linux-kernel - Re: [PATCH] clk: imx: fix ahb clock mux 1

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Message-ID: <20160503083253.GC5874@tiger>
Date:	Tue, 3 May 2016 16:32:53 +0800
From:	Shawn Guo <shawnguo@...nel.org>
To:	Stefan Agner <stefan@...er.ch>, Anson Huang <b20788@...escale.com>,
	Adrian Alonso <aalonso@...escale.com>,
	Frank Li <Frank.Li@...escale.com>
Cc:	kernel@...gutronix.de, mturquette@...libre.com,
	sboyd@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: fix ahb clock mux 1

On Thu, Apr 28, 2016 at 02:07:03PM -0700, Stefan Agner wrote:
> The clock parent of the AHB root clock when using mux option 1
> is the SYS PLL 270MHz clock. This is specified in  Table 5-11
> Clock Root Table of the i.MX 7Dual Applications Processor
> Reference Manual.
> 
> While it could be a documentation error, the 270MHz parent is
> also mentioned in the boot ROM configuration in Table 6-28: The
> clock is by default at 135MHz due to a POST_PODF value of 1
> (=> divider of 2).
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Anson, Frank,

Can you guys confirm this change is correct?

Shawn

> ---
> Hi Shawn,
> 
> I did not found a clock which was based on this clock which I
> could measure externally... But the change is backed by the
> documentation.
> 
> --
> Stefan
> 
>  drivers/clk/imx/clk-imx7d.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
> index 7912be8..5229968 100644
> --- a/drivers/clk/imx/clk-imx7d.c
> +++ b/drivers/clk/imx/clk-imx7d.c
> @@ -56,7 +56,7 @@ static const char *nand_usdhc_bus_sel[] = { "osc", "pll_sys_pfd2_270m_clk",
>  	"pll_sys_pfd2_135m_clk", "pll_sys_pfd6_clk", "pll_enet_250m_clk",
>  	"pll_audio_main_clk", };
>  
> -static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_135m_clk",
> +static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_270m_clk",
>  	"pll_dram_533m_clk", "pll_sys_pfd0_392m_clk",
>  	"pll_enet_125m_clk", "pll_usb_main_clk", "pll_audio_main_clk",
>  	"pll_video_main_clk", };
> -- 
> 2.8.0
> 
>