board/czechlight/clearfog/patches/linux.patch

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
index 625a22e2f211..7872d61d23e4 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
@@ -144,3 +144,38 @@ gpio21: gpio@21 {
 		bias-pull-up;
 	};
 };
+
+Line naming
+===========
+
+Because several gpio_chip instances are hidden below a single device tree
+node, it is necessary to split the names into several child nodes. Ensure
+that the configured addresses match those in the microchip,spi-present-mask:
+
+gpio@0 {
+        compatible = "microchip,mcp23s17";
+        gpio-controller;
+        #gpio-cells = <2>;
+	/* this bitmask has bits #0 (0x01) and #2 (0x04) set */
+        spi-present-mask = <0x05>;
+        reg = <0>;
+        spi-max-frequency = <1000000>;
+
+	gpio-bank@1 {
+		address = <0>;
+		gpio-line-names =
+			"GPA0",
+			"GPA1",
+			...
+			"GPA7",
+			"GPB0",
+			"GPB1",
+			...
+			"GPB7";
+	};
+
+	gpio-bank@2 {
+		address = <2>;
+		gpio-line-names = ...
+	};
+};
diff --git a/Documentation/devicetree/bindings/spi/spi-orion.txt b/Documentation/devicetree/bindings/spi/spi-orion.txt
index 8434a65fc12a..ed35cba1bc33 100644
--- a/Documentation/devicetree/bindings/spi/spi-orion.txt
+++ b/Documentation/devicetree/bindings/spi/spi-orion.txt
@@ -29,6 +29,10 @@ Optional properties:
 		used, the name must be "core", and "axi" (the latter
 		is only for Armada 7K/8K).
 
+Optional properties of child nodes (SPI slave devices):
+- linux,spi-wdelay : If present and non-zero, specifies a delay in
+		     microseconds between words transferred over the SPI bus.
+
 
 Example:
        spi@10600 {
@@ -77,3 +81,19 @@ are used in the default indirect (PIO) mode):
 For further information on the MBus bindings, please see the MBus
 DT documentation:
 Documentation/devicetree/bindings/bus/mvebu-mbus.txt
+
+Example of a per-child inter-word delay:
+
+	spi0: spi@10600 {
+		/* ... */
+
+		some_slave_device@2 {
+			reg = <2>;
+			compatible = "something";
+			/* ... */
+
+			/* Wait 3 microseconds between all words within all
+			SPI transactions */
+			linux,spi-wdelay = /bits/ 16 <3>;
+		};
+	};
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index a5a95ea5b81a..469374ded7ae 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -317,6 +317,14 @@ mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
 		drv_data->rc = -ENXIO;
 		break;
 
+	case MV64XXX_I2C_STATUS_BUS_ERR: /* 0x00 */
+		dev_warn(&drv_data->adapter.dev,
+			 "bus error: slave has driven SDA/SCL unexpectedly\n");
+		drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
+		mv64xxx_i2c_hw_init(drv_data);
+		drv_data->rc = -EIO;
+		break;
+
 	default:
 		dev_err(&drv_data->adapter.dev,
 			"mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index f5357f6d9e58..efbe9c83c514 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -42,6 +42,9 @@
 
 #define ldev_to_led(c)		container_of(c, struct tlc591xx_led, ldev)
 
+#define TLC591XX_RESET_BYTE_0	0xa5
+#define TLC591XX_RESET_BYTE_1	0x5a
+
 struct tlc591xx_led {
 	bool active;
 	unsigned int led_no;
@@ -53,21 +56,25 @@ struct tlc591xx_priv {
 	struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
 	struct regmap *regmap;
 	unsigned int reg_ledout_offset;
+	struct i2c_client *swrst_client;
 };
 
 struct tlc591xx {
 	unsigned int max_leds;
 	unsigned int reg_ledout_offset;
+	u8 swrst_addr;
 };
 
 static const struct tlc591xx tlc59116 = {
 	.max_leds = 16,
 	.reg_ledout_offset = 0x14,
+	.swrst_addr = 0x6b,
 };
 
 static const struct tlc591xx tlc59108 = {
 	.max_leds = 8,
 	.reg_ledout_offset = 0x0c,
+	.swrst_addr = 0x4b,
 };
 
 static int
@@ -140,6 +147,8 @@ tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
 		if (priv->leds[i].active)
 			led_classdev_unregister(&priv->leds[i].ldev);
 	}
+
+	i2c_unregister_device(priv->swrst_client);
 }
 
