Re: [PATCH RFC v1 0/5] clk: support clocks which requires parent clock on during operation
From: Dong Aisheng
Date: Wed Apr 29 2015 - 22:49:35 EST
On Wed, Apr 22, 2015 at 02:12:43PM +0800, Dong Aisheng wrote:
> 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.
Any comments about this patch series?
> 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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