clk: Provide OF helper to mark clocks as CRITICAL
This call matches clocks which have been marked as critical in DT
and sets the appropriate flag. These flags can then be used to
mark the clock core flags appropriately prior to registration.
Legacy bindings requiring this feature must add the clock-critical
property to their binding descriptions, as it is not a part of
common-clock binding.
Cc: devicetree@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1455225554-13267-4-git-send-email-mturquette@baylibre.com
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index dede0ce..9f77cc6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3138,6 +3138,41 @@
}
/**
+ * of_clk_detect_critical() - set CLK_IS_CRITICAL flag from Device Tree
+ * @np: Device node pointer associated with clock provider
+ * @index: clock index
+ * @flags: pointer to clk_core->flags
+ *
+ * Detects if the clock-critical property exists and, if so, sets the
+ * corresponding CLK_IS_CRITICAL flag.
+ *
+ * Do not use this function. It exists only for legacy Device Tree
+ * bindings, such as the one-clock-per-node style that are outdated.
+ * Those bindings typically put all clock data into .dts and the Linux
+ * driver has no clock data, thus making it impossible to set this flag
+ * correctly from the driver. Only those drivers may call
+ * of_clk_detect_critical from their setup functions.
+ *
+ * Return: error code or zero on success
+ */
+int of_clk_detect_critical(struct device_node *np,
+ int index, unsigned long *flags)
+{
+ struct property *prop;
+ const __be32 *cur;
+ uint32_t idx;
+
+ if (!np || !flags)
+ return -EINVAL;
+
+ of_property_for_each_u32(np, "clock-critical", prop, cur, idx)
+ if (index == idx)
+ *flags |= CLK_IS_CRITICAL;
+
+ return 0;
+}
+
+/**
* of_clk_init() - Scan and init clock providers from the DT
* @matches: array of compatible values and init functions for providers.
*
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 0638b41..15628644 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -721,7 +721,8 @@
int of_clk_parent_fill(struct device_node *np, const char **parents,
unsigned int size);
const char *of_clk_get_parent_name(struct device_node *np, int index);
-
+int of_clk_detect_critical(struct device_node *np, int index,
+ unsigned long *flags);
void of_clk_init(const struct of_device_id *matches);
#else /* !CONFIG_OF */
@@ -758,6 +759,11 @@
{
return NULL;
}
+static inline int of_clk_detect_critical(struct device_node *np, int index,
+ unsigned long *flags)
+{
+ return 0;
+}
static inline void of_clk_init(const struct of_device_id *matches) {}
#endif /* CONFIG_OF */