[PATCH v2 00/10] Revamp Semtech SX150x driver

[PATCH v2 00/10] Revamp Semtech SX150x driver

[Andrey Smirnov]

Hello everyone,

This is the second version of the patchset originally submitted here:

http://www.spinics.net/lists/devicetree/msg146176.html

The only change since v1 is that, per Rob Herring's recommendation, all
of the changes to bindings documentation were coalesced into a single patch.

Thank you,
Andrey Smirnov

Andrey Smirnov (10):
  gpio-sx150x: Remove 'gpio_base' from pdata
  gpio-sx150x: Remove 'irq_summary' parameter
  gpio-sx150x: Remove 'irq_base' parameter
  gpio-sx150x: Replace 'io_polarity' with DT binding
  gpio-sx150x: Replace "io_pull*_ena" with DT bindings
  gpio-sx150x: Replace 'reset_during_probe" with DT binding
  gpio-sx150x: Replace 'oscio_is_gpio' with DT binding
  gpio-sx150x: Remove struct sx150x_platform_data
  gpio-sx150x: Pass device type in DT match table
  bindings: gpio-sx150x: Document new bindings

 .../devicetree/bindings/gpio/gpio-sx150x.txt       |  29 ++++
 drivers/gpio/gpio-sx150x.c                         | 184 +++++++++------------
 2 files changed, 105 insertions(+), 108 deletions(-)

-- 
2.5.5

[PATCH v2 01/10] gpio-sx150x: Remove 'gpio_base' from pdata

[Andrey Smirnov]

Since struct sx150x_platrfom_data is not accesible to anyone but the
driver itself it seems a bit pointless to have a configurable GPIO
base. Hardcode it to -1 and remove that paramter.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index a177ebd..f9d6bec 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -86,11 +86,6 @@ struct sx150x_device_data {
 
 /**
  * struct sx150x_platform_data - config data for SX150x driver
- * @gpio_base: The index number of the first GPIO assigned to this
- *             GPIO expander.  The expander will create a block of
- *             consecutively numbered gpios beginning at the given base,
- *             with the size of the block depending on the model of the
- *             expander chip.
  * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
  *                instead of as an oscillator, increasing the size of the
  *                GP(I)O pool created by this expander by one.  The
@@ -125,7 +120,6 @@ struct sx150x_device_data {
  *                      in order to place it in a known state.
  */
 struct sx150x_platform_data {
-	unsigned gpio_base;
 	bool     oscio_is_gpo;
 	u16      io_pullup_ena;
 	u16      io_pulldn_ena;
@@ -588,7 +582,7 @@ static void sx150x_init_chip(struct sx150x_chip *chip,
 	chip->gpio_chip.get              = sx150x_gpio_get;
 	chip->gpio_chip.set              = sx150x_gpio_set;
 	chip->gpio_chip.set_single_ended = sx150x_gpio_set_single_ended;
-	chip->gpio_chip.base             = pdata->gpio_base;
+	chip->gpio_chip.base             = -1;
 	chip->gpio_chip.can_sleep        = true;
 	chip->gpio_chip.ngpio            = chip->dev_cfg->ngpios;
 #ifdef CONFIG_OF_GPIO
-- 
2.5.5

[PATCH v2 02/10] gpio-sx150x: Remove 'irq_summary' parameter

[Andrey Smirnov]

