Merge tag 'spi-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "Lots of stuff going on in the core for SPI this time around, the two
  big changes both being around time in different forms:

   - A rework of delay times from Alexandru Ardelean which makes the
     ways in which they are specified more consistent between drivers so
     that what's available to clients is less dependent on the hardware
     implementation.

   - Support for PTP timestamping of transfers from Vladimir Oltean,
     useful for use with precision clocks with SPI control interfaces.

   - Big cleanups for the Atmel, PXA2xx and Zynq QSPI drivers"

* tag 'spi-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (119 commits)
  dt-bindings: spi: Convert stm32 QSPI bindings to json-schema
  spi: pic32: Retire dma_request_slave_channel_compat()
  spi: Fix Kconfig indentation
  spi: mediatek: add SPI_CS_HIGH support
  spi: st-ssc4: add missed pm_runtime_disable
  spi: tegra20-slink: add missed clk_unprepare
  spi: tegra20-slink: Use dma_request_chan() directly for channel request
  spi: tegra114: Use dma_request_chan() directly for channel request
  spi: s3c64xx: Use dma_request_chan() directly for channel request
  spi: qup: Use dma_request_chan() directly for channel request
  spi: pl022: Use dma_request_chan() directly for channel request
  spi: imx: Use dma_request_chan() directly for channel request
  spi: fsl-lpspi: Use dma_request_chan() directly for channel request
  spi: atmel: Use dma_request_chan() directly for channel request
  spi: at91-usart: Use dma_request_chan() directly for channel request
  spi: fsl-cpm: Correct the free:ing
  spi: Fix regression to return zero on success instead of positive value
  spi: pxa2xx: Add missed security checks
  spi: nxp-fspi: Use devm API to fix missed unregistration of controller
  spi: omap2-mcspi: Remove redundant checks
  ...

1 files changed, 59 insertions, 19 deletions

diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c
index 51759d3fd45f..3606232f190f 100644
--- a/drivers/spi/spi-txx9.c
+++ b/drivers/spi/spi-txx9.c
@@ -26,7 +26,8 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
-#include <linux/gpio.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
 
 
 #define SPI_FIFO_SIZE 4
@@ -79,7 +80,7 @@ struct txx9spi {
 	void __iomem *membase;
 	int baseclk;
 	struct clk *clk;
-	int last_chipselect;
+	struct gpio_desc *last_chipselect;
 	int last_chipselect_val;
 };
 
@@ -95,20 +96,22 @@ static void txx9spi_wr(struct txx9spi *c, u32 val, int reg)
 static void txx9spi_cs_func(struct spi_device *spi, struct txx9spi *c,
 		int on, unsigned int cs_delay)
 {
-	int val = (spi->mode & SPI_CS_HIGH) ? on : !on;
-
+	/*
+	 * The GPIO descriptor will track polarity inversion inside
+	 * gpiolib.
+	 */
 	if (on) {
 		/* deselect the chip with cs_change hint in last transfer */
-		if (c->last_chipselect >= 0)
-			gpio_set_value(c->last_chipselect,
+		if (c->last_chipselect)
+			gpiod_set_value(c->last_chipselect,
 					!c->last_chipselect_val);
-		c->last_chipselect = spi->chip_select;
-		c->last_chipselect_val = val;
+		c->last_chipselect = spi->cs_gpiod;
+		c->last_chipselect_val = on;
 	} else {
-		c->last_chipselect = -1;
+		c->last_chipselect = NULL;
 		ndelay(cs_delay);	/* CS Hold Time */
 	}
-	gpio_set_value(spi->chip_select, val);
+	gpiod_set_value(spi->cs_gpiod, on);
 	ndelay(cs_delay);	/* CS Setup Time / CS Recovery Time */
 }
 
@@ -119,12 +122,6 @@ static int txx9spi_setup(struct spi_device *spi)
 	if (!spi->max_speed_hz)
 		return -EINVAL;
 
-	if (gpio_direction_output(spi->chip_select,
-			!(spi->mode & SPI_CS_HIGH))) {
-		dev_err(&spi->dev, "Cannot setup GPIO for chipselect.\n");
-		return -EINVAL;
-	}
-
 	/* deselect chip */
 	spin_lock(&c->lock);
 	txx9spi_cs_func(spi, c, 0, (NSEC_PER_SEC / 2) / spi->max_speed_hz);
@@ -248,8 +245,7 @@ static void txx9spi_work_one(struct txx9spi *c, struct spi_message *m)
 			len -= count * wsize;
 		}
 		m->actual_length += t->len;
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (!cs_change)
 			continue;
@@ -320,6 +316,47 @@ static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m)
 	return 0;
 }
 
+/*
+ * Chip select uses GPIO only, further the driver is using the chip select
+ * numer (from the device tree "reg" property, and this can only come from
+ * device tree since this i MIPS and there is no way to pass platform data) as
+ * the GPIO number. As the platform has only one GPIO controller (the txx9 GPIO
+ * chip) it is thus using the chip select number as an offset into that chip.
+ * This chip has a maximum of 16 GPIOs 0..15 and this is what all platforms
+ * register.
+ *
+ * We modernized this behaviour by explicitly converting that offset to an
+ * offset on the GPIO chip using a GPIO descriptor machine table of the same
+ * size as the txx9 GPIO chip with a 1-to-1 mapping of chip select to GPIO
+ * offset.
+ *
+ * This is admittedly a hack, but it is countering the hack of using "reg" to
+ * contain a GPIO offset when it should be using "cs-gpios" as the SPI bindings
+ * state.
+ */
+static struct gpiod_lookup_table txx9spi_cs_gpio_table = {
+	.dev_id = "spi0",
+	.table = {
+		GPIO_LOOKUP_IDX("TXx9", 0, "cs", 0, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 1, "cs", 1, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 2, "cs", 2, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 3, "cs", 3, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 4, "cs", 4, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 5, "cs", 5, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 6, "cs", 6, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 7, "cs", 7, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 8, "cs", 8, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 9, "cs", 9, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 10, "cs", 10, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 11, "cs", 11, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 12, "cs", 12, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 13, "cs", 13, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 14, "cs", 14, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("TXx9", 15, "cs", 15, GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
 static int txx9spi_probe(struct platform_device *dev)
 {
 	struct spi_master *master;
@@ -373,12 +410,14 @@ static int txx9spi_probe(struct platform_device *dev)
 	if (ret)
 		goto exit;
 
-	c->last_chipselect = -1;
+	c->last_chipselect = NULL;
 
 	dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n",
 		 (unsigned long long)res->start, irq,
 		 (c->baseclk + 500000) / 1000000);
 
+	gpiod_add_lookup_table(&txx9spi_cs_gpio_table);
+
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA;
 
@@ -387,6 +426,7 @@ static int txx9spi_probe(struct platform_device *dev)
 	master->transfer = txx9spi_transfer;
 	master->num_chipselect = (u16)UINT_MAX; /* any GPIO numbers */
 	master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
+	master->use_gpio_descriptors = true;
 
 	ret = devm_spi_register_master(&dev->dev, master);
 	if (ret)