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leds: pca963x: Add bindings to invert polarity

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Add a new DT property, nxp,inverted-out, to invert the polarity
of the output.

Tested on PCA9634.

Signed-off-by: Anders Darander <anders@chargestorm.se>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Anders Darander 2017-04-27 08:37:33 +02:00 committed by Jacek Anaszewski
parent 2ea659a9ef
commit bb29b9cccd
3 changed files with 22 additions and 2 deletions
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1
Documentation/devicetree/bindings/leds/pca963x.txt
View File

@ -10,6 +10,7 @@ Optional properties:
- nxp,period-scale : In some configurations, the chip blinks faster than expected. - nxp,period-scale : In some configurations, the chip blinks faster than expected.
This parameter provides a scaling ratio (fixed point, decimal divided This parameter provides a scaling ratio (fixed point, decimal divided
by 1000) to compensate, e.g. 1300=1.3x and 750=0.75x. by 1000) to compensate, e.g. 1300=1.3x and 750=0.75x.
- nxp,inverted-out: invert the polarity of the generated PWM
Each led is represented as a sub-node of the nxp,pca963x device. Each led is represented as a sub-node of the nxp,pca963x device.

17
drivers/leds/leds-pca963x.c
View File

@ -342,6 +342,12 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
if (of_property_read_u32(np, "nxp,period-scale", &chip->scaling)) if (of_property_read_u32(np, "nxp,period-scale", &chip->scaling))
chip->scaling = 1000; chip->scaling = 1000;
/* default to non-inverted output, unless inverted is specified */
if (of_property_read_bool(np, "nxp,inverted-out"))
pdata->dir = PCA963X_INVERTED;
else
pdata->dir = PCA963X_NORMAL;
return pdata; return pdata;
} }
@ -452,11 +458,18 @@ static int pca963x_probe(struct i2c_client *client,
i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4)); i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
if (pdata) { if (pdata) {
u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
PCA963X_MODE2);
/* Configure output: open-drain or totem pole (push-pull) */ /* Configure output: open-drain or totem pole (push-pull) */
if (pdata->outdrv == PCA963X_OPEN_DRAIN) if (pdata->outdrv == PCA963X_OPEN_DRAIN)
i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01); mode2 |= 0x01;
else else
i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x05); mode2 |= 0x05;
/* Configure direction: normal or inverted */
if (pdata->dir == PCA963X_INVERTED)
mode2 |= 0x10;
i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
mode2);
} }
return 0; return 0;

6
include/linux/platform_data/leds-pca963x.h
View File

@ -33,10 +33,16 @@ enum pca963x_blink_type {
PCA963X_HW_BLINK, PCA963X_HW_BLINK,
}; };
enum pca963x_direction {
PCA963X_NORMAL,
PCA963X_INVERTED,
};
struct pca963x_platform_data { struct pca963x_platform_data {
struct led_platform_data leds; struct led_platform_data leds;
enum pca963x_outdrv outdrv; enum pca963x_outdrv outdrv;
enum pca963x_blink_type blink_type; enum pca963x_blink_type blink_type;
enum pca963x_direction dir;
}; };
#endif /* __LINUX_PCA963X_H*/ #endif /* __LINUX_PCA963X_H*/