linux-kernel - Re: [PATCH] clk: qcom: Add missing clock at index GCC_XO

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Message-ID: <1392882243.17130.75.camel@iivanov-dev>
Date:	Thu, 20 Feb 2014 09:44:03 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: Add missing clock at index GCC_XO_CLK for
 MSM8974

On Wed, 2014-02-19 at 12:17 -0800, Stephen Boyd wrote: 
> On 02/19, Ivan T. Ivanov wrote:
> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > 
> > Accessing GCC on MSM8974 trough <&gcc GCC_XO_CLK> lead to NULL
> 
> s/trough/through/
> 
> > pointer dereference. Fix this.
> > 
> 
> I think you want to get the XO clock from the not yet upstreamed
> RPM clock driver. This #define is for a gate that is internal to
> the SoC sitting between the pin for XO and all downstream users
> of the XO clock within the SoC. Futhermore, linux is not allowed
> to control this gate because it's essential to the entire system.
> 
> This patch will work for now but we'll need to change the DTS in
> the future to get the clock from the RPM node and then revert
> this patch.
> 
> It may be better to just move the XO and sleep_clk_src clocks to
> DT and make them fixed-rate clocks that get added by
> of_clk_init(). Then when the RPM node is added we can remove the
> XO node and update the usb node at the same time.


I see. I'll leave you to decide what is the right solution here,

Regards,
Ivan


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