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pwm: Add PWM driver for OMAP using dual-mode timers

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Adds support for using a OMAP dual-mode timer with PWM capability
as a Linux PWM device. The driver controls the timer by using the
dmtimer API.

Add a platform_data structure for each pwm-omap-dmtimer nodes containing
the dmtimers functions in order to get driver not rely on platform
specific functions.

Cc: Grant Erickson <marathon96@gmail.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Joachim Eastwood <manabian@gmail.com>
Suggested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Tony Lindgren <tony@atomide.com>
[thierry.reding@gmail.com: coding style bikeshed, fix timer leak]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Neil Armstrong
2015-11-02 12:14:21 +01:00
committed by Thierry Reding
parent 72c16a9f98
commit 6604c6556d
5 changed files with 424 additions and 0 deletions
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69
include/linux/platform_data/pwm_omap_dmtimer.h Normal file
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/*
* include/linux/platform_data/pwm_omap_dmtimer.h
*
* OMAP Dual-Mode Timer PWM platform data
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
* Tarun Kanti DebBarma <tarun.kanti@ti.com>
* Thara Gopinath <thara@ti.com>
*
* Platform device conversion and hwmod support.
*
* Copyright (C) 2005 Nokia Corporation
* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
* PWM and clock framework support by Timo Teras.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __PWM_OMAP_DMTIMER_PDATA_H
#define __PWM_OMAP_DMTIMER_PDATA_H
/* trigger types */
#define PWM_OMAP_DMTIMER_TRIGGER_NONE 0x00
#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW 0x01
#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
struct omap_dm_timer;
typedef struct omap_dm_timer pwm_omap_dmtimer;
struct pwm_omap_dmtimer_pdata {
pwm_omap_dmtimer *(*request_by_node)(struct device_node *np);
int (*free)(pwm_omap_dmtimer *timer);
void (*enable)(pwm_omap_dmtimer *timer);
void (*disable)(pwm_omap_dmtimer *timer);
struct clk *(*get_fclk)(pwm_omap_dmtimer *timer);
int (*start)(pwm_omap_dmtimer *timer);
int (*stop)(pwm_omap_dmtimer *timer);
int (*set_load)(pwm_omap_dmtimer *timer, int autoreload,
unsigned int value);
int (*set_match)(pwm_omap_dmtimer *timer, int enable,
unsigned int match);
int (*set_pwm)(pwm_omap_dmtimer *timer, int def_on,
int toggle, int trigger);
int (*set_prescaler)(pwm_omap_dmtimer *timer, int prescaler);
int (*write_counter)(pwm_omap_dmtimer *timer, unsigned int value);
};
#endif /* __PWM_OMAP_DMTIMER_PDATA_H */