linux-kernel - Re: [PATCH v3] clk: rockchip: disable unused clocks

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Date:	Fri, 31 Oct 2014 15:59:58 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Kever Yang <kever.yang@...k-chips.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	戴克霖 (Jack) <dkl@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] clk: rockchip: disable unused clocks

Kever,

On Thu, Oct 30, 2014 at 10:10 PM, Kever Yang <kever.yang@...k-chips.com> wrote:
> The rockchip clock driver use CLK_IGNORE_UNUSED flag to make sure
> all the clocks are available like default power on state.
> We have implement the clock manage in most of rockchip drivers,
> it is time to remove it for power save.
> Instead we add CLK_IGNORE_UNUSED for some clock nodes which should
> be on during boot or no module driver in kernel will initialize it.
>
> Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
> ---
>
> Changes in v3:
> - get CLK_DIVIDER_READ_ONLY tag back fro armcores
> - add CLK_IGNORE_UNUSED tag for cs_dbg, pclk_dgb_pre and pclk_rkpwm
>
> Changes in v2:
> - get some clock ID back
> - add CLK_IGNORE_UNUSED tag for aclk_strc and aclk_core in clk-rk3188.c
> - add CLK_IGNORE_UNUSED tag for rk3288 dwc2
>
>  drivers/clk/rockchip/clk-rk3188.c |  36 +++++-----
>  drivers/clk/rockchip/clk-rk3288.c | 140 +++++++++++++++++++-------------------
>  drivers/clk/rockchip/clk.c        |   9 ---
>  3 files changed, 88 insertions(+), 97 deletions(-)

I found that I needed this in order to keep graphics from failing:

-       GATE(ACLK_VIO1_NIU, "aclk_vio1_niu", "aclk_vio1", 0,
RK3288_CLKGATE_CON(15), 12, GFLAGS),
+       GATE(ACLK_VIO1_NIU, "aclk_vio1_niu", "aclk_vio1",
CLK_IGNORE_UNUSED, RK3288_CLKGATE_CON(15), 12, GFLAGS),

Off-list Heiko suggested that maybe VIO0_NIU would be similar.

Should maybe add that as IGNORE for now until we have something
claiming that clock?

-Doug
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