Information conveyed by 'irq_summary' paramter can be obtained from
struct i2c_client's irq field. Remove any uses of the former and replace
it with the latter.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index f9d6bec..e80c115 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -105,12 +105,6 @@ struct sx150x_device_data {
  *               the polarity of that IO line, while clearing it results
  *               in normal polarity. For chips with fewer than 16 IO pins,
  *               high-end bits are ignored.
- * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
- *               is connected, via which it reports interrupt events
- *               across all GPIO lines.  This must be a real,
- *               pre-existing IRQ line.
- *               Setting this value < 0 disables the irq_chip functionality
- *               of the driver.
  * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
  *            IRQ lines will appear.  Similarly to gpio_base, the expander
  *            will create a block of irqs beginning at this number.
@@ -124,7 +118,6 @@ struct sx150x_platform_data {
 	u16      io_pullup_ena;
 	u16      io_pulldn_ena;
 	u16      io_polarity;
-	int      irq_summary;
 	unsigned irq_base;
 	bool     reset_during_probe;
 };
@@ -133,7 +126,6 @@ struct sx150x_chip {
 	struct gpio_chip                 gpio_chip;
 	struct i2c_client               *client;
 	const struct sx150x_device_data *dev_cfg;
-	int                              irq_summary;
 	int                              irq_base;
 	int				 irq_update;
 	u32                              irq_sense;
@@ -598,7 +590,6 @@ static void sx150x_init_chip(struct sx150x_chip *chip,
 	chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
 	chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
 	chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
-	chip->irq_summary                  = -1;
 	chip->irq_base                     = -1;
 	chip->irq_masked                   = ~0;
 	chip->irq_sense                    = 0;
@@ -699,12 +690,10 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 }
 
 static int sx150x_install_irq_chip(struct sx150x_chip *chip,
-				int irq_summary,
-				int irq_base)
+				   int irq_base)
 {
 	int err;
 
-	chip->irq_summary = irq_summary;
 	chip->irq_base    = irq_base;
 
 	/* Add gpio chip to irq subsystem */
@@ -718,11 +707,10 @@ static int sx150x_install_irq_chip(struct sx150x_chip *chip,
 	}
 
 	err = devm_request_threaded_irq(&chip->client->dev,
-			irq_summary, NULL, sx150x_irq_thread_fn,
+			chip->client->irq, NULL, sx150x_irq_thread_fn,
 			IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
 			chip->irq_chip.name, chip);
 	if (err < 0) {
-		chip->irq_summary = -1;
 		chip->irq_base    = -1;
 	}
 
@@ -759,9 +747,8 @@ static int sx150x_probe(struct i2c_client *client,
 	if (rc)
 		return rc;
 
-	if (pdata->irq_summary >= 0) {
+	if (client->irq) {
 		rc = sx150x_install_irq_chip(chip,
-					pdata->irq_summary,
 					pdata->irq_base);
 		if (rc < 0)
 			return rc;
-- 
2.5.5

[PATCH v2 03/10] gpio-sx150x: Remove 'irq_base' parameter

[Andrey Smirnov]

Remove 'irq_base' parameter and call 'gpiochip_irqchip_add' with '0' as
irq base to automatically assign it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index e80c115..e01afd8 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -105,10 +105,6 @@ struct sx150x_device_data {
  *               the polarity of that IO line, while clearing it results
  *               in normal polarity. For chips with fewer than 16 IO pins,
  *               high-end bits are ignored.
- * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
- *            IRQ lines will appear.  Similarly to gpio_base, the expander
- *            will create a block of irqs beginning at this number.
- *            This value is ignored if irq_summary is < 0.
  * @reset_during_probe: If set to true, the driver will trigger a full
  *                      reset of the chip at the beginning of the probe
  *                      in order to place it in a known state.
@@ -118,7 +114,6 @@ struct sx150x_platform_data {
 	u16      io_pullup_ena;
 	u16      io_pulldn_ena;
 	u16      io_polarity;
-	unsigned irq_base;
 	bool     reset_during_probe;
 };
 
@@ -126,7 +121,6 @@ struct sx150x_chip {
 	struct gpio_chip                 gpio_chip;
 	struct i2c_client               *client;
 	const struct sx150x_device_data *dev_cfg;
-	int                              irq_base;
 	int				 irq_update;
 	u32                              irq_sense;
 	u32				 irq_masked;
@@ -590,7 +584,6 @@ static void sx150x_init_chip(struct sx150x_chip *chip,
 	chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
 	chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
 	chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
-	chip->irq_base                     = -1;
 	chip->irq_masked                   = ~0;
 	chip->irq_sense                    = 0;
 	chip->dev_masked                   = ~0;
@@ -689,16 +682,13 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 	return err;
 }
 
-static int sx150x_install_irq_chip(struct sx150x_chip *chip,
-				   int irq_base)
+static int sx150x_install_irq_chip(struct sx150x_chip *chip)
 {
 	int err;
 
