[PATCH v3 0/3] Fix up Nokia 770 regression

[PATCH v3 0/3] Fix up Nokia 770 regression

[Linus Walleij]

A recent change to use dynamic GPIO base allocation in the
OMAP GPIO driver caused a regression in some OMAP1 boards.
This series fixes up the Nokia 770 board from 2005:
https://en.wikipedia.org/wiki/Nokia_770_Internet_Tablet

I don't know how urgent the fix is, you decide. For me,
it is fair if fringe systems get fixed in due time, as
they are hardly anyones main development laptop.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Changes in v3:
- Fix a compile error in the ADS7846 driver by dropping some
  leftover OF ifdeffery.
- Link to v2: https://lore.kernel.org/r/20230430-nokia770-regression-v2-0-984ed3ca5444@linaro.org

Changes in v2:
- Thoroughly rewrote the approach taken for the ADS7846 touchscreen
  following Dmitry's ambition to go a step further and take a swnode
  approach to this conversion: I'm fine with that, the patch just
  get a bit bigger.
- Picked up Ulf's ACK on the MMC patch.
- Link to v1: https://lore.kernel.org/r/20230430-nokia770-regression-v1-0-97704e36b094@linaro.org

---
Linus Walleij (3):
      Input: ads7846 - Convert to use software nodes
      ARM/mmc: Convert old mmci-omap to GPIO descriptors
      ARM: omap1: Fix up the Nokia 770 board device IRQs

 arch/arm/mach-omap1/board-nokia770.c    | 198 +++++++++++++++++++-------------
 arch/arm/mach-omap1/board-sx1-mmc.c     |   1 -
 arch/arm/mach-omap2/board-n8x0.c        |  85 +++++---------
 arch/arm/mach-pxa/spitz.c               |  11 +-
 arch/mips/alchemy/devboards/db1000.c    |  11 +-
 drivers/input/touchscreen/ads7846.c     | 113 +++++++-----------
 drivers/mmc/host/omap.c                 |  46 +++++++-
 drivers/video/fbdev/omap/lcd_mipid.c    |  10 ++
 include/linux/platform_data/lcd-mipid.h |   2 -
 include/linux/platform_data/mmc-omap.h  |   2 -
 include/linux/spi/ads7846.h             |   2 -
 11 files changed, 262 insertions(+), 219 deletions(-)
---
base-commit: 348551ddaf311c76b01cdcbaf61b6fef06a49144
change-id: 20230430-nokia770-regression-2b5a07497ec9

Best regards,
-- 
Linus Walleij <linus.walleij@linaro.org>

[PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Linus Walleij]

The Nokia 770 is using GPIOs from the global numberspace on the
CBUS node to pass down to the LCD controller. This regresses when we
let the OMAP GPIO driver use dynamic GPIO base.

The Nokia 770 now has dynamic allocation of IRQ numbers, so this
needs to be fixed for it to work.

As this is the only user of LCD MIPID we can easily augment the
driver to use a GPIO descriptor instead and resolve the issue.

The platform data .shutdown() callback wasn't even used in the
code, but we encode a shutdown asserting RESET in the remove()
callback for completeness sake.

The CBUS also has the ADS7846 touchscreen attached.

Populate the devices on the Nokia 770 CBUS I2C using software
nodes instead of platform data quirks. This includes the LCD
and the ADS7846 touchscreen so the conversion just brings the LCD
along with it as software nodes is an all-or-nothing design
pattern.

The ADS7846 has some limited support for using GPIO descriptors,
let's convert it over completely to using device properties and then
fix all remaining boardfile users to provide all platform data using
software nodes.

Dump the of includes and of_match_ptr() in the ADS7846 driver as part
of the job.

Since we have to move ADS7846 over to obtaining the GPIOs it is
using exclusively from descriptors, we provide descriptor tables
for the two remaining in-kernel boardfiles using ADS7846:

- PXA Spitz
- MIPS Alchemy DB1000 development board

It was too hard for me to include software node conversion of
these two remaining users at this time: the spitz is using a
hscync callback in the platform data that would require further
GPIO descriptor conversion of the Spitz, and moving the hsync
callback down into the driver: it will just become too big of
a job, but it can be done separately.

The MIPS Alchemy DB1000 is simply something I cannot test, so take
the easier approach of just providing some GPIO descriptors in
this case as I don't want the patch to grow too intrusive.

Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Drop leftover OF ifdefs no longer needed and causing compile
  errors.
---
 arch/arm/mach-omap1/board-nokia770.c    |  98 +++++++++++++++++----------
 arch/arm/mach-pxa/spitz.c               |  11 +++-
 arch/mips/alchemy/devboards/db1000.c    |  11 +++-
 drivers/input/touchscreen/ads7846.c     | 113 ++++++++++++--------------------
 drivers/video/fbdev/omap/lcd_mipid.c    |  10 +++
 include/linux/platform_data/lcd-mipid.h |   2 -
 include/linux/spi/ads7846.h             |   2 -
 7 files changed, 135 insertions(+), 112 deletions(-)

diff --git a/arch/arm/mach-omap1/board-nokia770.c b/arch/arm/mach-omap1/board-nokia770.c
index a501a473ffd6..918e86634bc9 100644
--- a/arch/arm/mach-omap1/board-nokia770.c
+++ b/arch/arm/mach-omap1/board-nokia770.c
@@ -8,15 +8,16 @@
 #include <linux/irq.h>
 #include <linux/gpio.h>
 #include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/input.h>
 #include <linux/omapfb.h>
 
 #include <linux/spi/spi.h>
-#include <linux/spi/ads7846.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 
@@ -35,6 +36,25 @@
 #include "clock.h"
 #include "mmc.h"
 
+static const struct software_node nokia770_mpuio_gpiochip_node = {
+	.name = "mpuio",
+};
+
+static const struct software_node nokia770_gpiochip1_node = {
+	.name = "gpio-0-15",
+};
+
+static const struct software_node nokia770_gpiochip2_node = {
+	.name = "gpio-16-31",
+};
+
+static const struct software_node *nokia770_gpiochip_nodes[] = {
+	&nokia770_mpuio_gpiochip_node,
+	&nokia770_gpiochip1_node,
+	&nokia770_gpiochip2_node,
+	NULL,
+};
+
 #define ADS7846_PENDOWN_GPIO	15
 
 static const unsigned int nokia770_keymap[] = {
@@ -85,40 +105,46 @@ static struct platform_device *nokia770_devices[] __initdata = {
 	&nokia770_kp_device,
 };
 
-static void mipid_shutdown(struct mipid_platform_data *pdata)
-{
-	if (pdata->nreset_gpio != -1) {
-		printk(KERN_INFO "shutdown LCD\n");
-		gpio_set_value(pdata->nreset_gpio, 0);
-		msleep(120);
-	}
-}
-
-static struct mipid_platform_data nokia770_mipid_platform_data = {
-	.shutdown = mipid_shutdown,
-};
+static struct mipid_platform_data nokia770_mipid_platform_data = { };
 
 static const struct omap_lcd_config nokia770_lcd_config __initconst = {
 	.ctrl_name	= "hwa742",
 };
 
