mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
319f1276f9
I "forgot" to update the dtb and the kernel crashed: |Unable to handle kernel NULL pointer dereference at virtual address 0000002e |PC is at __clk_get_flags+0x4/0xc |LR is at ti_dt_clockdomains_setup+0x70/0xe8 because I did not have the clock nodes. of_clk_get() returns an error pointer which is not checked here. Acked-by: Nishanth Menon <nm@ti.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Tero Kristo <t-kristo@ti.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
|
|
* OMAP clockdomain support
|
|
*
|
|
* Copyright (C) 2013 Texas Instruments, Inc.
|
|
*
|
|
* Tero Kristo <t-kristo@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/clk/ti.h>
|
|
|
|
#undef pr_fmt
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
static void __init of_ti_clockdomain_setup(struct device_node *node)
|
|
{
|
|
struct clk *clk;
|
|
struct clk_hw *clk_hw;
|
|
const char *clkdm_name = node->name;
|
|
int i;
|
|
int num_clks;
|
|
|
|
num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");
|
|
|
|
for (i = 0; i < num_clks; i++) {
|
|
clk = of_clk_get(node, i);
|
|
if (IS_ERR(clk)) {
|
|
pr_err("%s: Failed get %s' clock nr %d (%ld)\n",
|
|
__func__, node->full_name, i, PTR_ERR(clk));
|
|
continue;
|
|
}
|
|
if (__clk_get_flags(clk) & CLK_IS_BASIC) {
|
|
pr_warn("can't setup clkdm for basic clk %s\n",
|
|
__clk_get_name(clk));
|
|
continue;
|
|
}
|
|
clk_hw = __clk_get_hw(clk);
|
|
to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
|
|
omap2_init_clk_clkdm(clk_hw);
|
|
}
|
|
}
|
|
|
|
static struct of_device_id ti_clkdm_match_table[] __initdata = {
|
|
{ .compatible = "ti,clockdomain" },
|
|
{ }
|
|
};
|
|
|
|
/**
|
|
* ti_dt_clockdomains_setup - setup device tree clockdomains
|
|
*
|
|
* Initializes clockdomain nodes for a SoC. This parses through all the
|
|
* nodes with compatible = "ti,clockdomain", and add the clockdomain
|
|
* info for all the clocks listed under these. This function shall be
|
|
* called after rest of the DT clock init has completed and all
|
|
* clock nodes have been registered.
|
|
*/
|
|
void __init ti_dt_clockdomains_setup(void)
|
|
{
|
|
struct device_node *np;
|
|
for_each_matching_node(np, ti_clkdm_match_table) {
|
|
of_ti_clockdomain_setup(np);
|
|
}
|
|
}
|