-	chip->irq_base    = irq_base;
-
 	/* Add gpio chip to irq subsystem */
 	err = gpiochip_irqchip_add(&chip->gpio_chip,
-		&chip->irq_chip, chip->irq_base,
+		&chip->irq_chip, 0,
 		handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
 	if (err) {
 		dev_err(&chip->client->dev,
@@ -710,10 +700,6 @@ static int sx150x_install_irq_chip(struct sx150x_chip *chip,
 			chip->client->irq, NULL, sx150x_irq_thread_fn,
 			IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
 			chip->irq_chip.name, chip);
-	if (err < 0) {
-		chip->irq_base    = -1;
-	}
-
 	return err;
 }
 
@@ -748,8 +734,7 @@ static int sx150x_probe(struct i2c_client *client,
 		return rc;
 
 	if (client->irq) {
-		rc = sx150x_install_irq_chip(chip,
-					pdata->irq_base);
+		rc = sx150x_install_irq_chip(chip);
 		if (rc < 0)
 			return rc;
 	}
-- 
2.5.5

[PATCH v2 04/10] gpio-sx150x: Replace 'io_polarity' with DT binding

[Andrey Smirnov]

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index e01afd8..9b62133 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -100,11 +100,6 @@ struct sx150x_device_data {
  *                 bit at position n will enable the pull-down for the IO at
  *                 the corresponding offset.  For chips with fewer than
  *                 16 IO pins, high-end bits are ignored.
- * @io_polarity: A bit-mask which enables polarity inversion for each IO line
- *               in the expander.  Setting the bit at position n inverts
- *               the polarity of that IO line, while clearing it results
- *               in normal polarity. For chips with fewer than 16 IO pins,
- *               high-end bits are ignored.
  * @reset_during_probe: If set to true, the driver will trigger a full
  *                      reset of the chip at the beginning of the probe
  *                      in order to place it in a known state.
@@ -113,7 +108,6 @@ struct sx150x_platform_data {
 	bool     oscio_is_gpo;
 	u16      io_pullup_ena;
 	u16      io_pulldn_ena;
-	u16      io_polarity;
 	bool     reset_during_probe;
 };
 
@@ -654,9 +648,15 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 		return err;
 
 	if (chip->dev_cfg->model == SX150X_789) {
+		u32 io_polarity = 0;
+
+		of_property_read_u32(chip->client->dev.of_node,
+				     "semtech,io-polarity",
+				     &io_polarity);
+
 		err = sx150x_init_io(chip,
-				chip->dev_cfg->pri.x789.reg_polarity,
-				pdata->io_polarity);
+				     chip->dev_cfg->pri.x789.reg_polarity,
+				     (u16)io_polarity);
 		if (err < 0)
 			return err;
 	} else if (chip->dev_cfg->model == SX150X_456) {
-- 
2.5.5

[PATCH v2 05/10] gpio-sx150x: Replace "io_pull*_ena" with DT bindings

[Andrey Smirnov]

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index 9b62133..b751ff9 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -90,24 +90,12 @@ struct sx150x_device_data {
  *                instead of as an oscillator, increasing the size of the
  *                GP(I)O pool created by this expander by one.  The
  *                output-only GPO pin will be added at the end of the block.
- * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
- *                 for each IO line in the expander.  Setting the bit at
- *                 position n will enable the pull-up for the IO at
- *                 the corresponding offset.  For chips with fewer than
- *                 16 IO pins, high-end bits are ignored.
- * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
- *                 resistor for each IO line in the expander. Setting the
- *                 bit at position n will enable the pull-down for the IO at
- *                 the corresponding offset.  For chips with fewer than
- *                 16 IO pins, high-end bits are ignored.
  * @reset_during_probe: If set to true, the driver will trigger a full
  *                      reset of the chip at the beginning of the probe
  *                      in order to place it in a known state.
  */
 struct sx150x_platform_data {
 	bool     oscio_is_gpo;
-	u16      io_pullup_ena;
-	u16      io_pulldn_ena;
 	bool     reset_during_probe;
 };
 
