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-rw-r--r--Documentation/devicetree/bindings/spi/spi-bus.txt35
-rw-r--r--Documentation/devicetree/bindings/spi/spi-clps711x.txt33
-rw-r--r--Documentation/devicetree/bindings/spi/spi-davinci.txt2
-rw-r--r--Documentation/devicetree/bindings/spi/ti_qspi.txt2
-rw-r--r--drivers/spi/spi-bfin-sport.c15
-rw-r--r--drivers/spi/spi-bfin5xx.c15
-rw-r--r--drivers/spi/spi-clps711x.c69
7 files changed, 87 insertions, 84 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
index 42d595425dfb..17822860cb98 100644
--- a/Documentation/devicetree/bindings/spi/spi-bus.txt
+++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
@@ -8,11 +8,10 @@ in slave mode.
The SPI master node requires the following properties:
- #address-cells - number of cells required to define a chip select
- address on the SPI bus.
+ address on the SPI bus.
- #size-cells - should be zero.
- compatible - name of SPI bus controller following generic names
- recommended practice.
-- cs-gpios - (optional) gpios chip select.
+ recommended practice.
No other properties are required in the SPI bus node. It is assumed
that a driver for an SPI bus device will understand that it is an SPI bus.
However, the binding does not attempt to define the specific method for
@@ -22,11 +21,12 @@ assumption that board specific platform code will be used to manage
chip selects. Individual drivers can define additional properties to
support describing the chip select layout.
-Optional property:
-- num-cs : total number of chipselects
+Optional properties:
+- cs-gpios - gpios chip select.
+- num-cs - total number of chipselects.
-If cs-gpios is used the number of chip select will automatically increased
-with max(cs-gpios > hw cs)
+If cs-gpios is used the number of chip selects will be increased automatically
+with max(cs-gpios > hw cs).
So if for example the controller has 2 CS lines, and the cs-gpios
property looks like this:
@@ -45,29 +45,30 @@ SPI slave nodes must be children of the SPI master node and can
contain the following properties.
- reg - (required) chip select address of device.
- compatible - (required) name of SPI device following generic names
- recommended practice
-- spi-max-frequency - (required) Maximum SPI clocking speed of device in Hz
+ recommended practice.
+- spi-max-frequency - (required) Maximum SPI clocking speed of device in Hz.
- spi-cpol - (optional) Empty property indicating device requires
- inverse clock polarity (CPOL) mode
+ inverse clock polarity (CPOL) mode.
- spi-cpha - (optional) Empty property indicating device requires
- shifted clock phase (CPHA) mode
+ shifted clock phase (CPHA) mode.
- spi-cs-high - (optional) Empty property indicating device requires
- chip select active high
+ chip select active high.
- spi-3wire - (optional) Empty property indicating device requires
- 3-wire mode.
+ 3-wire mode.
- spi-lsb-first - (optional) Empty property indicating device requires
LSB first mode.
-- spi-tx-bus-width - (optional) The bus width(number of data wires) that
+- spi-tx-bus-width - (optional) The bus width (number of data wires) that is
used for MOSI. Defaults to 1 if not present.
-- spi-rx-bus-width - (optional) The bus width(number of data wires) that
+- spi-rx-bus-width - (optional) The bus width (number of data wires) that is
used for MISO. Defaults to 1 if not present.
- spi-rx-delay-us - (optional) Microsecond delay after a read transfer.
- spi-tx-delay-us - (optional) Microsecond delay after a write transfer.
Some SPI controllers and devices support Dual and Quad SPI transfer mode.
-It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD).
+It allows data in the SPI system to be transferred using 2 wires (DUAL) or 4
+wires (QUAD).
Now the value that spi-tx-bus-width and spi-rx-bus-width can receive is
-only 1(SINGLE), 2(DUAL) and 4(QUAD).
+only 1 (SINGLE), 2 (DUAL) and 4 (QUAD).
Dual/Quad mode is not allowed when 3-wire mode is used.
If a gpio chipselect is used for the SPI slave the gpio number will be passed
diff --git a/Documentation/devicetree/bindings/spi/spi-clps711x.txt b/Documentation/devicetree/bindings/spi/spi-clps711x.txt
new file mode 100644
index 000000000000..4c3ec13f423f
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-clps711x.txt
@@ -0,0 +1,33 @@
+Serial Peripheral Interface on Cirrus Logic CL-PS71xx, EP72xx, EP73xx
+
+Required properties
+- #address-cells: must be <1>
+- #size-cells: must be <0>
+- compatible: should include "cirrus,ep7209-spi"
+- reg: Address and length of one register range
+- interrupts: one interrupt line
+- clocks: One entry, refers to the SPI bus clock
+- cs-gpios: Specifies the gpio pins to be used for chipselects.
+ See: Documentation/devicetree/bindings/spi/spi-bus.txt
+
+An additional register is present in the system controller,
+which is assumed to be in the same device tree, with and marked
+as compatible with "cirrus,ep7209-syscon3".
+
+Example:
+
+spi@80000500 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "cirrus,ep7209-spi";
+ reg = <0x80000500 0x4>;
+ interrupts = <15>;
+ clocks = <&clks CLPS711X_CLK_SPI>;
+ status = "disabled";
+};
+
+syscon3: syscon@80002200 {
+ compatible = "cirrus,ep7209-syscon3", "syscon";
+ reg = <0x80002200 0x40>;
+};
+
diff --git a/Documentation/devicetree/bindings/spi/spi-davinci.txt b/Documentation/devicetree/bindings/spi/spi-davinci.txt
index d1e914adcf6e..f5916c92fe91 100644
--- a/Documentation/devicetree/bindings/spi/spi-davinci.txt
+++ b/Documentation/devicetree/bindings/spi/spi-davinci.txt
@@ -21,7 +21,7 @@ Required properties:
IP to the interrupt controller within the SoC. Possible values
are 0 and 1. Manual says one of the two possible interrupt
lines can be tied to the interrupt controller. Set this
- based on a specifc SoC configuration.
+ based on a specific SoC configuration.
- interrupts: interrupt number mapped to CPU.
- clocks: spi clk phandle
diff --git a/Documentation/devicetree/bindings/spi/ti_qspi.txt b/Documentation/devicetree/bindings/spi/ti_qspi.txt
index 50b14f6b53a3..e65fde4a7388 100644
--- a/Documentation/devicetree/bindings/spi/ti_qspi.txt
+++ b/Documentation/devicetree/bindings/spi/ti_qspi.txt
@@ -20,7 +20,7 @@ Optional properties:
chipselect register and offset of that register.
NOTE: TI QSPI controller requires different pinmux and IODelay
-paramaters for Mode-0 and Mode-3 operations, which needs to be set up by
+parameters for Mode-0 and Mode-3 operations, which needs to be set up by
the bootloader (U-Boot). Default configuration only supports Mode-0
operation. Hence, "spi-cpol" and "spi-cpha" DT properties cannot be
specified in the slave nodes of TI QSPI controller without appropriate
diff --git a/drivers/spi/spi-bfin-sport.c b/drivers/spi/spi-bfin-sport.c
index 6c967555a56a..01d0ba9c5942 100644
--- a/drivers/spi/spi-bfin-sport.c
+++ b/drivers/spi/spi-bfin-sport.c
@@ -64,8 +64,6 @@ struct bfin_sport_spi_master_data {
/* Pin request list */
u16 *pin_req;
- /* Driver message queue */
- struct workqueue_struct *workqueue;
struct work_struct pump_messages;
spinlock_t lock;
struct list_head queue;
@@ -300,7 +298,7 @@ bfin_sport_spi_giveback(struct bfin_sport_spi_master_data *drv_data)
drv_data->cur_msg = NULL;
