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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/clk/h8300/clk-div.c
2 * H8/300 divide clock driver
4 * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
8 #include <linux/clkdev.h>
9 #include <linux/clk-provider.h>
10 #include <linux/err.h>
12 #include <linux/of_address.h>
14 static DEFINE_SPINLOCK(clklock
);
16 static void __init
h8300_div_clk_setup(struct device_node
*node
)
18 unsigned int num_parents
;
20 const char *clk_name
= node
->name
;
21 const char *parent_name
;
22 void __iomem
*divcr
= NULL
;
25 num_parents
= of_clk_get_parent_count(node
);
26 if (num_parents
< 1) {
27 pr_err("%s: no parent found", clk_name
);
31 divcr
= of_iomap(node
, 0);
33 pr_err("%s: failed to map divide register", clk_name
);
37 parent_name
= of_clk_get_parent_name(node
, 0);
38 of_property_read_u32(node
, "renesas,width", &width
);
39 clk
= clk_register_divider(NULL
, clk_name
, parent_name
,
40 CLK_SET_RATE_GATE
, divcr
, 0, width
,
41 CLK_DIVIDER_POWER_OF_TWO
, &clklock
);
43 of_clk_add_provider(node
, of_clk_src_simple_get
, clk
);
46 pr_err("%s: failed to register %s div clock (%ld)\n",
47 __func__
, clk_name
, PTR_ERR(clk
));
53 CLK_OF_DECLARE(h8300_div_clk
, "renesas,h8300-div-clock", h8300_div_clk_setup
);