+static const struct property_entry nokia770_mipid_props[] = {
+	PROPERTY_ENTRY_GPIO("reset-gpios", &nokia770_gpiochip1_node,
+			    13, GPIO_ACTIVE_LOW),
+	{ }
+};
+
+static const struct software_node nokia770_mipid_swnode = {
+	.name = "lcd_mipid",
+	.properties = nokia770_mipid_props,
+};
+
 static void __init mipid_dev_init(void)
 {
-	nokia770_mipid_platform_data.nreset_gpio = 13;
 	nokia770_mipid_platform_data.data_lines = 16;
 
 	omapfb_set_lcd_config(&nokia770_lcd_config);
 }
 
-static struct ads7846_platform_data nokia770_ads7846_platform_data __initdata = {
-	.x_max		= 0x0fff,
-	.y_max		= 0x0fff,
-	.x_plate_ohms	= 180,
-	.pressure_max	= 255,
-	.debounce_max	= 10,
-	.debounce_tol	= 3,
-	.debounce_rep	= 1,
-	.gpio_pendown	= ADS7846_PENDOWN_GPIO,
+static const struct property_entry nokia770_ads7846_props[] = {
+	PROPERTY_ENTRY_U32("touchscreen-size-x", 4096),
+	PROPERTY_ENTRY_U32("touchscreen-size-y", 4096),
+	PROPERTY_ENTRY_U32("touchscreen-max-pressure", 256),
+	PROPERTY_ENTRY_U32("touchscreen-average-samples", 10),
+	PROPERTY_ENTRY_U16("ti,x-plate-ohms", 180),
+	PROPERTY_ENTRY_U16("ti,debounce-tol", 3),
+	PROPERTY_ENTRY_U16("ti,debounce-rep", 1),
+	PROPERTY_ENTRY_GPIO("pendown-gpios", &nokia770_gpiochip1_node,
+			    ADS7846_PENDOWN_GPIO, GPIO_ACTIVE_HIGH),
+	{ }
+};
+
+static const struct software_node nokia770_ads7846_swnode = {
+	.name = "ads7846",
+	.properties = nokia770_ads7846_props,
 };
 
 static struct spi_board_info nokia770_spi_board_info[] __initdata = {
@@ -128,13 +154,14 @@ static struct spi_board_info nokia770_spi_board_info[] __initdata = {
 		.chip_select    = 3,
 		.max_speed_hz   = 12000000,
 		.platform_data	= &nokia770_mipid_platform_data,
+		.swnode         = &nokia770_mipid_swnode,
 	},
 	[1] = {
 		.modalias       = "ads7846",
 		.bus_num        = 2,
 		.chip_select    = 0,
 		.max_speed_hz   = 2500000,
-		.platform_data	= &nokia770_ads7846_platform_data,
+		.swnode         = &nokia770_ads7846_swnode,
 	},
 };
 
@@ -212,14 +239,16 @@ static inline void nokia770_mmc_init(void)
 #endif
 
 #if IS_ENABLED(CONFIG_I2C_CBUS_GPIO)
-static struct gpiod_lookup_table nokia770_cbus_gpio_table = {
-	.dev_id = "i2c-cbus-gpio.2",
-	.table = {
-		GPIO_LOOKUP_IDX("mpuio", 9, NULL, 0, 0), /* clk */
-		GPIO_LOOKUP_IDX("mpuio", 10, NULL, 1, 0), /* dat */
-		GPIO_LOOKUP_IDX("mpuio", 11, NULL, 2, 0), /* sel */
-		{ },
-	},
+
+static const struct software_node_ref_args nokia770_cbus_gpio_refs[] = {
+	SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_swnode, 9, 0),
+	SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_swnode, 10, 0),
+	SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_swnode, 11, 0),
+};
+
+static const struct property_entry nokia770_ads7846_props[] = {
+	PROPERTY_ENTRY_REF_ARRAY("gpios", nokia770_cbus_gpio_refs),
+	{ }
 };
 
 static struct platform_device nokia770_cbus_device = {
@@ -253,7 +282,8 @@ static void __init nokia770_cbus_init(void)
 	nokia770_i2c_board_info_2[1].irq = gpio_to_irq(tahvo_irq_gpio);
 	i2c_register_board_info(2, nokia770_i2c_board_info_2,
 				ARRAY_SIZE(nokia770_i2c_board_info_2));
-	gpiod_add_lookup_table(&nokia770_cbus_gpio_table);
+	device_create_managed_software_node(&nokia770_cbus_device.dev,
+					    nokia770_cbus_props, NULL);
 	platform_device_register(&nokia770_cbus_device);
 }
 #else /* CONFIG_I2C_CBUS_GPIO */
@@ -273,8 +303,8 @@ static void __init omap_nokia770_init(void)
 	/* Unmask SleepX signal */
 	omap_writew((omap_readw(0xfffb5004) & ~2), 0xfffb5004);
 
+	software_node_register_node_group(nokia770_gpiochip_nodes);
 	platform_add_devices(nokia770_devices, ARRAY_SIZE(nokia770_devices));
-	nokia770_spi_board_info[1].irq = gpio_to_irq(15);
 	spi_register_board_info(nokia770_spi_board_info,
 				ARRAY_SIZE(nokia770_spi_board_info));
 	omap_serial_init();
diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index 4325bdc2b9ff..c473304b4e3d 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -506,10 +506,18 @@ static struct ads7846_platform_data spitz_ads7846_info = {
 	.x_plate_ohms		= 419,
 	.y_plate_ohms		= 486,
 	.pressure_max		= 1024,
-	.gpio_pendown		= SPITZ_GPIO_TP_INT,
 	.wait_for_sync		= spitz_ads7846_wait_for_hsync,
 };
 
+static struct gpiod_lookup_table spitz_ads7846_gpio_table = {
+	.dev_id = "spi2.0",
+	.table = {
+		GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT,
+			    "pendown", GPIO_ACTIVE_HIGH),
+		{ },
+	},
+};
+
 static void spitz_bl_kick_battery(void)
 {
 	void (*kick_batt)(void);
@@ -594,6 +602,7 @@ static void __init spitz_spi_init(void)
 	else
 		gpiod_add_lookup_table(&spitz_lcdcon_gpio_table);
 
+	gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
 	gpiod_add_lookup_table(&spitz_spi_gpio_table);
 	pxa2xx_set_spi_info(2, &spitz_spi_info);
 	spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices));
diff --git a/arch/mips/alchemy/devboards/db1000.c b/arch/mips/alchemy/devboards/db1000.c
index 2c52ee27b4f2..f37644859f89 100644
--- a/arch/mips/alchemy/devboards/db1000.c
+++ b/arch/mips/alchemy/devboards/db1000.c
@@ -381,13 +381,21 @@ static struct platform_device db1100_mmc1_dev = {
 static struct ads7846_platform_data db1100_touch_pd = {
 	.model		= 7846,
 	.vref_mv	= 3300,
-	.gpio_pendown	= 21,
 };
 
 static struct spi_gpio_platform_data db1100_spictl_pd = {
 	.num_chipselect = 1,
 };
 
