From 4aa78300a025b7e09aa8e902b2178b1870ef1ec5 Mon Sep 17 00:00:00 2001 From: Lukasz Majewski Date: Mon, 24 Jun 2019 15:50:43 +0200 Subject: [PATCH] dm: clk: Define clk_get_parent_rate() for clk operations This commit adds the clk_get_parent_rate() function, which is responsible for getting the rate of parent clock. Unfortunately, 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 alleviate this problem - the clk_get_parent_rate() function has been introduced to clk-uclass.c. Signed-off-by: Lukasz Majewski Reviewed-by: Peng Fan --- drivers/clk/clk-uclass.c | 22 ++++++++++++++++++++++ include/clk.h | 9 +++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 4346c61eea..899b2dda6f 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -395,6 +395,28 @@ struct clk *clk_get_parent(struct clk *clk) return pclk; } +long long clk_get_parent_rate(struct clk *clk) +{ + const struct clk_ops *ops; + struct clk *pclk; + + debug("%s(clk=%p)\n", __func__, clk); + + pclk = clk_get_parent(clk); + if (IS_ERR(pclk)) + return -ENODEV; + + ops = clk_dev_ops(pclk->dev); + if (!ops->get_rate) + return -ENOSYS; + + /* Read the 'rate' if not already set */ + if (!pclk->rate) + pclk->rate = clk_get_rate(pclk); + + return pclk->rate; +} + 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 e20641ee98..7b2ff8ebe6 100644 --- a/include/clk.h +++ b/include/clk.h @@ -267,6 +267,15 @@ ulong clk_get_rate(struct clk *clk); */ struct clk *clk_get_parent(struct clk *clk); +/** + * clk_get_parent_rate() - Get parent of current clock rate. + * + * @clk: A clock struct that was previously successfully requested by + * clk_request/get_by_*(). + * @return clock rate in Hz, or -ve error code. + */ +long long clk_get_parent_rate(struct clk *clk); + /** * clk_set_rate() - Set current clock rate. * -- 2.25.1