@@ -614,6 +602,8 @@ static int sx150x_reset(struct sx150x_chip *chip)
 static int sx150x_init_hw(struct sx150x_chip *chip,
 			struct sx150x_platform_data *pdata)
 {
+	u32 io_pulldown = 0;
+	u32 io_pullup   = 0;
 	int err = 0;
 
 	if (pdata->reset_during_probe) {
@@ -622,6 +612,14 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 			return err;
 	}
 
+	of_property_read_u32(chip->client->dev.of_node,
+			     "semtech,io-pullup",
+			     &io_pullup);
+
+	of_property_read_u32(chip->client->dev.of_node,
+			     "semtech,io-pulldown",
+			     &io_pulldown);
+
 	if (chip->dev_cfg->model == SX150X_789)
 		err = sx150x_i2c_write(chip->client,
 				chip->dev_cfg->pri.x789.reg_misc,
@@ -638,12 +636,12 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 		return err;
 
 	err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
-			pdata->io_pullup_ena);
+			     io_pullup);
 	if (err < 0)
 		return err;
 
 	err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
-			pdata->io_pulldn_ena);
+			     io_pulldown);
 	if (err < 0)
 		return err;
 
-- 
2.5.5

[PATCH v2 06/10] gpio-sx150x: Replace 'reset_during_probe" with DT binding

[Andrey Smirnov]

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index b751ff9..a63f6ea 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -90,13 +90,9 @@ struct sx150x_device_data {
  *                instead of as an oscillator, increasing the size of the
  *                GP(I)O pool created by this expander by one.  The
  *                output-only GPO pin will be added at the end of the block.
- * @reset_during_probe: If set to true, the driver will trigger a full
- *                      reset of the chip at the beginning of the probe
- *                      in order to place it in a known state.
  */
 struct sx150x_platform_data {
 	bool     oscio_is_gpo;
-	bool     reset_during_probe;
 };
 
 struct sx150x_chip {
@@ -606,7 +602,8 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 	u32 io_pullup   = 0;
 	int err = 0;
 
-	if (pdata->reset_during_probe) {
+	if (of_property_read_bool(chip->client->dev.of_node,
+				  "semtech,reset-during-probe")) {
 		err = sx150x_reset(chip);
 		if (err < 0)
 			return err;
-- 
2.5.5

[PATCH v2 07/10] gpio-sx150x: Replace 'oscio_is_gpio' with DT binding

[Andrey Smirnov]

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index a63f6ea..044ff3d 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -92,7 +92,6 @@ struct sx150x_device_data {
  *                output-only GPO pin will be added at the end of the block.
  */
 struct sx150x_platform_data {
-	bool     oscio_is_gpo;
 };
 
 struct sx150x_chip {
@@ -553,8 +552,6 @@ static void sx150x_init_chip(struct sx150x_chip *chip,
 	chip->gpio_chip.of_node          = client->dev.of_node;
 	chip->gpio_chip.of_gpio_n_cells  = 2;
 #endif
-	if (pdata->oscio_is_gpo)
-		++chip->gpio_chip.ngpio;
 
 	chip->irq_chip.name                = client->name;
 	chip->irq_chip.irq_mask            = sx150x_irq_mask;
@@ -670,10 +667,6 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
 			return err;
 	}
 
-
-	if (pdata->oscio_is_gpo)
-		sx150x_set_oscio(chip, 0);
-
 	return err;
 }
 
@@ -706,6 +699,7 @@ static int sx150x_probe(struct i2c_client *client,
 	struct sx150x_platform_data *pdata;
 	struct sx150x_chip *chip;
 	int rc;
+	bool oscio_is_gpo;
 
 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata)
@@ -719,11 +713,21 @@ static int sx150x_probe(struct i2c_client *client,
 	if (!chip)
 		return -ENOMEM;
 
+	oscio_is_gpo = of_property_read_bool(client->dev.of_node,
+					     "semtech,oscio-is-gpo");
+
 	sx150x_init_chip(chip, client, id->driver_data, pdata);
+
+	if (oscio_is_gpo)
+		chip->gpio_chip.ngpio++;
+
 	rc = sx150x_init_hw(chip, pdata);
 	if (rc < 0)
 		return rc;
 
+	if (oscio_is_gpo)
+		sx150x_set_oscio(chip, 0);
+
 	rc = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 	if (rc)
 		return rc;
-- 
2.5.5

