[ARM] omap: provide a NULL clock operations structure
... and use it for clocks which are ALWAYS_ENABLED. These clocks
use a non-NULL enable_reg pointer for other purposes (such as
selecting clock rates.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index be6aab9..529c4a9 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -358,6 +358,23 @@
}
EXPORT_SYMBOL(clk_enable_init_clocks);
+/*
+ * Low level helpers
+ */
+static int clkll_enable_null(struct clk *clk)
+{
+ return 0;
+}
+
+static void clkll_disable_null(struct clk *clk)
+{
+}
+
+const struct clkops clkops_null = {
+ .enable = clkll_enable_null,
+ .disable = clkll_disable_null,
+};
+
#ifdef CONFIG_CPU_FREQ
void clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
{
@@ -383,8 +400,10 @@
unsigned long flags;
list_for_each_entry(ck, &clocks, node) {
- if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
- ck->enable_reg == 0)
+ if (ck->ops == &clkops_null)
+ continue;
+
+ if (ck->usecount > 0 || ck->enable_reg == 0)
continue;
spin_lock_irqsave(&clockfw_lock, flags);
diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 4fe5084e..c1e4844 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -125,11 +125,13 @@
extern int clk_get_usecount(struct clk *clk);
extern void clk_enable_init_clocks(void);
+extern const struct clkops clkops_null;
+
/* Clock flags */
#define RATE_CKCTL (1 << 0) /* Main fixed ratio clocks */
#define RATE_FIXED (1 << 1) /* Fixed clock rate */
#define RATE_PROPAGATES (1 << 2) /* Program children too */
-#define ALWAYS_ENABLED (1 << 4) /* Clock cannot be disabled */
+/* bits 3-4 are free */
#define ENABLE_REG_32BIT (1 << 5) /* Use 32-bit access */
#define VIRTUAL_IO_ADDRESS (1 << 6) /* Clock in virtual address */
#define CLOCK_IDLE_CONTROL (1 << 7)