linux-kernel - Re: [PATCH v3 06/16] ARM: davinci: da850: use clk->set

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Message-ID: <570B813A.1030907@ti.com>
Date:	Mon, 11 Apr 2016 16:19:30 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	David Lechner <david@...hnology.com>
CC:	<petr@...ix.com>, <sergei.shtylyov@...entembedded.com>,
	<David.Laight@...LAB.COM>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...nel.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>, Bin Liu <b-liu@...com>,
	Lee Jones <lee.jones@...aro.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	"open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 06/16] ARM: davinci: da850: use clk->set_parent for
 async3

On Friday 25 March 2016 05:21 AM, David Lechner wrote:
> The da850 family of processors has an async3 clock domain that can be
> muxed to either pll0_sysclk2 or pll1_sysclk2. Now that the davinci clocks
> have a set_parent callback, we can use this to control the async3 mux
> instead of a stand-alone function.
> 
> This adds a new async3_clk and sets the appropriate child clocks. The
> default is use to pll1_sysclk2 since it is not affected by processor
> frequency scaling.
> 
> Signed-off-by: David Lechner <david@...hnology.com>

> +static int da850_async3_set_parent(struct clk *clk, struct clk *parent)
> +{
> +	u32 val;
> +
> +	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG));
> +
> +	/* Set the Async3 clock domain mux based on the parent clock. */
> +	if (parent == &pll0_sysclk2)
> +		val &= ~CFGCHIP3_ASYNC3_CLKSRC;
> +	else if (parent == &pll1_sysclk2)
> +		val |= CFGCHIP3_ASYNC3_CLKSRC;
> +	else {
> +		pr_err("Bad parent on async3 clock mux.\n");
> +		return -EINVAL;
> +	}

Since else has braces, need braces on all arm of the if-else construct.

Applied this patch with this fixed locally. checkpatch complains about
this too when --strict option is passed.

Thanks,
Sekhar