linux-kernel - Re: [PATCH v2 01/13] clk: davinci

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Date:	Thu, 11 Oct 2012 16:33:58 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Murali Karicheri <m-karicheri2@...com>
CC:	<mturquette@...aro.org>, <arnd@...db.de>,
	<akpm@...ux-foundation.org>, <shawn.guo@...aro.org>,
	<rob.herring@...xeda.com>, <linus.walleij@...aro.org>,
	<viresh.linux@...il.com>, <linux-kernel@...r.kernel.org>,
	<khilman@...com>, <linux@....linux.org.uk>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-keystone@...t.ti.com>, <linux-c6x-dev@...ux-c6x.org>,
	<cyril@...com>
Subject: Re: [PATCH v2 01/13] clk: davinci - add Main PLL clock driver

On 9/26/2012 11:40 PM, Murali Karicheri wrote:

> +struct clk_davinci_pll_data {
> +	/* physical addresses set by platform code */
> +	u32 phy_pllm;
> +	/* if PLL has a prediv register this should be non zero */
> +	u32 phy_prediv;
> +	/* if PLL has a postdiv register this should be non zero */
> +	u32 phy_postdiv;

"phys" is typically used for physical addresses. I couldn't immediately
related this to physical address when I looked at this variable outside
of this file.

Also, physical addresses should be of type phys_addr_t.

> +	/* mapped addresses. should be initialized by  */
> +	void __iomem *pllm;
> +	void __iomem *prediv;
> +	void __iomem *postdiv;
> +	u32 pllm_mask;
> +	u32 prediv_mask;
> +	u32 postdiv_mask;
> +	u32 num;

Wondering what num is for? May be it will be clear once you document the
complete structure as Linus suggested.

> +	/* framework flags */
> +	u32 flags;
> +	/* pll flags */
> +	u32 pll_flags;
> +       /* use this value for prediv */
> +	u32 fixed_prediv;

Why is this called "fixed". Isn't this the pre-divider value that user
can configure? Also, shouldn't there be a post-divider value that you
need as well.

> +	/* multiply PLLM by this factor. By default most SOC set this to zero
> +	 * that translates to a multiplier of 1 and incrementer of 1.
> +	 * To override default, set this factor
> +	 */
> +	u32 pllm_multiplier;

'm' in pllm stands for multiplier. So, instead of calling it
"pllm_multiplier", call it "pllm_val" instead?

Sorry about late comments on this, looks like I missed looking at this
structure altogether yesterday and had to go back to this only when I
tried understanding whats going on in 4/13

Thanks,
Sekhar
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