_err(dev, "%s: failed to get parent clock\n", __func__);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id clk_ti_am3_dpll_x2_of_match[] = {
|
|
{.compatible = "ti,am3-dpll-x2-clock"},
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(clk_ti_am3_dpll_x2) = {
|
|
.name = "ti_am3_dpll_x2_clock",
|
|
.id = UCLASS_CLK,
|
|
.of_match = clk_ti_am3_dpll_x2_of_match,
|
|
.probe = clk_ti_am3_dpll_x2_probe,
|
|
.remove = clk_ti_am3_dpll_x2_remove,
|
|
.priv_auto = sizeof(struct clk_ti_am3_dpll_x2_priv),
|
|
.ops = &clk_ti_am3_dpll_x2_ops,
|
|
};
|