 static int
@@ -245,6 +254,19 @@ tlc591xx_probe(struct i2c_client *client,
 		priv->leds[reg].ldev.default_trigger =
 			of_get_property(child, "linux,default-trigger", NULL);
 	}
+
+	priv->swrst_client = i2c_new_dummy(client->adapter, tlc591xx->swrst_addr);
+	if (priv->swrst_client) {
+		err = i2c_smbus_write_byte_data(priv->swrst_client,
+				TLC591XX_RESET_BYTE_0, TLC591XX_RESET_BYTE_1);
+		if (err) {
+			dev_warn(dev, "SW reset failed\n");
+		}
+	} else {
+		dev_info(dev, "Skipping reset: address %02x already used\n",
+				tlc591xx->swrst_addr);
+	}
+
 	return tlc591xx_configure(dev, priv, tlc591xx);
 }
 
diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index cf73a403d22d..250e5e536a9c 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -16,6 +16,7 @@
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinconf-generic.h>
+#include "../gpio/gpiolib.h"
 
 /*
  * MCP types supported by driver
@@ -265,7 +266,6 @@ static int mcp_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 		status = (data & BIT(pin)) ? 1 : 0;
 		break;
 	default:
-		dev_err(mcp->dev, "Invalid config param %04x\n", param);
 		return -ENOTSUPP;
 	}
 
@@ -292,7 +292,7 @@ static int mcp_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			ret = mcp_set_bit(mcp, MCP_GPPU, pin, arg);
 			break;
 		default:
-			dev_err(mcp->dev, "Invalid config param %04x\n", param);
+			dev_dbg(mcp->dev, "Invalid config param %04x\n", param);
 			return -ENOTSUPP;
 		}
 	}
@@ -664,115 +664,6 @@ static int mcp23s08_irqchip_setup(struct mcp23s08 *mcp)
 
 /*----------------------------------------------------------------------*/
 
-#ifdef CONFIG_DEBUG_FS
-
-#include <linux/seq_file.h>
-
-/*
- * This compares the chip's registers with the register
- * cache and corrects any incorrectly set register. This
- * can be used to fix state for MCP23xxx, that temporary
- * lost its power supply.
- */
-#define MCP23S08_CONFIG_REGS 7
-static int __check_mcp23s08_reg_cache(struct mcp23s08 *mcp)
-{
-	int cached[MCP23S08_CONFIG_REGS];
-	int err = 0, i;
-
-	/* read cached config registers */
-	for (i = 0; i < MCP23S08_CONFIG_REGS; i++) {
-		err = mcp_read(mcp, i, &cached[i]);
-		if (err)
-			goto out;
-	}
-
-	regcache_cache_bypass(mcp->regmap, true);
-
-	for (i = 0; i < MCP23S08_CONFIG_REGS; i++) {
-		int uncached;
-		err = mcp_read(mcp, i, &uncached);
-		if (err)
-			goto out;
-
-		if (uncached != cached[i]) {
-			dev_err(mcp->dev, "restoring reg 0x%02x from 0x%04x to 0x%04x (power-loss?)\n",
-				i, uncached, cached[i]);
-			mcp_write(mcp, i, cached[i]);
-		}
-	}
-
-out:
-	if (err)
-		dev_err(mcp->dev, "read error: reg=%02x, err=%d", i, err);
-	regcache_cache_bypass(mcp->regmap, false);
-	return err;
-}
-
-/*
- * This shows more info than the generic gpio dump code:
- * pullups, deglitching, open drain drive.
- */
-static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
-{
-	struct mcp23s08	*mcp;
-	char		bank;
-	int		t;
-	unsigned	mask;
-	int iodir, gpio, gppu;
-
-	mcp = gpiochip_get_data(chip);
-
-	/* NOTE: we only handle one bank for now ... */
-	bank = '0' + ((mcp->addr >> 1) & 0x7);
-
-	mutex_lock(&mcp->lock);
-
-	t = __check_mcp23s08_reg_cache(mcp);
-	if (t) {
-		seq_printf(s, " I/O Error\n");
-		goto done;
-	}
-	t = mcp_read(mcp, MCP_IODIR, &iodir);
-	if (t) {
-		seq_printf(s, " I/O Error\n");
-		goto done;
-	}
-	t = mcp_read(mcp, MCP_GPIO, &gpio);
-	if (t) {
-		seq_printf(s, " I/O Error\n");
-		goto done;
-	}
-	t = mcp_read(mcp, MCP_GPPU, &gppu);
-	if (t) {
-		seq_printf(s, " I/O Error\n");
-		goto done;
-	}
-
-	for (t = 0, mask = BIT(0); t < chip->ngpio; t++, mask <<= 1) {
-		const char *label;
-
-		label = gpiochip_is_requested(chip, t);
-		if (!label)
-			continue;
-
-		seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s\n",
-			   chip->base + t, bank, t, label,
-			   (iodir & mask) ? "in " : "out",
-			   (gpio & mask) ? "hi" : "lo",
-			   (gppu & mask) ? "up" : "  ");
-		/* NOTE:  ignoring the irq-related registers */
-	}
-done:
-	mutex_unlock(&mcp->lock);
-}
-
-#else
-#define mcp23s08_dbg_show	NULL
-#endif
-
-/*----------------------------------------------------------------------*/
-
 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 			      void *data, unsigned addr, unsigned type,
 			      unsigned int base, int cs)
@@ -793,7 +684,6 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 	mcp->chip.get = mcp23s08_get;
 	mcp->chip.direction_output = mcp23s08_direction_output;
 	mcp->chip.set = mcp23s08_set;
-	mcp->chip.dbg_show = mcp23s08_dbg_show;
 #ifdef CONFIG_OF_GPIO
 	mcp->chip.of_gpio_n_cells = 2;
 	mcp->chip.of_node = dev->of_node;
@@ -1099,6 +989,7 @@ static int mcp23s08_probe(struct spi_device *spi)
 	int				status, type;
 	unsigned			ngpio = 0;
 	const struct			of_device_id *match;
+	struct device_node		*np;
 
