Commit 62f47711 authored by Stephen Boyd's avatar Stephen Boyd Committed by Michael Turquette

clk: versatile: Switch to assigned clock parents

We're removing struct clk from the clk provider API. This code is
calling the consumer APIs to change the parent to a 1 MHz fixed
rate clock for each of the clocks that the driver provides. Move
to using the assigned-clock-parents DT property for this instead.
Because this is an ABI break, detect if the property is missing
and fall back to setting the parent explicitly before the clocks
are registered.
Acked-by: default avatarPawel Moll <pawel.moll@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 32ecaf89
...@@ -24,12 +24,23 @@ Required properties: ...@@ -24,12 +24,23 @@ Required properties:
- clock-output-names: from the common clock bindings; - clock-output-names: from the common clock bindings;
should be: "timerclken0", "timerclken1", "timerclken2", "timerclken3" should be: "timerclken0", "timerclken1", "timerclken2", "timerclken3"
- assigned-clocks: from the common clock binding;
should be: clock specifier for each output clock of this
provider node
- assigned-clock-parents: from the common clock binding;
should be: phandle of input clock listed in clocks
property with the highest frequency
Example: Example:
sysctl@020000 { v2m_sysctl: sysctl@020000 {
compatible = "arm,sp810", "arm,primecell"; compatible = "arm,sp810", "arm,primecell";
reg = <0x020000 0x1000>; reg = <0x020000 0x1000>;
clocks = <&v2m_refclk32khz>, <&v2m_refclk1mhz>, <&smbclk>; clocks = <&v2m_refclk32khz>, <&v2m_refclk1mhz>, <&smbclk>;
clock-names = "refclk", "timclk", "apb_pclk"; clock-names = "refclk", "timclk", "apb_pclk";
#clock-cells = <1>; #clock-cells = <1>;
clock-output-names = "timerclken0", "timerclken1", "timerclken2", "timerclken3"; clock-output-names = "timerclken0", "timerclken1", "timerclken2", "timerclken3";
assigned-clocks = <&v2m_sysctl 0>, <&v2m_sysctl 1>, <&v2m_sysctl 3>, <&v2m_sysctl 3>;
assigned-clock-parents = <&v2m_refclk1mhz>, <&v2m_refclk1mhz>, <&v2m_refclk1mhz>, <&v2m_refclk1mhz>;
}; };
...@@ -33,12 +33,9 @@ struct clk_sp810_timerclken { ...@@ -33,12 +33,9 @@ struct clk_sp810_timerclken {
struct clk_sp810 { struct clk_sp810 {
struct device_node *node; struct device_node *node;
int refclk_index, timclk_index;
void __iomem *base; void __iomem *base;
spinlock_t lock; spinlock_t lock;
struct clk_sp810_timerclken timerclken[4]; struct clk_sp810_timerclken timerclken[4];
struct clk *refclk;
struct clk *timclk;
}; };
static u8 clk_sp810_timerclken_get_parent(struct clk_hw *hw) static u8 clk_sp810_timerclken_get_parent(struct clk_hw *hw)
...@@ -71,55 +68,7 @@ static int clk_sp810_timerclken_set_parent(struct clk_hw *hw, u8 index) ...@@ -71,55 +68,7 @@ static int clk_sp810_timerclken_set_parent(struct clk_hw *hw, u8 index)
return 0; return 0;
} }
/*
* FIXME - setting the parent every time .prepare is invoked is inefficient.
