linux-kernel - Re: [PATCH RFC v1 0/5] clk: support clocks which requires parent clock on during operation

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Date:	Wed, 22 Apr 2015 14:12:43 +0800
From:	Dong Aisheng <b29396@...escale.com>
To:	Dong Aisheng <aisheng.dong@...escale.com>
CC:	<linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<sboyd@...eaurora.org>, <mturquette@...aro.org>,
	<shawn.guo@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<Ranjani.Vaidyanathan@...escale.com>, <b20596@...escale.com>,
	<r64343@...escale.com>, <b20788@...escale.com>
Subject: Re: [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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