 	match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
 	if (match)
@@ -1161,6 +1052,16 @@ static int mcp23s08_probe(struct spi_device *spi)
 		if (pdata->base != -1)
 			pdata->base += data->mcp[addr]->chip.ngpio;
 		ngpio += data->mcp[addr]->chip.ngpio;
+
+		for_each_available_child_of_node(spi->dev.of_node, np) {
+			u32 chip_addr;
+			status = of_property_read_u32(np, "address", &chip_addr);
+			if (status)
+				continue;
+			if (chip_addr != addr)
+				continue;
+			devprop_gpiochip_set_names(&data->mcp[addr]->chip, of_fwnode_handle(np));
+		}
 	}
 	data->ngpio = ngpio;
 
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index 47ef6b1a2e76..d28ecdf3bafc 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -93,6 +93,7 @@ struct orion_direct_acc {
 
 struct orion_child_options {
 	struct orion_direct_acc direct_access;
+	u16			word_delay;
 };
 
 struct orion_spi {
@@ -432,7 +433,7 @@ orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
 	struct orion_spi *orion_spi;
 	int cs = spi->chip_select;
 
-	word_len = spi->bits_per_word;
+	word_len = xfer->bits_per_word;
 	count = xfer->len;
 
 	orion_spi = spi_master_get_devdata(spi->master);
@@ -470,6 +471,8 @@ orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
 			if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0)
 				goto out;
 			count--;
+			if (orion_spi->child[cs].word_delay)
+				udelay(orion_spi->child[cs].word_delay);
 		} while (count);
 	} else if (word_len == 16) {
 		const u16 *tx = xfer->tx_buf;
@@ -478,6 +481,8 @@ orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
 		do {
 			if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0)
 				goto out;
+			if (orion_spi->child[cs].word_delay)
+				udelay(orion_spi->child[cs].word_delay);
 			count -= 2;
 		} while (count);
 	}
@@ -733,6 +738,12 @@ static int orion_spi_probe(struct platform_device *pdev)
 			}
 		}
 
+		spi->child[cs].word_delay = 0;
+		if (!of_property_read_u16(np, "linux,spi-wdelay",
+					&spi->child[cs].word_delay))
+			dev_info(&pdev->dev, "%pOF: %dus delay between words\n",
+					np, spi->child[cs].word_delay);
+
 		/*
 		 * Check if an address is configured for this SPI device. If
 		 * not, the MBus mapping via the 'ranges' property in the 'soc'
@@ -744,6 +755,12 @@ static int orion_spi_probe(struct platform_device *pdev)
 		if (status)
 			continue;
 
