spi/pl022: Add devicetree support

This patch adds device tree support to the spi-pl022 driver.

Based on the initial patch by Alexandre Pereira da Silva <aletes.xgr@gmail.com>

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 85 insertions, 9 deletions

diff --git a/Documentation/devicetree/bindings/spi/spi_pl022.txt b/Documentation/devicetree/bindings/spi/spi_pl022.txt
index 306ec3ff3c0e..877f832c30ae 100644
--- a/Documentation/devicetree/bindings/spi/spi_pl022.txt
+++ b/Documentation/devicetree/bindings/spi/spi_pl022.txt
@@ -6,7 +6,22 @@ Required properties:
 - interrupts : Should contain SPI controller interrupt
 
 Optional properties:
+- num-cs : total number of chipselects
 - cs-gpios : should specify GPIOs used for chipselects.
   The gpios will be referred to as reg = <index> in the SPI child nodes.
   If unspecified, a single SPI device without a chip select can be used.
 
+SPI slave nodes must be children of the SPI master node and can
+contain the following properties.
+
+- pl022,interface : interface type:
+        0: SPI
+        1: Texas Instruments Synchronous Serial Frame Format
+        2: Microwire (Half Duplex)
+- pl022,com-mode : polling, interrupt or dma
+- pl022,rx-level-trig : Rx FIFO watermark level
+- pl022,tx-level-trig : Tx FIFO watermark level
+- pl022,ctrl-len : Microwire interface: Control length
+- pl022,wait-state : Microwire interface: Wait state
+- pl022,duplex : Microwire interface: Full/Half duplex
+
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index cf47802f00c9..959f2acff2d3 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -41,6 +41,7 @@
 #include <linux/scatterlist.h>
 #include <linux/pm_runtime.h>
 #include <linux/gpio.h>
+#include <linux/of_gpio.h>
 
 /*
  * This macro is used to define some register default values.
@@ -1778,12 +1779,14 @@ static const struct pl022_config_chip pl022_default_chip_info = {
 static int pl022_setup(struct spi_device *spi)
 {
         struct pl022_config_chip const *chip_info;
+        struct pl022_config_chip chip_info_dt;
         struct chip_data *chip;
         struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0};
         int status = 0;
         struct pl022 *pl022 = spi_master_get_devdata(spi->master);
         unsigned int bits = spi->bits_per_word;
         u32 tmp;
+        struct device_node *np = spi->dev.of_node;
 
         if (!spi->max_speed_hz)
                 return -EINVAL;
@@ -1806,10 +1809,32 @@ static int pl022_setup(struct spi_device *spi)
         chip_info = spi->controller_data;
 
         if (chip_info == NULL) {
-                chip_info = &pl022_default_chip_info;
-                /* spi_board_info.controller_data not is supplied */
-                dev_dbg(&spi->dev,
-                        "using default controller_data settings\n");
+                if (np) {
+                        chip_info_dt = pl022_default_chip_info;
+
+                        chip_info_dt.hierarchy = SSP_MASTER;
+                        of_property_read_u32(np, "pl022,interface",
+                                &chip_info_dt.iface);
+                        of_property_read_u32(np, "pl022,com-mode",
+                                &chip_info_dt.com_mode);
+                        of_property_read_u32(np, "pl022,rx-level-trig",
+                                &chip_info_dt.rx_lev_trig);
+                        of_property_read_u32(np, "pl022,tx-level-trig",
+                                &chip_info_dt.tx_lev_trig);
+                        of_property_read_u32(np, "pl022,ctrl-len",
+                                &chip_info_dt.ctrl_len);
+                        of_property_read_u32(np, "pl022,wait-state",
+                                &chip_info_dt.wait_state);
+                        of_property_read_u32(np, "pl022,duplex",
+                                &chip_info_dt.duplex);
+
+                        chip_info = &chip_info_dt;
+                } else {
+                        chip_info = &pl022_default_chip_info;
+                        /* spi_board_info.controller_data not is supplied */
+                        dev_dbg(&spi->dev,
+                                "using default controller_data settings\n");
+                }
         } else
                 dev_dbg(&spi->dev,
                         "using user supplied controller_data settings\n");
@@ -2006,7 +2031,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
         struct pl022_ssp_controller *platform_info = adev->dev.platform_data;
         struct spi_master *master;
         struct pl022 *pl022 = NULL;     /*Data for this driver */
-        int status = 0, i;
+        struct device_node *np = adev->dev.of_node;
+        int status = 0, i, num_cs;
 
         dev_info(&adev->dev,
                  "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid);
@@ -2016,9 +2042,19 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
                 goto err_no_pdata;
         }
 
+        if (platform_info->num_chipselect) {
+                num_cs = platform_info->num_chipselect;
+        } else if (IS_ENABLED(CONFIG_OF)) {
+                of_property_read_u32(np, "num-cs", &num_cs);
+        } else {
+                dev_err(&adev->dev, "probe: no chip select defined\n");
+                status = -ENODEV;
+                goto err_no_pdata;
+        }
+
         /* Allocate master with space for data */
         master = spi_alloc_master(dev, sizeof(struct pl022) + sizeof(int) *
-                                  platform_info->num_chipselect);
+                                  num_cs);
         if (master == NULL) {
                 dev_err(&adev->dev, "probe - cannot alloc SPI master\n");
                 status = -ENOMEM;
@@ -2038,17 +2074,41 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
          * on this board
          */
         master->bus_num = platform_info->bus_id;
-        master->num_chipselect = platform_info->num_chipselect;
+        master->num_chipselect = num_cs;
         master->cleanup = pl022_cleanup;
         master->setup = pl022_setup;
         master->prepare_transfer_hardware = pl022_prepare_transfer_hardware;
         master->transfer_one_message = pl022_transfer_one_message;
         master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware;
         master->rt = platform_info->rt;
+        master->dev.of_node = dev->of_node;
 
-        if (platform_info->num_chipselect && platform_info->chipselects)
-                for (i = 0; i < platform_info->num_chipselect; i++)
+        if (platform_info->num_chipselect && platform_info->chipselects) {
+                for (i = 0; i < num_cs; i++)
                         pl022->chipselects[i] = platform_info->chipselects[i];
+        } else if (IS_ENABLED(CONFIG_OF)) {
+                for (i = 0; i < num_cs; i++) {
+                        int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
+
+                        if (cs_gpio == -EPROBE_DEFER) {
+                                status = -EPROBE_DEFER;
+                                goto err_no_gpio;
+                        }
+
+                        pl022->chipselects[i] = cs_gpio;
+
+                        if (gpio_is_valid(cs_gpio)) {
+                                if (gpio_request(cs_gpio, "ssp-pl022"))
+                                        dev_err(&adev->dev,
+                                                "could not request %d gpio\n",
+                                                cs_gpio);
+                                else if (gpio_direction_output(cs_gpio, 1))
+                                        dev_err(&adev->dev,
+                                                "could set gpio %d as output\n",
+                                                cs_gpio);
+                        }
+                }
+        }
 
         /*
          * Supports mode 0-3, loopback, and active low CS. Transfers are
@@ -2158,6 +2218,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
  err_no_ioremap:
         amba_release_regions(adev);
  err_no_ioregion:
+ err_no_gpio:
         spi_master_put(master);
  err_no_master:
  err_no_pdata: