linux-kernel - [PATCH 5/8] drivers/mfd: ADD PWM lookup table for CRC PMIC based PWM

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Date:	Wed, 29 Apr 2015 19:30:02 +0530
From:	Shobhit Kumar <shobhit.kumar@...el.com>
To:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-gpio <linux-gpio@...r.kernel.org>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	David Airlie <airlied@...ux.ie>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Povilas Staniulis <wdmonster@...il.com>,
	Chih-Wei Huang <cwhuang@...roid-x86.org>,
	Shobhit Kumar <shobhit.kumar@...el.com>
Subject: [PATCH 5/8] drivers/mfd: ADD PWM lookup table for CRC PMIC based PWM

On some BYT PLatform the PWM is controlled using CRC PMIC. Add a lookup
entry for the same to be used by the consumer (Intel GFX)

v2: Remove the lookup table on driver unload (Thierry)

CC: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Alexandre Courbot <gnurou@...il.com>
Cc: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@...el.com>
---
 drivers/mfd/intel_soc_pmic_core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c
index f3d918e..a00ddd9 100644
--- a/drivers/mfd/intel_soc_pmic_core.c
+++ b/drivers/mfd/intel_soc_pmic_core.c
@@ -25,6 +25,7 @@
 #include <linux/regmap.h>
 #include <linux/mfd/intel_soc_pmic.h>
 #include <linux/gpio/machine.h>
+#include <linux/pwm.h>
 #include "intel_soc_pmic_core.h"
 
 /* Lookup table for the Panel Enable/Disable line as GPIO signals */
@@ -37,6 +38,11 @@ static struct gpiod_lookup_table panel_gpio_table = {
 	},
 };
 
+/* PWM consumed by the Intel GFX */
+static struct pwm_lookup crc_pwm_lookup[] = {
+	PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
+};
+
 static int intel_soc_pmic_find_gpio_irq(struct device *dev)
 {
 	struct gpio_desc *desc;
@@ -99,6 +105,9 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
 	/* Add lookup table binding for Panel Control to the GPIO Chip */
 	gpiod_add_lookup_table(&panel_gpio_table);
 
+	/* Add lookup table for crc-pwm */
+	pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
+
 	ret = mfd_add_devices(dev, -1, config->cell_dev,
 			      config->n_cell_devs, NULL, 0,
 			      regmap_irq_get_domain(pmic->irq_chip_data));
@@ -121,6 +130,9 @@ static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 	/* Remove lookup table for Panel Control from the GPIO Chip */
 	gpiod_remove_lookup_table(&panel_gpio_table);
 
+	/* remove crc-pwm lookup table */
+	pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
+
 	mfd_remove_devices(&i2c->dev);
 
 	return 0;
-- 
2.1.0

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