+		if (spi->child[cs].word_delay) {
+			dev_warn(&pdev->dev,
+				"%pOF linux,spi-wdelay takes preference over a direct-mode", np);
+			continue;
+		}
+
 		/*
 		 * Only map one page for direct access. This is enough for the
 		 * simple TX transfer which only writes to the first word.
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 9da0bc5a036c..097883f1fabd 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -60,6 +60,7 @@ static void spidev_release(struct device *dev)
 		spi->controller->cleanup(spi);
 
 	spi_controller_put(spi->controller);
+	kfree(spi->driver_override);
 	kfree(spi);
 }
 
@@ -77,6 +78,58 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
 }
 static DEVICE_ATTR_RO(modalias);
 
+static ssize_t driver_override_store(struct device *dev,
+				     struct device_attribute *a,
+				     const char *buf, size_t count)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	const char *end = memchr(buf, '\n', count);
+	const size_t len = end ? end - buf : count;
+	const char *driver_override, *old;
+	int ret;
+
+	/* We need to keep extra room for a newline when displaying value */
+	if (len >= (PAGE_SIZE - 1))
+		return -EINVAL;
+
+	driver_override = kstrndup(buf, len, GFP_KERNEL);
+	if (!driver_override)
+		return -ENOMEM;
+
+	device_lock(dev);
+	old = spi->driver_override;
+	if (len) {
+		spi->driver_override = driver_override;
+	} else {
+		/* Emptry string, disable driver override */
+		spi->driver_override = NULL;
+		kfree(driver_override);
+	}
+	device_unlock(dev);
+	kfree(old);
+
+	/* Attach device to new driver if it's not already attached */
+	ret = device_attach(dev);
+	if (ret < 0 && ret != -EPROBE_DEFER)
+		dev_warn(dev, "device attach to '%s' failed (%d)\n",
+			 spi->driver_override, ret);
+
+	return count;
+}
+
+static ssize_t driver_override_show(struct device *dev,
+				    struct device_attribute *a, char *buf)
+{
+	const struct spi_device *spi = to_spi_device(dev);
+	ssize_t len;
+
+	device_lock(dev);
+	len = snprintf(buf, PAGE_SIZE, "%s\n", spi->driver_override ? : "");
+	device_unlock(dev);
+	return len;
+}
+static DEVICE_ATTR_RW(driver_override);
+
 #define SPI_STATISTICS_ATTRS(field, file)				\
 static ssize_t spi_controller_##field##_show(struct device *dev,	\
 					     struct device_attribute *attr, \
@@ -158,6 +211,7 @@ SPI_STATISTICS_SHOW(transfers_split_maxsize, "%lu");
 
 static struct attribute *spi_dev_attrs[] = {
 	&dev_attr_modalias.attr,
+	&dev_attr_driver_override.attr,
 	NULL,
 };
 
@@ -305,6 +359,10 @@ static int spi_match_device(struct device *dev, struct device_driver *drv)
 	const struct spi_device	*spi = to_spi_device(dev);
 	const struct spi_driver	*sdrv = to_spi_driver(drv);
 
+	/* Check override first, and if set, only use the named driver */
+	if (spi->driver_override)
+		return strcmp(spi->driver_override, drv->name) == 0;
+
 	/* Attempt an OF style match */
 	if (of_driver_match_device(dev, drv))
 		return 1;
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index cda10719d1d1..c5fe08bc34a0 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -724,11 +724,9 @@ static int spidev_probe(struct spi_device *spi)
 	 * compatible string, it is a Linux implementation thing
 	 * rather than a description of the hardware.
 	 */
-	if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
-		dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
-		WARN_ON(spi->dev.of_node &&
-			!of_match_device(spidev_dt_ids, &spi->dev));
-	}
+	WARN(spi->dev.of_node &&
+	     of_device_is_compatible(spi->dev.of_node, "spidev"),
+	     "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node);
 
 	spidev_probe_acpi(spi);
 
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index a64235e05321..e28f7c5d6eb6 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -167,6 +167,7 @@ struct spi_device {
 	void			*controller_state;
 	void			*controller_data;
 	char			modalias[SPI_NAME_SIZE];
+	const char		*driver_override;
 	int			cs_gpio;	/* chip select gpio */
 
 	/* the statistics */