linux-kernel - Re: [PATCH v3 3/3] pwm: New driver to support PWM driven LEDs on TWL4030/6030 series of PMICs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <50AB6F63.9040009@ti.com>
Date:	Tue, 20 Nov 2012 12:54:11 +0100
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
CC:	Tero Kristo <t-kristo@...com>,
	Grazvydas Ignotas <notasas@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 3/3] pwm: New driver to support PWM driven LEDs on
 TWL4030/6030 series of PMICs

On 11/20/2012 10:56 AM, Peter Ujfalusi wrote:
> The driver supports the following LED outputs as generic PWM driver:
> TWL4030 LEDA and LEDB (PWMA and PWMB)
> TWL6030 Charging indicator LED (PWM LED)
> 
> On TWL6030 when the PWM requested LED is configured to be controlled by SW.
> In this case the user can enable/disable and set the duty period freely.
> When the PWM has been freed, the LED driver is put back to HW control.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>  drivers/pwm/Kconfig       |  10 ++
>  drivers/pwm/Makefile      |   1 +
>  drivers/pwm/pwm-twl-led.c | 303 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 314 insertions(+)
>  create mode 100644 drivers/pwm/pwm-twl-led.c

...

> +static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
> +			      int duty_ns, int period_ns)
> +{
> +	int duty_cycle = DIV_ROUND_UP(duty_ns * TWL4030_LED_MAX, period_ns);
> +	u8 pwm_config[2] = {1, 0};
> +	int base, ret;
> +
> +	/*
> +	 * To configure the duty period:
> +	 * On-cycle is set to 1 (the minimum allowed value)
> +	 * The off time of 0 is not configurable, so the mapping is:
> +	 * 0 -> off cycle = 2,
> +	 * 1 -> off cycle = 2,
> +	 * 2 -> off cycle = 3,
> +	 * 125 - > off cycle 127,
> +	 * 126 - > off cycle 1

Oh, I missed to save the updated comment before I commited the change.
Can I just send and update patch instead of the whole series again?

> +	 * When on cycle == off cycle the PWM will be always on
> +	 */


-- 
Péter
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/