* This is better handled by a dedicated clock tree configuration mechanism at
* init-time. Revisit this later when such a mechanism exists
*/
static int clk_sp810_timerclken_prepare(struct clk_hw *hw)
{
struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
struct clk_sp810 *sp810 = timerclken->sp810;
struct clk *old_parent = __clk_get_parent(hw->clk);
struct clk *new_parent;
if (!sp810->refclk)
sp810->refclk = of_clk_get(sp810->node, sp810->refclk_index);
if (!sp810->timclk)
sp810->timclk = of_clk_get(sp810->node, sp810->timclk_index);
if (WARN_ON(IS_ERR(sp810->refclk) || IS_ERR(sp810->timclk)))
return -ENOENT;
/* Select fastest parent */
if (clk_get_rate(sp810->refclk) > clk_get_rate(sp810->timclk))
new_parent = sp810->refclk;
else
new_parent = sp810->timclk;
/* Switch the parent if necessary */
if (old_parent != new_parent) {
clk_prepare(new_parent);
clk_set_parent(hw->clk, new_parent);
clk_unprepare(old_parent);
}
return 0;
}
static void clk_sp810_timerclken_unprepare(struct clk_hw *hw)
{
struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
struct clk_sp810 *sp810 = timerclken->sp810;
clk_put(sp810->timclk);
clk_put(sp810->refclk);
}
static const struct clk_ops clk_sp810_timerclken_ops = { static const struct clk_ops clk_sp810_timerclken_ops = {
.prepare = clk_sp810_timerclken_prepare,
.unprepare = clk_sp810_timerclken_unprepare,
.get_parent = clk_sp810_timerclken_get_parent, .get_parent = clk_sp810_timerclken_get_parent,
.set_parent = clk_sp810_timerclken_set_parent, .set_parent = clk_sp810_timerclken_set_parent,
}; };
...@@ -140,24 +89,18 @@ static void __init clk_sp810_of_setup(struct device_node *node) ...@@ -140,24 +89,18 @@ static void __init clk_sp810_of_setup(struct device_node *node)
{ {
struct clk_sp810 *sp810 = kzalloc(sizeof(*sp810), GFP_KERNEL); struct clk_sp810 *sp810 = kzalloc(sizeof(*sp810), GFP_KERNEL);
const char *parent_names[2]; const char *parent_names[2];
int num = ARRAY_SIZE(parent_names);
char name[12]; char name[12];
struct clk_init_data init; struct clk_init_data init;
int i; int i;
bool deprecated;
if (!sp810) { if (!sp810) {
pr_err("Failed to allocate memory for SP810!\n"); pr_err("Failed to allocate memory for SP810!\n");
return; return;
} }
sp810->refclk_index = of_property_match_string(node, "clock-names", if (of_clk_parent_fill(node, parent_names, num) != num) {
"refclk");
parent_names[0] = of_clk_get_parent_name(node, sp810->refclk_index);
sp810->timclk_index = of_property_match_string(node, "clock-names",
"timclk");
parent_names[1] = of_clk_get_parent_name(node, sp810->timclk_index);
if (!parent_names[0] || !parent_names[1]) {
pr_warn("Failed to obtain parent clocks for SP810!\n"); pr_warn("Failed to obtain parent clocks for SP810!\n");
return; return;
} }
...@@ -170,7 +113,9 @@ static void __init clk_sp810_of_setup(struct device_node *node) ...@@ -170,7 +113,9 @@ static void __init clk_sp810_of_setup(struct device_node *node)
init.ops = &clk_sp810_timerclken_ops; init.ops = &clk_sp810_timerclken_ops;
init.flags = CLK_IS_BASIC; init.flags = CLK_IS_BASIC;
init.parent_names = parent_names; init.parent_names = parent_names;
init.num_parents = ARRAY_SIZE(parent_names); init.num_parents = num;
deprecated = !of_find_property(node, "assigned-clock-parents", NULL);
for (i = 0; i < ARRAY_SIZE(sp810->timerclken); i++) { for (i = 0; i < ARRAY_SIZE(sp810->timerclken); i++) {
snprintf(name, ARRAY_SIZE(name), "timerclken%d", i); snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
...@@ -179,6 +124,15 @@ static void __init clk_sp810_of_setup(struct device_node *node) ...@@ -179,6 +124,15 @@ static void __init clk_sp810_of_setup(struct device_node *node)
sp810->timerclken[i].channel = i; sp810->timerclken[i].channel = i;
sp810->timerclken[i].hw.init = &init; sp810->timerclken[i].hw.init = &init;
/*
* If DT isn't setting the parent, force it to be
* the 1 MHz clock without going through the framework.
* We do this before clk_register() so that it can determine
* the parent and setup the tree properly.
*/
if (deprecated)
init.ops->set_parent(&sp810->timerclken[i].hw, 1);
sp810->timerclken[i].clk = clk_register(NULL, sp810->timerclken[i].clk = clk_register(NULL,
&sp810->timerclken[i].hw); &sp810->timerclken[i].hw);
WARN_ON(IS_ERR(sp810->timerclken[i].clk)); WARN_ON(IS_ERR(sp810->timerclken[i].clk));
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment