diff options
author | Tomasz Stanislawski <t.stanislaws@samsung.com> | 2013-10-15 17:59:11 +0200 |
---|---|---|
committer | Chanho Park <chanho61.park@samsung.com> | 2014-03-20 17:43:45 +0900 |
commit | 23a8c31f0e3d5fb47cb235ad0a2d7590511080ac (patch) | |
tree | 2461eba5cf66a9122d85a5d36a896a338c125830 /drivers | |
parent | 3b0b039f820828ca8dea5d54a733e2193884e448 (diff) | |
download | linux-3.10-23a8c31f0e3d5fb47cb235ad0a2d7590511080ac.tar.gz linux-3.10-23a8c31f0e3d5fb47cb235ad0a2d7590511080ac.tar.bz2 linux-3.10-23a8c31f0e3d5fb47cb235ad0a2d7590511080ac.zip |
clk: propagate parent change up one level
This patch adds support for propagation of setup of clock's parent one level
up.
This feature is helpful when a driver changes topology of its clocks using
clk_set_parent(). The problem occurs when on one platform/SoC driver's clock
is located at MUX output but on the other platform/SoC there is a gated proxy
clock between the MUX and driver's clock. In such a case, driver's code has to
be modified to use one clock for enabling and the other clock for setup of a
parent.
The code updates are avoided by propagating setup of a parent up one level.
Additionally, this patch adds CLK_SET_PARENT_PARENT (sorry for naming) flag to
inform clk-core that clk_set_parent() should be propagated.
Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Change-Id: I206d23fb86cc09bce943ef9971a710876e3a7744
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/clk/clk.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index a9abf1ba69b..ba2f31b1861 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1506,6 +1506,12 @@ int clk_set_parent(struct clk *clk, struct clk *parent) /* try finding the new parent index */ if (parent) { + if ((clk->flags & CLK_SET_PARENT_PARENT) + && clk->num_parents == 1) { + ret = clk_set_parent(clk->parent, parent); + goto out; + } + p_index = clk_fetch_parent_index(clk, parent); p_rate = parent->rate; if (p_index == clk->num_parents) { |