linux-kernel - Re: [PATCH v2 2/4] ARM: imx: clk-vf610: fix FlexCAN clock gating

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Date:	Mon, 14 Jul 2014 22:02:24 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Stefan Agner <stefan@...er.ch>
CC:	<mkl@...gutronix.de>, <kernel@...gutronix.de>,
	Jingchang Lu <b35083@...escale.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] ARM: imx: clk-vf610: fix FlexCAN clock gating

On Mon, Jul 14, 2014 at 03:55:29PM +0200, Stefan Agner wrote:
> There are two enable (gates) bits to enable the FlexCAN clocks: the
> first is in the divider register, the second in the clock gate register.
> For most clocks there is a divider in between, then it looks like this:
> 
> clk[VF610_CLK_ESDHC0_SEL] = imx_clk_mux("esdhc0_sel", CCM_CSCMR1, 16, 2,
> esdhc_sels, 4);
> clk[VF610_CLK_ESDHC0_EN] = imx_clk_gate("esdhc0_en", "esdhc0_sel",
> CCM_CSCDR2, 28);
> clk[VF610_CLK_ESDHC0_DIV] = imx_clk_divider("esdhc0_div", "esdhc0_en",
> CCM_CSCDR2, 16, 4);
> clk[VF610_CLK_ESDHC0] = imx_clk_gate2("eshc0", "esdhc0_div", CCM_CCGR7,
> CCM_CCGRx_CGn(1));
> 
> However, for FlexCAN no clock selection and no divider is available,
> hence its just a chain of an enable and gate register...

Ah, okay.  Thanks for the explanation.

Shawn
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