+static struct gpiod_lookup_table db1100_touch_gpio_table = {
+	.dev_id = "spi0.0",
+	.table = {
+		GPIO_LOOKUP("alchemy-gpio2", 21,
+			    "pendown", GPIO_ACTIVE_HIGH),
+		{ },
+	},
+};
+
 static struct spi_board_info db1100_spi_info[] __initdata = {
 	[0] = {
 		.modalias	 = "ads7846",
@@ -474,6 +482,7 @@ int __init db1000_dev_setup(void)
 		pfc |= (1 << 0);	/* SSI0 pins as GPIOs */
 		alchemy_wrsys(pfc, AU1000_SYS_PINFUNC);
 
+		gpiod_add_lookup_table(&db1100_touch_gpio_table);
 		spi_register_board_info(db1100_spi_info,
 					ARRAY_SIZE(db1100_spi_info));
 
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index bb1058b1e7fd..91536b0b9393 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -24,11 +24,8 @@
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/pm.h>
-#include <linux/of.h>
-#include <linux/of_gpio.h>
-#include <linux/of_device.h>
+#include <linux/property.h>
 #include <linux/gpio/consumer.h>
-#include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/ads7846.h>
 #include <linux/regulator/consumer.h>
@@ -140,7 +137,7 @@ struct ads7846 {
 	int			(*filter)(void *data, int data_idx, int *val);
 	void			*filter_data;
 	int			(*get_pendown_state)(void);
-	int			gpio_pendown;
+	struct gpio_desc	*gpio_pendown;
 
 	void			(*wait_for_sync)(void);
 };
@@ -223,7 +220,7 @@ static int get_pendown_state(struct ads7846 *ts)
 	if (ts->get_pendown_state)
 		return ts->get_pendown_state();
 
-	return !gpio_get_value(ts->gpio_pendown);
+	return !gpiod_get_value(ts->gpio_pendown);
 }
 
 static void ads7846_report_pen_up(struct ads7846 *ts)
@@ -989,8 +986,6 @@ static int ads7846_setup_pendown(struct spi_device *spi,
 				 struct ads7846 *ts,
 				 const struct ads7846_platform_data *pdata)
 {
-	int err;
-
 	/*
 	 * REVISIT when the irq can be triggered active-low, or if for some
 	 * reason the touchscreen isn't hooked up, we don't need to access
@@ -999,25 +994,15 @@ static int ads7846_setup_pendown(struct spi_device *spi,
 
 	if (pdata->get_pendown_state) {
 		ts->get_pendown_state = pdata->get_pendown_state;
-	} else if (gpio_is_valid(pdata->gpio_pendown)) {
-
-		err = devm_gpio_request_one(&spi->dev, pdata->gpio_pendown,
-					    GPIOF_IN, "ads7846_pendown");
-		if (err) {
-			dev_err(&spi->dev,
-				"failed to request/setup pendown GPIO%d: %d\n",
-				pdata->gpio_pendown, err);
-			return err;
+	} else {
+		ts->gpio_pendown = gpiod_get(&spi->dev, "pendown", GPIOD_IN);
+		if (IS_ERR(ts->gpio_pendown)) {
+			dev_err(&spi->dev, "failed to request pendown GPIO\n");
+			return PTR_ERR(ts->gpio_pendown);
 		}
-
-		ts->gpio_pendown = pdata->gpio_pendown;
-
 		if (pdata->gpio_pendown_debounce)
-			gpiod_set_debounce(gpio_to_desc(ts->gpio_pendown),
+			gpiod_set_debounce(ts->gpio_pendown,
 					   pdata->gpio_pendown_debounce);
-	} else {
-		dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
-		return -EINVAL;
 	}
 
 	return 0;
@@ -1119,7 +1104,6 @@ static int ads7846_setup_spi_msg(struct ads7846 *ts,
 	return 0;
 }
 
-#ifdef CONFIG_OF
 static const struct of_device_id ads7846_dt_ids[] = {
 	{ .compatible = "ti,tsc2046",	.data = (void *) 7846 },
 	{ .compatible = "ti,ads7843",	.data = (void *) 7843 },
@@ -1130,20 +1114,14 @@ static const struct of_device_id ads7846_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, ads7846_dt_ids);
 
-static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
+static const struct ads7846_platform_data *ads7846_get_props(struct device *dev)
 {
 	struct ads7846_platform_data *pdata;
-	struct device_node *node = dev->of_node;
-	const struct of_device_id *match;
+	const struct platform_device_id *pdev_id;
 	u32 value;
 
-	if (!node) {
-		dev_err(dev, "Device does not have associated DT data\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	match = of_match_device(ads7846_dt_ids, dev);
-	if (!match) {
+	pdev_id = device_get_match_data(dev);
+	if (!pdev_id) {
 		dev_err(dev, "Unknown device model\n");
 		return ERR_PTR(-EINVAL);
 	}
@@ -1152,60 +1130,51 @@ static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
-	pdata->model = (unsigned long)match->data;
+	pdata->model = (unsigned long)pdev_id->driver_data;
 
-	of_property_read_u16(node, "ti,vref-delay-usecs",
-			     &pdata->vref_delay_usecs);
-	of_property_read_u16(node, "ti,vref-mv", &pdata->vref_mv);
-	pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on");
+	device_property_read_u16(dev, "ti,vref-delay-usecs",
+				 &pdata->vref_delay_usecs);
+	device_property_read_u16(dev, "ti,vref-mv", &pdata->vref_mv);
+	pdata->keep_vref_on = device_property_read_bool(dev, "ti,keep-vref-on");
 
-	pdata->swap_xy = of_property_read_bool(node, "ti,swap-xy");
+	pdata->swap_xy = device_property_read_bool(dev, "ti,swap-xy");
 
-	of_property_read_u16(node, "ti,settle-delay-usec",
-			     &pdata->settle_delay_usecs);
-	of_property_read_u16(node, "ti,penirq-recheck-delay-usecs",
-			     &pdata->penirq_recheck_delay_usecs);
+	device_property_read_u16(dev, "ti,settle-delay-usec",
+				 &pdata->settle_delay_usecs);
+	device_property_read_u16(dev, "ti,penirq-recheck-delay-usecs",
+				 &pdata->penirq_recheck_delay_usecs);
 
-	of_property_read_u16(node, "ti,x-plate-ohms", &pdata->x_plate_ohms);
-	of_property_read_u16(node, "ti,y-plate-ohms", &pdata->y_plate_ohms);
+	device_property_read_u16(dev, "ti,x-plate-ohms", &pdata->x_plate_ohms);
+	device_property_read_u16(dev, "ti,y-plate-ohms", &pdata->y_plate_ohms);
 
-	of_property_read_u16(node, "ti,x-min", &pdata->x_min);
-	of_property_read_u16(node, "ti,y-min", &pdata->y_min);
-	of_property_read_u16(node, "ti,x-max", &pdata->x_max);
-	of_property_read_u16(node, "ti,y-max", &pdata->y_max);
+	device_property_read_u16(dev, "ti,x-min", &pdata->x_min);
+	device_property_read_u16(dev, "ti,y-min", &pdata->y_min);
+	device_property_read_u16(dev, "ti,x-max", &pdata->x_max);
+	device_property_read_u16(dev, "ti,y-max", &pdata->y_max);
 
