Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi',…

… 'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next

drivers/spi/spi-sun4i.c

@@ -167,6 +167,11 @@ static void sun4i_spi_set_cs(struct spi_device *spi, bool enable)
 	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
 }
 
+static size_t sun4i_spi_max_transfer_size(struct spi_device *spi)
+{
+	return SUN4I_FIFO_DEPTH - 1;
+}
+
 static int sun4i_spi_transfer_one(struct spi_master *master,
 				  struct spi_device *spi,
 				  struct spi_transfer *tfr)
@@ -402,13 +407,16 @@ static int sun4i_spi_probe(struct platform_device *pdev)
 	}
 
 	sspi->master = master;
+	master->max_speed_hz = 100 * 1000 * 1000;
+	master->min_speed_hz = 3 * 1000;
 	master->set_cs = sun4i_spi_set_cs;
 	master->transfer_one = sun4i_spi_transfer_one;
 	master->num_chipselect = 4;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
 	master->bits_per_word_mask = SPI_BPW_MASK(8);
 	master->dev.of_node = pdev->dev.of_node;
 	master->auto_runtime_pm = true;
+	master->max_transfer_size = sun4i_spi_max_transfer_size;
 
 	sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
 	if (IS_ERR(sspi->hclk)) {

drivers/spi/spi-sun6i.c

@@ -153,6 +153,10 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
 	sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg);
 }
 
+static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
+{
+	return SUN6I_FIFO_DEPTH - 1;
+}
 
 static int sun6i_spi_transfer_one(struct spi_master *master,
 				  struct spi_device *spi,
@@ -394,13 +398,16 @@ static int sun6i_spi_probe(struct platform_device *pdev)
 	}
 
 	sspi->master = master;
+	master->max_speed_hz = 100 * 1000 * 1000;
+	master->min_speed_hz = 3 * 1000;
 	master->set_cs = sun6i_spi_set_cs;
 	master->transfer_one = sun6i_spi_transfer_one;
 	master->num_chipselect = 4;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
 	master->bits_per_word_mask = SPI_BPW_MASK(8);
 	master->dev.of_node = pdev->dev.of_node;
 	master->auto_runtime_pm = true;
+	master->max_transfer_size = sun6i_spi_max_transfer_size;
 
 	sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
 	if (IS_ERR(sspi->hclk)) {

drivers/spi/spi-ti-qspi.c

@@ -141,7 +141,7 @@ static int ti_qspi_setup(struct spi_device *spi)
 	u32 clk_ctrl_reg, clk_rate, clk_mask;
 
 	if (spi->master->busy) {
-		dev_dbg(qspi->dev, "master busy doing other trasnfers\n");
+		dev_dbg(qspi->dev, "master busy doing other transfers\n");
 		return -EBUSY;
 	}
 

drivers/spi/spi-topcliff-pch.c

@@ -133,8 +133,6 @@ struct pch_spi_dma_ctrl {
  * @io_remap_addr:		The remapped PCI base address
  * @master:			Pointer to the SPI master structure
  * @work:			Reference to work queue handler
- * @wk:				Workqueue for carrying out execution of the
- *				requests
  * @wait:			Wait queue for waking up upon receiving an
  *				interrupt.
  * @transfer_complete:		Status of SPI Transfer
@@ -169,7 +167,6 @@ struct pch_spi_data {
 	unsigned long io_base_addr;
 	struct spi_master *master;
 	struct work_struct work;
-	struct workqueue_struct *wk;
 	wait_queue_head_t wait;
 	u8 transfer_complete;
 	u8 bcurrent_msg_processing;
@@ -517,8 +514,7 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
 
 	dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
 
-	/* schedule work queue to run */
-	queue_work(data->wk, &data->work);
+	schedule_work(&data->work);
 	dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
 
 	retval = 0;
@@ -674,7 +670,7 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data)
 		 *more messages)
 		 */
 		dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
-		queue_work(data->wk, &data->work);
+		schedule_work(&data->work);
 	} else if (data->board_dat->suspend_sts ||
 		   data->status == STATUS_EXITING) {
 		dev_dbg(&data->master->dev,
@@ -1266,14 +1262,7 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
 {
 	dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
 
-	/* free workqueue */
-	if (data->wk != NULL) {
-		destroy_workqueue(data->wk);
-		data->wk = NULL;
-		dev_dbg(&board_dat->pdev->dev,
-			"%s destroy_workqueue invoked successfully\n",
-			__func__);
-	}
+	flush_work(&data->work);
 }
 
 static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
@@ -1283,14 +1272,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
 
 	dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
 
-	/* create workqueue */
-	data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
-	if (!data->wk) {
-		dev_err(&board_dat->pdev->dev,
-			"%s create_singlet hread_workqueue failed\n", __func__);
-		retval = -EBUSY;
-		goto err_return;
-	}
 
