diff options
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/clk.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index b42b68482279..910c168bcbc1 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -3864,6 +3864,41 @@ static int parent_ready(struct device_node *np) } /** + * 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 It exists only for legacy Device Tree + * bindings, such as the one-clock-per-node style that are outdated.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. * |