This commit adds the clk_get_parent() function, which is responsible for getting the parent's struct clock pointer.
U-Boot's DM support for getting parent is different (the parent relationship is in udevice) than the one in Common Clock Framework [CCF] in Linux. To obtain the pointer to struct clk of parent the pdev->uclass_priv field is read via dev_get_clk_ptr() wrapper.
Signed-off-by: Lukasz Majewski lukma@denx.de Reviewed-by: Peng Fan peng.fan@nxp.com
---
Changes in v6: None Changes in v5: - s/U-boot/U-Boot/g - Replace dev->driver_data with dev_get_clk_ptr() wrapper on uclass_priv
Changes in v4: None Changes in v3: - New patch
drivers/clk/clk-uclass.c | 16 ++++++++++++++++ include/clk.h | 9 +++++++++ 2 files changed, 25 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 79b3b0494c..4346c61eea 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -13,6 +13,7 @@ #include <dm/read.h> #include <dt-structs.h> #include <errno.h> +#include <linux/clk-provider.h>
static inline const struct clk_ops *clk_dev_ops(struct udevice *dev) { @@ -379,6 +380,21 @@ ulong clk_get_rate(struct clk *clk) return ops->get_rate(clk); }
+struct clk *clk_get_parent(struct clk *clk) +{ + struct udevice *pdev; + struct clk *pclk; + + debug("%s(clk=%p)\n", __func__, clk); + + pdev = dev_get_parent(clk->dev); + pclk = dev_get_clk_ptr(pdev); + if (!pclk) + return ERR_PTR(-ENODEV); + + return pclk; +} + ulong clk_set_rate(struct clk *clk, ulong rate) { const struct clk_ops *ops = clk_dev_ops(clk->dev); diff --git a/include/clk.h b/include/clk.h index b10c0013b1..e20641ee98 100644 --- a/include/clk.h +++ b/include/clk.h @@ -259,6 +259,15 @@ int clk_free(struct clk *clk); ulong clk_get_rate(struct clk *clk);
/** + * clk_get_parent() - Get current clock's parent. + * + * @clk: A clock struct that was previously successfully requested by + * clk_request/get_by_*(). + * @return pointer to parent's struct clk, or error code passed as pointer + */ +struct clk *clk_get_parent(struct clk *clk); + +/** * clk_set_rate() - Set current clock rate. * * @clk: A clock struct that was previously successfully requested by