 	/* reset PCH SPI h/w */
 	pch_spi_reset(data->master);
@@ -1299,7 +1280,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
 
 	dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
 
-err_return:
 	if (retval != 0) {
 		dev_err(&board_dat->pdev->dev,
 			"%s FAIL:invoking pch_spi_free_resources\n", __func__);

drivers/spi/spi-txx9.c

@@ -72,7 +72,6 @@
 
 
 struct txx9spi {
-	struct workqueue_struct	*workqueue;
 	struct work_struct work;
 	spinlock_t lock;	/* protect 'queue' */
 	struct list_head queue;
@@ -315,7 +314,7 @@ static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m)
 
 	spin_lock_irqsave(&c->lock, flags);
 	list_add_tail(&m->queue, &c->queue);
-	queue_work(c->workqueue, &c->work);
+	schedule_work(&c->work);
 	spin_unlock_irqrestore(&c->lock, flags);
 
 	return 0;
@@ -374,10 +373,6 @@ static int txx9spi_probe(struct platform_device *dev)
 	if (ret)
 		goto exit;
 
-	c->workqueue = create_singlethread_workqueue(
-				dev_name(master->dev.parent));
-	if (!c->workqueue)
-		goto exit_busy;
 	c->last_chipselect = -1;
 
 	dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n",
@@ -400,8 +395,6 @@ static int txx9spi_probe(struct platform_device *dev)
 exit_busy:
 	ret = -EBUSY;
 exit:
-	if (c->workqueue)
-		destroy_workqueue(c->workqueue);
 	clk_disable(c->clk);
 	spi_master_put(master);
 	return ret;
@@ -412,7 +405,7 @@ static int txx9spi_remove(struct platform_device *dev)
 	struct spi_master *master = platform_get_drvdata(dev);
 	struct txx9spi *c = spi_master_get_devdata(master);
 
-	destroy_workqueue(c->workqueue);
+	flush_work(&c->work);
 	clk_disable(c->clk);
 	return 0;
 }

drivers/spi/spidev.c

@@ -29,6 +29,7 @@
 #include <linux/compat.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/acpi.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spidev.h>
@@ -700,6 +701,43 @@ static const struct of_device_id spidev_dt_ids[] = {
 MODULE_DEVICE_TABLE(of, spidev_dt_ids);
 #endif
 
+#ifdef CONFIG_ACPI
+
+/* Dummy SPI devices not to be used in production systems */
+#define SPIDEV_ACPI_DUMMY	1
+
+static const struct acpi_device_id spidev_acpi_ids[] = {
+	/*
+	 * The ACPI SPT000* devices are only meant for development and
+	 * testing. Systems used in production should have a proper ACPI
+	 * description of the connected peripheral and they should also use
+	 * a proper driver instead of poking directly to the SPI bus.
+	 */
+	{ "SPT0001", SPIDEV_ACPI_DUMMY },
+	{ "SPT0002", SPIDEV_ACPI_DUMMY },
+	{ "SPT0003", SPIDEV_ACPI_DUMMY },
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids);
+
+static void spidev_probe_acpi(struct spi_device *spi)
+{
+	const struct acpi_device_id *id;
+
+	if (!has_acpi_companion(&spi->dev))
+		return;
+
+	id = acpi_match_device(spidev_acpi_ids, &spi->dev);
+	if (WARN_ON(!id))
+		return;
+
+	if (id->driver_data == SPIDEV_ACPI_DUMMY)
+		dev_warn(&spi->dev, "do not use this driver in production systems!\n");
+}
+#else
+static inline void spidev_probe_acpi(struct spi_device *spi) {}
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 static int spidev_probe(struct spi_device *spi)
@@ -719,6 +757,8 @@ static int spidev_probe(struct spi_device *spi)
 			!of_match_device(spidev_dt_ids, &spi->dev));
 	}
 
+	spidev_probe_acpi(spi);
+
 	/* Allocate driver data */
 	spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
 	if (!spidev)
@@ -789,6 +829,7 @@ static struct spi_driver spidev_spi_driver = {
 	.driver = {
 		.name =		"spidev",
 		.of_match_table = of_match_ptr(spidev_dt_ids),
+		.acpi_match_table = ACPI_PTR(spidev_acpi_ids),
 	},
 	.probe =	spidev_probe,
 	.remove =	spidev_remove,