[PATCH v2 08/10] gpio-sx150x: Remove struct sx150x_platform_data

[Andrey Smirnov]

Remove last vestiges of struct sx150x_platform_data

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 25 ++++---------------------
 1 file changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index 044ff3d..bfb1ec3 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -84,16 +84,6 @@ struct sx150x_device_data {
 	} pri;
 };
 
-/**
- * struct sx150x_platform_data - config data for SX150x driver
- * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
- *                instead of as an oscillator, increasing the size of the
- *                GP(I)O pool created by this expander by one.  The
- *                output-only GPO pin will be added at the end of the block.
- */
-struct sx150x_platform_data {
-};
-
 struct sx150x_chip {
 	struct gpio_chip                 gpio_chip;
 	struct i2c_client               *client;
@@ -531,8 +521,7 @@ out:
 
 static void sx150x_init_chip(struct sx150x_chip *chip,
 			struct i2c_client *client,
-			kernel_ulong_t driver_data,
-			struct sx150x_platform_data *pdata)
+			kernel_ulong_t driver_data)
 {
 	mutex_init(&chip->lock);
 
@@ -592,8 +581,7 @@ static int sx150x_reset(struct sx150x_chip *chip)
 	return err;
 }
 
-static int sx150x_init_hw(struct sx150x_chip *chip,
-			struct sx150x_platform_data *pdata)
+static int sx150x_init_hw(struct sx150x_chip *chip)
 {
 	u32 io_pulldown = 0;
 	u32 io_pullup   = 0;
@@ -696,15 +684,10 @@ static int sx150x_probe(struct i2c_client *client,
 {
 	static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
 				     I2C_FUNC_SMBUS_WRITE_WORD_DATA;
-	struct sx150x_platform_data *pdata;
 	struct sx150x_chip *chip;
 	int rc;
 	bool oscio_is_gpo;
 
-	pdata = dev_get_platdata(&client->dev);
-	if (!pdata)
-		return -EINVAL;
-
 	if (!i2c_check_functionality(client->adapter, i2c_funcs))
 		return -ENOSYS;
 
@@ -716,12 +699,12 @@ static int sx150x_probe(struct i2c_client *client,
 	oscio_is_gpo = of_property_read_bool(client->dev.of_node,
 					     "semtech,oscio-is-gpo");
 
-	sx150x_init_chip(chip, client, id->driver_data, pdata);
+	sx150x_init_chip(chip, client, id->driver_data);
 
 	if (oscio_is_gpo)
 		chip->gpio_chip.ngpio++;
 
-	rc = sx150x_init_hw(chip, pdata);
+	rc = sx150x_init_hw(chip);
 	if (rc < 0)
 		return rc;
 
-- 
2.5.5

[PATCH v2 09/10] gpio-sx150x: Pass device type in DT match table

[Andrey Smirnov]

Pass the same device type information in DT match table as the one being
passed via i2c_device_id

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/gpio/gpio-sx150x.c | 48 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
index bfb1ec3..9263d25 100644
--- a/drivers/gpio/gpio-sx150x.c
+++ b/drivers/gpio/gpio-sx150x.c
@@ -97,8 +97,15 @@ struct sx150x_chip {
 	struct mutex                     lock;
 };
 
+enum sx150x_type {
+	SX1508Q = 0,
+	SX1509Q,
+	SX1506Q,
+	SX1502Q,
+};
+
 static const struct sx150x_device_data sx150x_devices[] = {
-	[0] = { /* sx1508q */
+	[SX1508Q] = {
 		.model = SX150X_789,
 		.reg_pullup	= 0x03,
 		.reg_pulldn	= 0x04,
@@ -116,7 +123,7 @@ static const struct sx150x_device_data sx150x_devices[] = {
 		},
 		.ngpios = 8,
 	},
-	[1] = { /* sx1509q */
+	[SX1509Q] = {
 		.model = SX150X_789,
 		.reg_pullup	= 0x07,
 		.reg_pulldn	= 0x09,
@@ -134,7 +141,7 @@ static const struct sx150x_device_data sx150x_devices[] = {
 		},
 		.ngpios	= 16
 	},
-	[2] = { /* sx1506q */
+	[SX1506Q] = {
 		.model = SX150X_456,
 		.reg_pullup	= 0x05,
 		.reg_pulldn	= 0x07,
@@ -154,7 +161,7 @@ static const struct sx150x_device_data sx150x_devices[] = {
 		},
 		.ngpios	= 16
 	},
-	[3] = { /* sx1502q */
+	[SX1502Q] = {
 		.model = SX150X_123,
 		.reg_pullup	= 0x02,
 		.reg_pulldn	= 0x03,
@@ -177,19 +184,19 @@ static const struct sx150x_device_data sx150x_devices[] = {
 };
 