 	/*
 	 * touchscreen-max-pressure gets parsed during
 	 * touchscreen_parse_properties()
 	 */
-	of_property_read_u16(node, "ti,pressure-min", &pdata->pressure_min);
-	if (!of_property_read_u32(node, "touchscreen-min-pressure", &value))
+	device_property_read_u16(dev, "ti,pressure-min", &pdata->pressure_min);
+	if (!device_property_read_u32(dev, "touchscreen-min-pressure", &value))
 		pdata->pressure_min = (u16) value;
-	of_property_read_u16(node, "ti,pressure-max", &pdata->pressure_max);
+	device_property_read_u16(dev, "ti,pressure-max", &pdata->pressure_max);
 
-	of_property_read_u16(node, "ti,debounce-max", &pdata->debounce_max);
-	if (!of_property_read_u32(node, "touchscreen-average-samples", &value))
+	device_property_read_u16(dev, "ti,debounce-max", &pdata->debounce_max);
+	if (!device_property_read_u32(dev, "touchscreen-average-samples", &value))
 		pdata->debounce_max = (u16) value;
-	of_property_read_u16(node, "ti,debounce-tol", &pdata->debounce_tol);
-	of_property_read_u16(node, "ti,debounce-rep", &pdata->debounce_rep);
+	device_property_read_u16(dev, "ti,debounce-tol", &pdata->debounce_tol);
+	device_property_read_u16(dev, "ti,debounce-rep", &pdata->debounce_rep);
 
-	of_property_read_u32(node, "ti,pendown-gpio-debounce",
+	device_property_read_u32(dev, "ti,pendown-gpio-debounce",
 			     &pdata->gpio_pendown_debounce);
 
-	pdata->wakeup = of_property_read_bool(node, "wakeup-source") ||
-			of_property_read_bool(node, "linux,wakeup");
-
-	pdata->gpio_pendown = of_get_named_gpio(dev->of_node, "pendown-gpio", 0);
+	pdata->wakeup = device_property_read_bool(dev, "wakeup-source") ||
+			device_property_read_bool(dev, "linux,wakeup");
 
 	return pdata;
 }
-#else
-static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
-{
-	dev_err(dev, "no platform data defined\n");
-	return ERR_PTR(-EINVAL);
-}
-#endif
 
 static void ads7846_regulator_disable(void *regulator)
 {
@@ -1269,7 +1238,7 @@ static int ads7846_probe(struct spi_device *spi)
 
 	pdata = dev_get_platdata(dev);
 	if (!pdata) {
-		pdata = ads7846_probe_dt(dev);
+		pdata = ads7846_get_props(dev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}
@@ -1426,7 +1395,7 @@ static struct spi_driver ads7846_driver = {
 	.driver = {
 		.name	= "ads7846",
 		.pm	= pm_sleep_ptr(&ads7846_pm),
-		.of_match_table = of_match_ptr(ads7846_dt_ids),
+		.of_match_table = ads7846_dt_ids,
 	},
 	.probe		= ads7846_probe,
 	.remove		= ads7846_remove,
diff --git a/drivers/video/fbdev/omap/lcd_mipid.c b/drivers/video/fbdev/omap/lcd_mipid.c
index 03cff39d392d..e4a7f0b824ff 100644
--- a/drivers/video/fbdev/omap/lcd_mipid.c
+++ b/drivers/video/fbdev/omap/lcd_mipid.c
@@ -7,6 +7,7 @@
  */
 #include <linux/device.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/spi/spi.h>
@@ -41,6 +42,7 @@ struct mipid_device {
 						   when we can issue the
 						   next sleep in/out command */
 	unsigned long	hw_guard_wait;		/* max guard time in jiffies */
+	struct gpio_desc	*reset;
 
 	struct omapfb_device	*fbdev;
 	struct spi_device	*spi;
@@ -556,6 +558,12 @@ static int mipid_spi_probe(struct spi_device *spi)
 		return -ENOMEM;
 	}
 
+	/* This will de-assert RESET if active */
+	md->reset = gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(md->reset))
+		return dev_err_probe(&spi->dev, PTR_ERR(md->reset),
+				     "no reset GPIO line\n");
+
 	spi->mode = SPI_MODE_0;
 	md->spi = spi;
 	dev_set_drvdata(&spi->dev, md);
@@ -574,6 +582,8 @@ static void mipid_spi_remove(struct spi_device *spi)
 {
 	struct mipid_device *md = dev_get_drvdata(&spi->dev);
 
+	/* Asserts RESET */
+	gpiod_set_value(md->reset, 1);
 	mipid_disable(&md->panel);
 	kfree(md);
 }
diff --git a/include/linux/platform_data/lcd-mipid.h b/include/linux/platform_data/lcd-mipid.h
index 63f05eb23827..4927cfc5158c 100644
--- a/include/linux/platform_data/lcd-mipid.h
+++ b/include/linux/platform_data/lcd-mipid.h
@@ -15,10 +15,8 @@ enum mipid_test_result {
 #ifdef __KERNEL__
 
 struct mipid_platform_data {
-	int	nreset_gpio;
 	int	data_lines;
 
-	void	(*shutdown)(struct mipid_platform_data *pdata);
 	void	(*set_bklight_level)(struct mipid_platform_data *pdata,
 				     int level);
 	int	(*get_bklight_level)(struct mipid_platform_data *pdata);
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index d424c1aadf38..a04c1c34c344 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -35,8 +35,6 @@ struct ads7846_platform_data {
 	u16	debounce_tol;		/* tolerance used for filtering */
 	u16	debounce_rep;		/* additional consecutive good readings
 					 * required after the first two */
-	int	gpio_pendown;		/* the GPIO used to decide the pendown
-					 * state if get_pendown_state == NULL */
 	int	gpio_pendown_debounce;	/* platform specific debounce time for
 					 * the gpio_pendown */
 	int	(*get_pendown_state)(void);

-- 
2.34.1

[PATCH v3 2/3] ARM/mmc: Convert old mmci-omap to GPIO descriptors

[Linus Walleij]

A recent change to the OMAP driver making it use a dynamic GPIO
base created problems with some old OMAP1 board files, among
them Nokia 770, SX1 and also the OMAP2 Nokia n8x0.

Fix up all instances of GPIOs being used for the MMC driver
by pushing the handling of power, slot selection and MMC
"cover" into the driver as optional GPIOs.

This is maybe not the most perfect solution as the MMC
framework have some central handlers for some of the
stuff, but it at least makes the situtation better and
solves the immediate issue.

Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/mach-omap1/board-nokia770.c   | 43 ++++++-----------
 arch/arm/mach-omap1/board-sx1-mmc.c    |  1 -
 arch/arm/mach-omap2/board-n8x0.c       | 85 +++++++++++-----------------------
 drivers/mmc/host/omap.c                | 46 +++++++++++++++++-
 include/linux/platform_data/mmc-omap.h |  2 -
 5 files changed, 83 insertions(+), 94 deletions(-)

diff --git a/arch/arm/mach-omap1/board-nokia770.c b/arch/arm/mach-omap1/board-nokia770.c
index 918e86634bc9..dc37ea30bbcf 100644
--- a/arch/arm/mach-omap1/board-nokia770.c
+++ b/arch/arm/mach-omap1/board-nokia770.c
@@ -183,27 +183,23 @@ static struct omap_usb_config nokia770_usb_config __initdata = {
 
 #if IS_ENABLED(CONFIG_MMC_OMAP)
 
-#define NOKIA770_GPIO_MMC_POWER		41
-#define NOKIA770_GPIO_MMC_SWITCH	23
-
-static int nokia770_mmc_set_power(struct device *dev, int slot, int power_on,
-				int vdd)
-{
-	gpio_set_value(NOKIA770_GPIO_MMC_POWER, power_on);
-	return 0;
-}
-
-static int nokia770_mmc_get_cover_state(struct device *dev, int slot)
-{
-	return gpio_get_value(NOKIA770_GPIO_MMC_SWITCH);
-}
+static struct gpiod_lookup_table nokia770_mmc_gpio_table = {
+	.dev_id = "mmci-omap",
+	.table = {
+		/* Slot index 0, VSD power, GPIO 41 */
+		GPIO_LOOKUP_IDX("gpio-32-47", 9,
+				"vsd", 0, GPIO_ACTIVE_HIGH),
+		/* Slot index 0, switch, GPIO 23 */
+		GPIO_LOOKUP_IDX("gpio-16-31", 7,
+				"cover", 0, GPIO_ACTIVE_HIGH),
+		{ }
+	},
+};
 
 static struct omap_mmc_platform_data nokia770_mmc2_data = {
 	.nr_slots                       = 1,
 	.max_freq                       = 12000000,
 	.slots[0]       = {
-		.set_power		= nokia770_mmc_set_power,
-		.get_cover_state	= nokia770_mmc_get_cover_state,
 		.ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
 		.name                   = "mmcblk",
 	},
@@ -213,20 +209,7 @@ static struct omap_mmc_platform_data *nokia770_mmc_data[OMAP16XX_NR_MMC];
 
 static void __init nokia770_mmc_init(void)
 {
-	int ret;
-
-	ret = gpio_request(NOKIA770_GPIO_MMC_POWER, "MMC power");
-	if (ret < 0)
-		return;
-	gpio_direction_output(NOKIA770_GPIO_MMC_POWER, 0);
-
-	ret = gpio_request(NOKIA770_GPIO_MMC_SWITCH, "MMC cover");
-	if (ret < 0) {
-		gpio_free(NOKIA770_GPIO_MMC_POWER);
-		return;
-	}
-	gpio_direction_input(NOKIA770_GPIO_MMC_SWITCH);
-
+	gpiod_add_lookup_table(&nokia770_mmc_gpio_table);
 	/* Only the second MMC controller is used */
 	nokia770_mmc_data[1] = &nokia770_mmc2_data;
 	omap1_init_mmc(nokia770_mmc_data, OMAP16XX_NR_MMC);
diff --git a/arch/arm/mach-omap1/board-sx1-mmc.c b/arch/arm/mach-omap1/board-sx1-mmc.c
index f1c160924dfe..f183a8448a7b 100644
--- a/arch/arm/mach-omap1/board-sx1-mmc.c
+++ b/arch/arm/mach-omap1/board-sx1-mmc.c
@@ -9,7 +9,6 @@
  * Copyright (C) 2007 Instituto Nokia de Tecnologia - INdT
  */
 
-#include <linux/gpio.h>
 #include <linux/platform_device.h>
 
 #include "hardware.h"
diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index 3353b0a923d9..baa2f0341aed 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -11,6 +11,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -170,22 +171,32 @@ static struct spi_board_info n800_spi_board_info[] __initdata = {
  * GPIO23 and GPIO9		slot 2 EMMC on N810
  *
  */
-#define N8X0_SLOT_SWITCH_GPIO	96
-#define N810_EMMC_VSD_GPIO	23
-#define N810_EMMC_VIO_GPIO	9
-
 static int slot1_cover_open;
 static int slot2_cover_open;
 static struct device *mmc_device;
 
-static int n8x0_mmc_switch_slot(struct device *dev, int slot)
-{
-#ifdef CONFIG_MMC_DEBUG
-	dev_dbg(dev, "Choose slot %d\n", slot + 1);
-#endif
-	gpio_set_value(N8X0_SLOT_SWITCH_GPIO, slot);
-	return 0;
-}
+static struct gpiod_lookup_table nokia8xx_mmc_gpio_table = {
+	.dev_id = "mmci-omap",
+	.table = {
+		/* Slot switch, GPIO 96 */
+		GPIO_LOOKUP("gpio-80-111", 16,
+			    "switch", GPIO_ACTIVE_HIGH),
+		{ }
+	},
+};
+
+static struct gpiod_lookup_table nokia810_mmc_gpio_table = {
+	.dev_id = "mmci-omap",
+	.table = {
+		/* Slot index 1, VSD power, GPIO 23 */
+		GPIO_LOOKUP_IDX("gpio-16-31", 7,
+				"vsd", 1, GPIO_ACTIVE_HIGH),
+		/* Slot index 1, VIO power, GPIO 9 */
+		GPIO_LOOKUP_IDX("gpio-0-15", 9,
+				"vsd", 1, GPIO_ACTIVE_HIGH),
+		{ }
+	},
+};
 
 static int n8x0_mmc_set_power_menelaus(struct device *dev, int slot,
 					int power_on, int vdd)
@@ -256,31 +267,13 @@ static int n8x0_mmc_set_power_menelaus(struct device *dev, int slot,
 	return 0;
 }
 
-static void n810_set_power_emmc(struct device *dev,
-					 int power_on)
-{
-	dev_dbg(dev, "Set EMMC power %s\n", power_on ? "on" : "off");
-
-	if (power_on) {
-		gpio_set_value(N810_EMMC_VSD_GPIO, 1);
-		msleep(1);
-		gpio_set_value(N810_EMMC_VIO_GPIO, 1);
-		msleep(1);
-	} else {
-		gpio_set_value(N810_EMMC_VIO_GPIO, 0);
-		msleep(50);
-		gpio_set_value(N810_EMMC_VSD_GPIO, 0);
-		msleep(50);
-	}
-}
-
 static int n8x0_mmc_set_power(struct device *dev, int slot, int power_on,
 			      int vdd)
 {
 	if (board_is_n800() || slot == 0)
 		return n8x0_mmc_set_power_menelaus(dev, slot, power_on, vdd);
 
-	n810_set_power_emmc(dev, power_on);
+	/* The n810 power will be handled by GPIO code in the driver */
 
 	return 0;
 }
@@ -418,13 +411,6 @@ static void n8x0_mmc_shutdown(struct device *dev)
 static void n8x0_mmc_cleanup(struct device *dev)
 {
 	menelaus_unregister_mmc_callback();
-
-	gpio_free(N8X0_SLOT_SWITCH_GPIO);
-
-	if (board_is_n810()) {
-		gpio_free(N810_EMMC_VSD_GPIO);
-		gpio_free(N810_EMMC_VIO_GPIO);
-	}
 }
 
 /*
@@ -433,7 +419,6 @@ static void n8x0_mmc_cleanup(struct device *dev)
  */
 static struct omap_mmc_platform_data mmc1_data = {
 	.nr_slots			= 0,
-	.switch_slot			= n8x0_mmc_switch_slot,
 	.init				= n8x0_mmc_late_init,
 	.cleanup			= n8x0_mmc_cleanup,
 	.shutdown			= n8x0_mmc_shutdown,
@@ -463,14 +448,9 @@ static struct omap_mmc_platform_data mmc1_data = {
 
 static struct omap_mmc_platform_data *mmc_data[OMAP24XX_NR_MMC];
 
