linux-kernel - Re: [PATCH 07/15] twl4030_charger: allow fine control of charger current.

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Date:	Mon, 2 Mar 2015 22:05:01 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neilb@...e.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 07/15] twl4030_charger: allow fine control of charger
 current.

Hi!

> +	/* ichg values in uA. If any are 'large', we set CGAIN to
> +	 * '1' which doubles the range for half the precision.
> +	 */
> +	int			ichg_eoc, ichg_lo, ichg_hi, cur;

We should really get uA_t.

[Plus, this is not kernel comment style, but...]

> +	/* For ichg_eoc, reg value must be 100XXXX000, we only
> +	 * set the XXXX in high nibble.
> +	 */

Confused. High nibble is 0xf0, right?

> +	/* And finally, set the current.  This is stored in
> +	 * two registers. */
> +	reg = ua2regval(bci->cur, cgain);
> +	/* we have only 10 bit */

bits

> @@ -562,6 +698,14 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
>  	if (!pdata)
>  		pdata = twl4030_bci_parse_dt(&pdev->dev);
>  
> +	bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
> +	bci->ichg_lo = 241000; /* low threshold */

Low

> +	bci->ichg_hi = 500000; /* High threshold */

Acked-by: Pavel Machek <pavel@....cz>

-- 
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