 static const struct i2c_device_id sx150x_id[] = {
-	{"sx1508q", 0},
-	{"sx1509q", 1},
-	{"sx1506q", 2},
-	{"sx1502q", 3},
+	{ "sx1508q", SX1508Q },
+	{ "sx1509q", SX1509Q },
+	{ "sx1506q", SX1506Q },
+	{ "sx1502q", SX1502Q },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, sx150x_id);
 
 static const struct of_device_id sx150x_of_match[] = {
-	{ .compatible = "semtech,sx1508q" },
-	{ .compatible = "semtech,sx1509q" },
-	{ .compatible = "semtech,sx1506q" },
-	{ .compatible = "semtech,sx1502q" },
+	{ .compatible = "semtech,sx1508q", .data = (void *)SX1508Q },
+	{ .compatible = "semtech,sx1509q", .data = (void *)SX1509Q },
+	{ .compatible = "semtech,sx1506q", .data = (void *)SX1506Q },
+	{ .compatible = "semtech,sx1502q", .data = (void *)SX1502Q },
 	{},
 };
 MODULE_DEVICE_TABLE(of, sx150x_of_match);
@@ -680,13 +687,14 @@ static int sx150x_install_irq_chip(struct sx150x_chip *chip)
 }
 
 static int sx150x_probe(struct i2c_client *client,
-				const struct i2c_device_id *id)
+			const struct i2c_device_id *id)
 {
 	static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
 				     I2C_FUNC_SMBUS_WRITE_WORD_DATA;
 	struct sx150x_chip *chip;
 	int rc;
 	bool oscio_is_gpo;
+	kernel_ulong_t driver_data;
 
 	if (!i2c_check_functionality(client->adapter, i2c_funcs))
 		return -ENOSYS;
@@ -699,7 +707,19 @@ static int sx150x_probe(struct i2c_client *client,
 	oscio_is_gpo = of_property_read_bool(client->dev.of_node,
 					     "semtech,oscio-is-gpo");
 
-	sx150x_init_chip(chip, client, id->driver_data);
+	if (id) {
+		driver_data = id->driver_data;
+	} else {
+		const struct of_device_id *match;
+
+		match = of_match_device(sx150x_of_match, &client->dev);
+		if (!match)
+			return -ENODEV;
+
+		driver_data = (kernel_ulong_t)match->data;
+	}
+
+	sx150x_init_chip(chip, client, driver_data);
 
 	if (oscio_is_gpo)
 		chip->gpio_chip.ngpio++;
-- 
2.5.5

[PATCH v2 10/10] bindings: gpio-sx150x: Document new bindings

[Andrey Smirnov]

This patch documents the conversion of various platform data options
that used to be availible to SX150x driver to device tree/OF form.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 .../devicetree/bindings/gpio/gpio-sx150x.txt       | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt b/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
index c809acb..e96b554 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
@@ -26,6 +26,35 @@ The GPIO expander can optionally be used as an interrupt controller, in
 which case it uses the default two cell specifier as described in
 Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
 