-static struct gpio n810_emmc_gpios[] __initdata = {
-	{ N810_EMMC_VSD_GPIO, GPIOF_OUT_INIT_LOW,  "MMC slot 2 Vddf" },
-	{ N810_EMMC_VIO_GPIO, GPIOF_OUT_INIT_LOW,  "MMC slot 2 Vdd"  },
-};
-
 static void __init n8x0_mmc_init(void)
 {
-	int err;
+	gpiod_add_lookup_table(&nokia8xx_mmc_gpio_table);
 
 	if (board_is_n810()) {
 		mmc1_data.slots[0].name = "external";
@@ -483,20 +463,7 @@ static void __init n8x0_mmc_init(void)
 		 */
 		mmc1_data.slots[1].name = "internal";
 		mmc1_data.slots[1].ban_openended = 1;
-	}
-
-	err = gpio_request_one(N8X0_SLOT_SWITCH_GPIO, GPIOF_OUT_INIT_LOW,
-			       "MMC slot switch");
-	if (err)
-		return;
-
-	if (board_is_n810()) {
-		err = gpio_request_array(n810_emmc_gpios,
-					 ARRAY_SIZE(n810_emmc_gpios));
-		if (err) {
-			gpio_free(N8X0_SLOT_SWITCH_GPIO);
-			return;
-		}
+		gpiod_add_lookup_table(&nokia810_mmc_gpio_table);
 	}
 
 	mmc1_data.nr_slots = 2;
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index ce78edfb402b..a14af21f12da 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -26,6 +26,7 @@
 #include <linux/clk.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/gpio/consumer.h>
 #include <linux/platform_data/mmc-omap.h>
 
 
@@ -111,6 +112,9 @@ struct mmc_omap_slot {
 	struct mmc_request      *mrq;
 	struct mmc_omap_host    *host;
 	struct mmc_host		*mmc;
+	struct gpio_desc	*vsd;
+	struct gpio_desc	*vio;
+	struct gpio_desc	*cover;
 	struct omap_mmc_slot_data *pdata;
 };
 
@@ -133,6 +137,7 @@ struct mmc_omap_host {
 	int			irq;
 	unsigned char		bus_mode;
 	unsigned int		reg_shift;
+	struct gpio_desc	*slot_switch;
 
 	struct work_struct	cmd_abort_work;
 	unsigned		abort:1;
@@ -216,8 +221,13 @@ static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
 
 	if (host->current_slot != slot) {
 		OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
-		if (host->pdata->switch_slot != NULL)
-			host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
+		if (host->slot_switch)
+			/*
+			 * With two slots and a simple GPIO switch, setting
+			 * the GPIO to 0 selects slot ID 0, setting it to 1
+			 * selects slot ID 1.
+			 */
+			gpiod_set_value(host->slot_switch, slot->id);
 		host->current_slot = slot;
 	}
 
@@ -297,6 +307,9 @@ static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
 static inline
 int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
 {
+	/* If we have a GPIO then use that */
+	if (slot->cover)
+		return gpiod_get_value(slot->cover);
 	if (slot->pdata->get_cover_state)
 		return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
 						    slot->id);
@@ -1106,6 +1119,11 @@ static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
 
 	host = slot->host;
 
+	if (slot->vsd)
+		gpiod_set_value(slot->vsd, power_on);
+	if (slot->vio)
+		gpiod_set_value(slot->vio, power_on);
+
 	if (slot->pdata->set_power != NULL)
 		slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
 					vdd);
@@ -1240,6 +1258,23 @@ static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
 	slot->power_mode = MMC_POWER_UNDEFINED;
 	slot->pdata = &host->pdata->slots[id];
 
+	/* Check for some optional GPIO controls */
+	slot->vsd = gpiod_get_index_optional(host->dev, "vsd",
+					     id, GPIOD_OUT_LOW);
+	if (IS_ERR(slot->vsd))
+		return dev_err_probe(host->dev, PTR_ERR(slot->vsd),
+				     "error looking up VSD GPIO\n");
+	slot->vio = gpiod_get_index_optional(host->dev, "vio",
+					     id, GPIOD_OUT_LOW);
+	if (IS_ERR(slot->vio))
+		return dev_err_probe(host->dev, PTR_ERR(slot->vio),
+				     "error looking up VIO GPIO\n");
+	slot->cover = gpiod_get_index_optional(host->dev, "cover",
+						id, GPIOD_IN);
+	if (IS_ERR(slot->cover))
+		return dev_err_probe(host->dev, PTR_ERR(slot->cover),
+				     "error looking up cover switch GPIO\n");
+
 	host->slots[id] = slot;
 
 	mmc->caps = 0;
@@ -1349,6 +1384,13 @@ static int mmc_omap_probe(struct platform_device *pdev)
 	if (IS_ERR(host->virt_base))
 		return PTR_ERR(host->virt_base);
 
+	host->slot_switch = gpiod_get_optional(host->dev, "switch",
+					       GPIOD_OUT_LOW);
+	if (IS_ERR(host->slot_switch))
+		return dev_err_probe(host->dev, PTR_ERR(host->slot_switch),
+				     "error looking up slot switch GPIO\n");
+
+
 	INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
 	INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
 
diff --git a/include/linux/platform_data/mmc-omap.h b/include/linux/platform_data/mmc-omap.h
index 91051e9907f3..054d0c3c5ec5 100644
--- a/include/linux/platform_data/mmc-omap.h
+++ b/include/linux/platform_data/mmc-omap.h
@@ -20,8 +20,6 @@ struct omap_mmc_platform_data {
 	 * maximum frequency on the MMC bus */
 	unsigned int max_freq;
 
-	/* switch the bus to a new slot */
-	int (*switch_slot)(struct device *dev, int slot);
 	/* initialize board-specific MMC functionality, can be NULL if
 	 * not supported */
 	int (*init)(struct device *dev);

-- 
2.34.1

[PATCH v3 3/3] ARM: omap1: Fix up the Nokia 770 board device IRQs

[Linus Walleij]

The platform devices on the Nokia 770 is using some
board-specific IRQs that get statically assigned to platform
devices in the boardfile.

This does not work with dynamic IRQ chip bases.

Utilize the NULL device to define some board-specific
GPIO lookups and use these to immediately look up the
same GPIOs, convert to IRQ numbers and pass as resources
to the devices. This is ugly but should work.

Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/mach-omap1/board-nokia770.c | 57 ++++++++++++++++++++++++++++--------
 1 file changed, 44 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-omap1/board-nokia770.c b/arch/arm/mach-omap1/board-nokia770.c
index dc37ea30bbcf..27bd5522e1de 100644
--- a/arch/arm/mach-omap1/board-nokia770.c
+++ b/arch/arm/mach-omap1/board-nokia770.c
@@ -6,7 +6,7 @@
  */
 #include <linux/clkdev.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/gpio/machine.h>
 #include <linux/gpio/property.h>
 #include <linux/kernel.h>
@@ -250,19 +250,25 @@ static struct i2c_board_info nokia770_i2c_board_info_2[] __initdata = {
 
 static void __init nokia770_cbus_init(void)
 {
-	const int retu_irq_gpio = 62;
-	const int tahvo_irq_gpio = 40;
-
-	if (gpio_request_one(retu_irq_gpio, GPIOF_IN, "Retu IRQ"))
-		return;
-	if (gpio_request_one(tahvo_irq_gpio, GPIOF_IN, "Tahvo IRQ")) {
-		gpio_free(retu_irq_gpio);
-		return;
+	struct gpio_desc *d;
+	int irq;
+
+	d = gpiod_get(NULL, "retu_irq", GPIOD_IN);
+	if (IS_ERR(d)) {
+		pr_err("Unable to get CBUS Retu IRQ GPIO descriptor\n");
+	} else {
+		irq = gpiod_to_irq(d);
+		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
+		nokia770_i2c_board_info_2[0].irq = irq;
+	}
+	d = gpiod_get(NULL, "tahvo_irq", GPIOD_IN);
+	if (IS_ERR(d)) {
+		pr_err("Unable to get CBUS Tahvo IRQ GPIO descriptor\n");
+	} else {
+		irq = gpiod_to_irq(d);
+		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
+		nokia770_i2c_board_info_2[1].irq = irq;
 	}
-	irq_set_irq_type(gpio_to_irq(retu_irq_gpio), IRQ_TYPE_EDGE_RISING);
-	irq_set_irq_type(gpio_to_irq(tahvo_irq_gpio), IRQ_TYPE_EDGE_RISING);
-	nokia770_i2c_board_info_2[0].irq = gpio_to_irq(retu_irq_gpio);
-	nokia770_i2c_board_info_2[1].irq = gpio_to_irq(tahvo_irq_gpio);
 	i2c_register_board_info(2, nokia770_i2c_board_info_2,
 				ARRAY_SIZE(nokia770_i2c_board_info_2));
 	device_create_managed_software_node(&nokia770_cbus_device.dev,
@@ -275,8 +281,25 @@ static void __init nokia770_cbus_init(void)
 }
 #endif /* CONFIG_I2C_CBUS_GPIO */
 
+static struct gpiod_lookup_table nokia770_irq_gpio_table = {
+	.dev_id = NULL,
+	.table = {
+		/* GPIO used by SPI device 1 */
+		GPIO_LOOKUP("gpio-0-15", 15, "ads7846_irq",
+			    GPIO_ACTIVE_HIGH),
+		/* GPIO used for retu IRQ */
+		GPIO_LOOKUP("gpio-48-63", 15, "retu_irq",
+			    GPIO_ACTIVE_HIGH),
+		/* GPIO used for tahvo IRQ */
+		GPIO_LOOKUP("gpio-32-47", 8, "tahvo_irq",
+			    GPIO_ACTIVE_HIGH),
+	},
+};
+
 static void __init omap_nokia770_init(void)
 {
+	struct gpio_desc *d;
+
 	/* On Nokia 770, the SleepX signal is masked with an
 	 * MPUIO line by default.  It has to be unmasked for it
 	 * to become functional */
@@ -288,6 +311,14 @@ static void __init omap_nokia770_init(void)
 
 	software_node_register_node_group(nokia770_gpiochip_nodes);
 	platform_add_devices(nokia770_devices, ARRAY_SIZE(nokia770_devices));
+
+	gpiod_add_lookup_table(&nokia770_irq_gpio_table);
+	d = gpiod_get(NULL, "ads7846_irq", GPIOD_IN);
+	if (IS_ERR(d))
+		pr_err("Unable to get ADS7846 IRQ GPIO descriptor\n");
+	else
+		nokia770_spi_board_info[1].irq = gpiod_to_irq(d);
+
 	spi_register_board_info(nokia770_spi_board_info,
 				ARRAY_SIZE(nokia770_spi_board_info));
 	omap_serial_init();

-- 
2.34.1

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Dmitry Torokhov]

Hi Linus,
On Fri, May 05, 2023 at 01:16:55PM +0200, Linus Walleij wrote:
> 
> Populate the devices on the Nokia 770 CBUS I2C using software
> nodes instead of platform data quirks. This includes the LCD
> and the ADS7846 touchscreen so the conversion just brings the LCD
> along with it as software nodes is an all-or-nothing design
> pattern.

Wow, so that worked , awesome!

> +static const struct property_entry nokia770_ads7846_props[] = {
> +	PROPERTY_ENTRY_U32("touchscreen-size-x", 4096),
> +	PROPERTY_ENTRY_U32("touchscreen-size-y", 4096),
> +	PROPERTY_ENTRY_U32("touchscreen-max-pressure", 256),
> +	PROPERTY_ENTRY_U32("touchscreen-average-samples", 10),
> +	PROPERTY_ENTRY_U16("ti,x-plate-ohms", 180),
> +	PROPERTY_ENTRY_U16("ti,debounce-tol", 3),
> +	PROPERTY_ENTRY_U16("ti,debounce-rep", 1),
> +	PROPERTY_ENTRY_GPIO("pendown-gpios", &nokia770_gpiochip1_node,
> +			    ADS7846_PENDOWN_GPIO, GPIO_ACTIVE_HIGH),

Looking at the driver this actually needs to be GPIO_ACTIVE_LOW.

>  
> +static struct gpiod_lookup_table spitz_ads7846_gpio_table = {
> +	.dev_id = "spi2.0",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT,
> +			    "pendown", GPIO_ACTIVE_HIGH),

GPIO_ACTIVE_LOW here too.

> +static struct gpiod_lookup_table db1100_touch_gpio_table = {
> +	.dev_id = "spi0.0",
> +	.table = {
> +		GPIO_LOOKUP("alchemy-gpio2", 21,
> +			    "pendown", GPIO_ACTIVE_HIGH),

And here as well.

> @@ -223,7 +220,7 @@ static int get_pendown_state(struct ads7846 *ts)
>  	if (ts->get_pendown_state)
>  		return ts->get_pendown_state();
>  
> -	return !gpio_get_value(ts->gpio_pendown);
> +	return !gpiod_get_value(ts->gpio_pendown);

This needs to be

	return !gpiod_get_value_raw(ts->gpio_pendown);

I looked at various DTSes we have and they use a mix of active high and
active low annotations, so we have to go with the "raw" variant for now,
and then update to normal one once we update bad DTSes.

Thanks!

-- 
Dmitry

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[andy.shevchenko]

Fri, May 05, 2023 at 01:16:55PM +0200, Linus Walleij kirjoitti:
> The Nokia 770 is using GPIOs from the global numberspace on the
> CBUS node to pass down to the LCD controller. This regresses when we
> let the OMAP GPIO driver use dynamic GPIO base.
> 
> The Nokia 770 now has dynamic allocation of IRQ numbers, so this
> needs to be fixed for it to work.
> 
> As this is the only user of LCD MIPID we can easily augment the
> driver to use a GPIO descriptor instead and resolve the issue.
> 
> The platform data .shutdown() callback wasn't even used in the
> code, but we encode a shutdown asserting RESET in the remove()
> callback for completeness sake.
> 
> The CBUS also has the ADS7846 touchscreen attached.
> 
> Populate the devices on the Nokia 770 CBUS I2C using software
> nodes instead of platform data quirks. This includes the LCD
> and the ADS7846 touchscreen so the conversion just brings the LCD
> along with it as software nodes is an all-or-nothing design
> pattern.
> 
> The ADS7846 has some limited support for using GPIO descriptors,
> let's convert it over completely to using device properties and then
> fix all remaining boardfile users to provide all platform data using
> software nodes.
> 
> Dump the of includes and of_match_ptr() in the ADS7846 driver as part
> of the job.
> 
> Since we have to move ADS7846 over to obtaining the GPIOs it is
> using exclusively from descriptors, we provide descriptor tables
> for the two remaining in-kernel boardfiles using ADS7846:
> 
> - PXA Spitz
> - MIPS Alchemy DB1000 development board
> 
> It was too hard for me to include software node conversion of
> these two remaining users at this time: the spitz is using a
> hscync callback in the platform data that would require further
> GPIO descriptor conversion of the Spitz, and moving the hsync
> callback down into the driver: it will just become too big of
> a job, but it can be done separately.
> 
> The MIPS Alchemy DB1000 is simply something I cannot test, so take
> the easier approach of just providing some GPIO descriptors in
> this case as I don't want the patch to grow too intrusive.

