This patch provides the interface to register and unregister a virtual
clock which groups multiple clocks in it in order to handle this group
of clocks at once. Presently just clk_enable and clk_disable is
overwritten and other operation can be done as well.
This is just a refactor of MCBSP clock registration.
Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
---
arch/arm/plat-omap/clock.c | 80 +++++++++++++++++++++++++++++++
arch/arm/plat-omap/include/mach/clock.h | 19 +++++++
2 files changed, 99 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 23a0705..c35b968 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -374,6 +374,86 @@ EXPORT_SYMBOL(clk_init_cpufreq_table);
#endif
/*-------------------------------------------------------------------------*/
+/*
+ * Virtual clock/Clock aggregation
+ */
+static int vclk_enable(struct clk *clk)
+{
+ int i, err;
+ struct vclk *vc = container_of(clk, struct vclk, clk);
+
+ for (i = 0; i < vc->n_child; i++) {
+ err = clk_enable(vc->child[i]);
+ if (err)
+ goto err_out;
+ }
+ return 0;
+err_out:
+ while (--i >= 0)
+ clk_disable(vc->child[i]);
+ return err;
+}
+
+static void vclk_disable(struct clk *clk)
+{
+ int i;
+ struct vclk *vc = container_of(clk, struct vclk, clk);
+
+ for (i = 0; i < vc->n_child; i++)
+ clk_disable(vc->child[i]);
+}
+
+int vclk_register(struct vclk *vc, struct vclk_cci *cci, int num_child)
+{
+ int i, err;
+
+ vc->n_child = num_child;
+ vc->child = kzalloc(num_child * sizeof(struct clk *), GFP_KERNEL);
+ if (!vc->child)
+ return -ENOMEM;
+
+ vc->clk.enable = vclk_enable;
+ vc->clk.disable = vclk_disable;
+
+ for (i = 0; i < num_child; i++, cci++) {
+ struct clk *c;
+ /* fake a platform device to get correct device ID */
+ struct platform_device pdev;
+
+ c = vc->child[i];
+ pdev.dev.bus = &platform_bus_type;
+ pdev.id = cci->id;
+ c = clk_get(&pdev.dev, cci->name);
+ if (IS_ERR(c)) {
+ pr_err("Could not get clock %s (%d).\n",
+ cci->name, cci->id);
+ err = PTR_ERR(c);
+ goto err_out;
+ }
+ vc->child[i] = c;
+ }
+ err = clk_register(&vc->clk);
+ if (err)
+ goto err_out;
+ return 0;
+err_out:
+ while (--i >= 0)
+ clk_put(vc->child[i]);
+ kfree(vc->child);
+ return err;
+}
+EXPORT_SYMBOL(vclk_register);
+
+void vclk_unregister(struct vclk *vc)
+{
+ int i = vc->n_child;
+
+ clk_unregister(&vc->clk);
+ while (--i >= 0)
+ clk_put(vc->child[i]);
+ kfree(vc->child);
+}
+EXPORT_SYMBOL(vclk_unregister);
#ifdef CONFIG_OMAP_RESET_CLOCKS
/*
diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index c6762e9..5483027 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -94,6 +94,25 @@ struct clk {
#endif
};
+/*
+ * Virtual Clock which holds multiple clocks in it and does some
+ * operations (enable/disable) against these child clocks at once
+ */
+struct vclk {
+ struct clk clk;
+ struct clk **child;
+ int n_child;
+};
+
+/* Child Clock Info for virtual clock registration */
+struct vclk_cci {
+ const char *name;
+ int id;
+};
+
+extern int vclk_register(struct vclk *vclk, struct vclk_cci *cci, int n_child);
+extern void vclk_unregister(struct vclk *vclk);
+
struct cpufreq_frequency_table;
struct clk_functions {
--
1.5.5.1.357.g1af8b
--
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