+Optional properties:
+
+- semtech,io-polarity: A bit-mask which enables polarity inversion for
+  		       each IO line in the expander. Setting the bit
+  		       at position n inverts the polarity of that IO
+  		       line, while clearing it results in normal
+  		       polarity. For chips with fewer than 16 IO pins,
+  		       high-end bits are ignored.
+
+- semtech,io-pullup:
+- semtech,io-pulldown: A bit-mask which enables-or disables the
+  		       pull-up (pull-down) resistor for each IO line
+  		       in the expander. Setting the bit at position n
+  		       will enable the pull-down for the IO at the
+  		       corresponding offset.  For chips with fewer
+  		       than 16 IO pins, high-end bits are ignored.
+
+- semtech,reset-during-probe: Boolean, if true, the driver will
+  			      trigger a full reset of the chip at the
+  			      beginning of the probe in order to place
+  			      it in a known state.
+
+- semtech,oscio-is-gpo: Boolean, if set to true, the driver will
+  			configure OSCIO as a GPO instead of as an
+  			oscillator, increasing the size of the GP(I)O
+  			pool created by this expander by one.  The
+  			output-only GPO pin will be added at the end
+  			of the block.
+
 Example:
 
 	i2c_gpio_expander@20{
-- 
2.5.5

Re: [PATCH v2 00/10] Revamp Semtech SX150x driver

[Linus Walleij]

On Wed, Oct 19, 2016 at 4:03 PM, Andrey Smirnov
<andrew.smirnov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Hello everyone,
>
> This is the second version of the patchset originally submitted here:
>
> http://www.spinics.net/lists/devicetree/msg146176.html

I'm sorry about your efforts, and sorry for not having had time to
comment earlier, but this driver will be removed and replaced by
a pin control driver by Neil Armstrong:
http://marc.info/?l=linux-gpio&m=147499137422454&w=2

As you can see it arrived some weeks before.

Can you please review Neils patch and make sure it satisfies
your usecases?

The reason we have to make a pin control driver are things you
can see by the quirky things for line driving or biasing etc
that you have to add if it stays in GPIO: pin control is made
to handle this kind of stuff in a generic way.

Yours,
Linus Walleij
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Re: [PATCH v2 00/10] Revamp Semtech SX150x driver

[Andrey Smirnov]

On Thu, Oct 20, 2016 at 12:08 PM, Linus Walleij
<linus.walleij@linaro.org> wrote:
> On Wed, Oct 19, 2016 at 4:03 PM, Andrey Smirnov
> <andrew.smirnov@gmail.com> wrote:
>
>> Hello everyone,
>>
>> This is the second version of the patchset originally submitted here:
>>
>> http://www.spinics.net/lists/devicetree/msg146176.html
>
> I'm sorry about your efforts, and sorry for not having had time to
> comment earlier, but this driver will be removed and replaced by
> a pin control driver by Neil Armstrong:
> http://marc.info/?l=linux-gpio&m=147499137422454&w=2
>
> As you can see it arrived some weeks before.
>
> Can you please review Neils patch and make sure it satisfies
> your usecases?

Sure, I'll grab those patches and provide comments, Tested-by's, etc.

Thanks,
Andrey Smirnov

Re: [PATCH v2 00/10] Revamp Semtech SX150x driver

[Neil Armstrong]

On 10/20/2016 09:34 PM, Andrey Smirnov wrote:
> On Thu, Oct 20, 2016 at 12:08 PM, Linus Walleij
> <linus.walleij@linaro.org> wrote:
>> On Wed, Oct 19, 2016 at 4:03 PM, Andrey Smirnov
>> <andrew.smirnov@gmail.com> wrote:
>>
>>> Hello everyone,
>>>
>>> This is the second version of the patchset originally submitted here:
>>>
>>> http://www.spinics.net/lists/devicetree/msg146176.html
>>
>> I'm sorry about your efforts, and sorry for not having had time to
>> comment earlier, but this driver will be removed and replaced by
>> a pin control driver by Neil Armstrong:
>> http://marc.info/?l=linux-gpio&m=147499137422454&w=2
>>
>> As you can see it arrived some weeks before.
>>
>> Can you please review Neils patch and make sure it satisfies
>> your usecases?
> 
> Sure, I'll grab those patches and provide comments, Tested-by's, etc.
> 
> Thanks,
> Andrey Smirnov
> 

Hi Andrey,

Please find the v3 patch at https://marc.info/?l=linux-gpio&m=147704101505236&w=2

Maybe it could better to actually add the 1503 support even if it's using the sx1506q_device_data.

Could you try out this driver and report a Tested-by if successful ?

Neil