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Subject[PATCH] clk: clk-gpio: Add dt option to propagate rate change to parent
Date
From: Michael Hennerich <michael.hennerich@analog.com>

For certain setups/boards it's useful to propagate the rate change of the
clock up one level to the parent clock.

This change implements this by defining a `clk-set-rate-parent` device-tree
property which sets the `CLK_SET_RATE_PARENT` flag to the clock (when set).

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
drivers/clk/clk-gpio.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c
index 9d930edd6516..6dfbc4b952fe 100644
--- a/drivers/clk/clk-gpio.c
+++ b/drivers/clk/clk-gpio.c
@@ -241,6 +241,7 @@ static int gpio_clk_driver_probe(struct platform_device *pdev)
struct device_node *node = pdev->dev.of_node;
const char **parent_names, *gpio_name;
unsigned int num_parents;
+ unsigned long clk_flags;
struct gpio_desc *gpiod;
struct clk *clk;
bool is_mux;
@@ -274,13 +275,16 @@ static int gpio_clk_driver_probe(struct platform_device *pdev)
return ret;
}

+ clk_flags = of_property_read_bool(node, "clk-set-rate-parent") ?
+ CLK_SET_RATE_PARENT : 0;
+
if (is_mux)
clk = clk_register_gpio_mux(&pdev->dev, node->name,
- parent_names, num_parents, gpiod, 0);
+ parent_names, num_parents, gpiod, clk_flags);
else
clk = clk_register_gpio_gate(&pdev->dev, node->name,
parent_names ? parent_names[0] : NULL, gpiod,
- 0);
+ clk_flags);
if (IS_ERR(clk))
return PTR_ERR(clk);

--
2.20.1
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