...

>  #include <linux/gpio.h>

Do we need it after this patch?

>  #include <linux/gpio/machine.h>
> +#include <linux/gpio/property.h>

...

> +static const struct software_node *nokia770_gpiochip_nodes[] = {
> +	&nokia770_mpuio_gpiochip_node,
> +	&nokia770_gpiochip1_node,
> +	&nokia770_gpiochip2_node,
> +	NULL,

Comma is redundant for the terminator entry.

> +};

...

> +static struct gpiod_lookup_table spitz_ads7846_gpio_table = {
> +	.dev_id = "spi2.0",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT,
> +			    "pendown", GPIO_ACTIVE_HIGH),
> +		{ },

Ditto.

> +	},
> +};

...

> +static struct gpiod_lookup_table db1100_touch_gpio_table = {
> +	.dev_id = "spi0.0",
> +	.table = {
> +		GPIO_LOOKUP("alchemy-gpio2", 21,
> +			    "pendown", GPIO_ACTIVE_HIGH),
> +		{ },

Ditto.

> +	},
> +};

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] ARM: omap1: Fix up the Nokia 770 board device IRQs

[andy.shevchenko]

Fri, May 05, 2023 at 01:16:57PM +0200, Linus Walleij kirjoitti:
> The platform devices on the Nokia 770 is using some
> board-specific IRQs that get statically assigned to platform
> devices in the boardfile.
> 
> This does not work with dynamic IRQ chip bases.
> 
> Utilize the NULL device to define some board-specific
> GPIO lookups and use these to immediately look up the
> same GPIOs, convert to IRQ numbers and pass as resources
> to the devices. This is ugly but should work.

...

> +static struct gpiod_lookup_table nokia770_irq_gpio_table = {
> +	.dev_id = NULL,
> +	.table = {
> +		/* GPIO used by SPI device 1 */
> +		GPIO_LOOKUP("gpio-0-15", 15, "ads7846_irq",
> +			    GPIO_ACTIVE_HIGH),
> +		/* GPIO used for retu IRQ */
> +		GPIO_LOOKUP("gpio-48-63", 15, "retu_irq",
> +			    GPIO_ACTIVE_HIGH),
> +		/* GPIO used for tahvo IRQ */
> +		GPIO_LOOKUP("gpio-32-47", 8, "tahvo_irq",
> +			    GPIO_ACTIVE_HIGH),

Missing terminator.

> +	},
> +};

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Linus Walleij]

On Mon, May 8, 2023 at 5:16 PM <andy.shevchenko@gmail.com> wrote:
> Fri, May 05, 2023 at 01:16:55PM +0200, Linus Walleij kirjoitti:

> > The Nokia 770 is using GPIOs from the global numberspace on the
> > CBUS node to pass down to the LCD controller. This regresses when we
> > let the OMAP GPIO driver use dynamic GPIO base.
(...)

> >  #include <linux/gpio.h>
>
> Do we need it after this patch?

Yes, but it is finally removed in patch 3/3!

Fixed the rest, thanks!

Yours,
Linus Walleij

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Linus Walleij]

On Fri, May 5, 2023 at 8:08 PM Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:

> > -     return !gpio_get_value(ts->gpio_pendown);
> > +     return !gpiod_get_value(ts->gpio_pendown);
>
> This needs to be
>
>         return !gpiod_get_value_raw(ts->gpio_pendown);

There is no such function. The gpio descriptor runpath simply assumes that
device trees can be trusted.

> I looked at various DTSes we have and they use a mix of active high and
> active low annotations, so we have to go with the "raw" variant for now,
> and then update to normal one once we update bad DTSes.

I just sighed and fixed all the device trees :D

Yours,
Linus Walleij

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Dmitry Torokhov]

On Mon, May 08, 2023 at 11:23:44PM +0200, Linus Walleij wrote:
> On Fri, May 5, 2023 at 8:08 PM Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> 
> > > -     return !gpio_get_value(ts->gpio_pendown);
> > > +     return !gpiod_get_value(ts->gpio_pendown);
> >
> > This needs to be
> >
> >         return !gpiod_get_value_raw(ts->gpio_pendown);
> 
> There is no such function. The gpio descriptor runpath simply assumes that
> device trees can be trusted.

Sorry, this was supposed to be gpiod_get_raw_value():

https://elixir.bootlin.com/linux/latest/source/drivers/gpio/gpiolib.c#L2854

> 
> > I looked at various DTSes we have and they use a mix of active high and
> > active low annotations, so we have to go with the "raw" variant for now,
> > and then update to normal one once we update bad DTSes.
> 
> I just sighed and fixed all the device trees :D

Yeah, we we can land the DT fixes ahead of the driver change that would
be great. Otherwise we need a temporary application of
gpiod_get_raw_value().

> 
> Yours,
> Linus Walleij

-- 
Dmitry

Re: [PATCH v3 3/3] ARM: omap1: Fix up the Nokia 770 board device IRQs

[Linus Walleij]

On Mon, May 8, 2023 at 5:17 PM <andy.shevchenko@gmail.com> wrote:

> > +             GPIO_LOOKUP("gpio-32-47", 8, "tahvo_irq",
> > +                         GPIO_ACTIVE_HIGH),
>
> Missing terminator.

Darn I missed this comment in v4, I have fixed it in my tree, I will see if
there are more comments for v4 before I resend.

Yours,
Linus Walleij

Re: [PATCH v3 1/3] Input: ads7846 - Convert to use software nodes

[Linus Walleij]

On Mon, May 8, 2023 at 11:28 PM Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> On Mon, May 08, 2023 at 11:23:44PM +0200, Linus Walleij wrote:

> > > This needs to be
> > >
> > >         return !gpiod_get_value_raw(ts->gpio_pendown);
> >
> > There is no such function. The gpio descriptor runpath simply assumes that
> > device trees can be trusted.
>
> Sorry, this was supposed to be gpiod_get_raw_value():
>
> https://elixir.bootlin.com/linux/latest/source/drivers/gpio/gpiolib.c#L2854

I missed it, I should have very well understood you meant that one...
I just read the file too sloppily.

> Yeah, we we can land the DT fixes ahead of the driver change that would
> be great. Otherwise we need a temporary application of
> gpiod_get_raw_value().

If the patch is fine I will send it to the SoC tree and ask for it to be
applied as a fix.

Yours,
Linus Walleij