Commit ec7957a6 authored by Linus Walleij's avatar Linus Walleij Committed by Stephen Boyd

clk: versatile: sp810: support reentrance

Despite care take to allocate clocks state containers the
SP810 driver actually just supports creating one instance:
all clocks registered for every instance will end up with the
exact same name and __clk_init() will fail.

Rename the timclken<0> .. timclken<n> to sp810_<instance>_<n>
so every clock on every instance gets a unique name.

This is necessary for the RealView PBA8 which has two SP810
blocks: the second block will not register its clocks unless
every clock on every instance is unique and results in boot
logs like this:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at ../drivers/clk/versatile/clk-sp810.c:137
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted
4.5.0-rc2-00030-g352718fc39f6-dirty #225
Hardware name: ARM RealView Machine (Device Tree Support)
[<c00167f8>] (unwind_backtrace) from [<c0013204>]
[<c0013204>] (show_stack) from [<c01a049c>]
[<c01a049c>] (dump_stack) from [<c0024990>]
[<c0024990>] (warn_slowpath_common) from [<c0024a68>]
[<c0024a68>] (warn_slowpath_null) from [<c051eb44>]
[<c051eb44>] (clk_sp810_of_setup) from [<c051e3a4>]
[<c051e3a4>] (of_clk_init) from [<c0504714>]
[<c0504714>] (time_init) from [<c0501b18>]
[<c0501b18>] (start_kernel) from [<7000807c>] (0x7000807c)
---[ end trace cb88537fdc8fa200 ]---

Cc: Michael Turquette <>
Cc: Pawel Moll <>
Fixes: 6e973d2c "clk: vexpress: Add separate SP810 driver"
Signed-off-by: default avatarLinus Walleij <>
Signed-off-by: default avatarStephen Boyd <>
parent 2da5f5db
......@@ -92,6 +92,7 @@ static void __init clk_sp810_of_setup(struct device_node *node)
int num = ARRAY_SIZE(parent_names);
char name[12];
struct clk_init_data init;
static int instance;
int i;
bool deprecated;
......@@ -117,7 +118,7 @@ static void __init clk_sp810_of_setup(struct device_node *node)
deprecated = !of_find_property(node, "assigned-clock-parents", NULL);
for (i = 0; i < ARRAY_SIZE(sp810->timerclken); i++) {
snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
snprintf(name, sizeof(name), "sp810_%d_%d", instance, i);
sp810->timerclken[i].sp810 = sp810;
sp810->timerclken[i].channel = i;
......@@ -138,5 +139,6 @@ static void __init clk_sp810_of_setup(struct device_node *node)
of_clk_add_provider(node, clk_sp810_timerclken_of_get, sp810);
CLK_OF_DECLARE(sp810, "arm,sp810", clk_sp810_of_setup);
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