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SubjectRe: [PATCH RFC v1 0/5] clk: support clocks which requires parent clock on during operation
On Wed, Apr 15, 2015 at 10:26:34PM +0800, Dong Aisheng wrote:
> This patch series adds support in clock framework for clocks which operations
> requires its parent clock is on.
>
> Such clock type is initially met on Freescale i.MX7D platform that all clocks
> operations, including enable/disable, rate change and re-parent, requires its
> parent clock on. No sure if any other SoC has the similar clock type.
>
> Current clock core can not support such type of clock well.
>
> This patch introduce a new flag CLK_SET_PARENT_ON to handle this special case
> in clock core that enable its parent clock firstly for each operation and disable
> it later after operation complete.
>
> The most special case is for set_parent() operation which requires both parent,
> old one and new one, to be enabled at the same time during the operation.
>
> Patch 1~3 are minor cleanup & fixes.
> Patch 4 add CLK_SET_PARENT_ON flags in clock core to support such type clocks
> Patch 5 show the need of introducing clk_core_enable_lock and
> clk_core_disable_lock to easily use and reduce duplicated code.
> It can be merged into patch 4 if required.
>
> The patch series is based on for-next branch of Michael's git:
> git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git
>
> Dong Aisheng (5):
> clk: change clk_core name of __clk_set_parent_after
> clk: add missing lock when call clk_core_enable in clk_set_parent
> clk: remove unneeded __clk_enable and __clk_disable
> clk: core: add CLK_SET_PARENT_ON flags to support clocks require
> parent on
> clk: introduce clk_core_enable_lock and clk_core_disable_lock
> functions
>

Gentle Ping.

Regards
Dong Aisheng

> drivers/clk/clk.c | 112 ++++++++++++++++++++++++++++++++++---------
> include/linux/clk-provider.h | 5 ++
> 2 files changed, 94 insertions(+), 23 deletions(-)
>
> --
> 1.9.1
>


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