drv_data->cur_transfer = NULL;
drv_data->cur_chip = NULL;
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
spin_unlock_irqrestore(&drv_data->lock, flags);
if (!drv_data->cs_change)
@@ -556,7 +554,7 @@ bfin_sport_spi_transfer(struct spi_device *spi, struct spi_message *msg)
list_add_tail(&msg->queue, &drv_data->queue);
if (drv_data->run && !drv_data->busy)
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
spin_unlock_irqrestore(&drv_data->lock, flags);
@@ -666,12 +664,7 @@ bfin_sport_spi_init_queue(struct bfin_sport_spi_master_data *drv_data)
tasklet_init(&drv_data->pump_transfers,
bfin_sport_spi_pump_transfers, (unsigned long)drv_data);
- /* init messages workqueue */
INIT_WORK(&drv_data->pump_messages, bfin_sport_spi_pump_messages);
- drv_data->workqueue =
- create_singlethread_workqueue(dev_name(drv_data->master->dev.parent));
- if (drv_data->workqueue == NULL)
- return -EBUSY;
return 0;
}
@@ -694,7 +687,7 @@ bfin_sport_spi_start_queue(struct bfin_sport_spi_master_data *drv_data)
drv_data->cur_chip = NULL;
spin_unlock_irqrestore(&drv_data->lock, flags);
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
return 0;
}
@@ -738,7 +731,7 @@ bfin_sport_spi_destroy_queue(struct bfin_sport_spi_master_data *drv_data)
if (status)
return status;
- destroy_workqueue(drv_data->workqueue);
+ flush_work(&drv_data->pump_messages);
return 0;
}
diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
index 1e91325bf39c..249c7a3677c9 100644
--- a/drivers/spi/spi-bfin5xx.c
+++ b/drivers/spi/spi-bfin5xx.c
@@ -67,8 +67,6 @@ struct bfin_spi_master_data {
/* BFIN hookup */
struct bfin5xx_spi_master *master_info;
- /* Driver message queue */
- struct workqueue_struct *workqueue;
struct work_struct pump_messages;
spinlock_t lock;
struct list_head queue;
@@ -359,7 +357,7 @@ static void bfin_spi_giveback(struct bfin_spi_master_data *drv_data)
drv_data->cur_msg = NULL;
drv_data->cur_transfer = NULL;
drv_data->cur_chip = NULL;
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
spin_unlock_irqrestore(&drv_data->lock, flags);
msg->state = NULL;
@@ -946,7 +944,7 @@ static int bfin_spi_transfer(struct spi_device *spi, struct spi_message *msg)
list_add_tail(&msg->queue, &drv_data->queue);
if (drv_data->running && !drv_data->busy)
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
spin_unlock_irqrestore(&drv_data->lock, flags);
@@ -1177,12 +1175,7 @@ static int bfin_spi_init_queue(struct bfin_spi_master_data *drv_data)
tasklet_init(&drv_data->pump_transfers,
bfin_spi_pump_transfers, (unsigned long)drv_data);
- /* init messages workqueue */
INIT_WORK(&drv_data->pump_messages, bfin_spi_pump_messages);
- drv_data->workqueue = create_singlethread_workqueue(
- dev_name(drv_data->master->dev.parent));
- if (drv_data->workqueue == NULL)
- return -EBUSY;
return 0;
}
@@ -1204,7 +1197,7 @@ static int bfin_spi_start_queue(struct bfin_spi_master_data *drv_data)
drv_data->cur_chip = NULL;
spin_unlock_irqrestore(&drv_data->lock, flags);
- queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ schedule_work(&drv_data->pump_messages);
return 0;
}
@@ -1246,7 +1239,7 @@ static int bfin_spi_destroy_queue(struct bfin_spi_master_data *drv_data)
if (status != 0)
return status;
- destroy_workqueue(drv_data->workqueue);
+ flush_work(&drv_data->pump_messages);
return 0;
}
diff --git a/drivers/spi/spi-clps711x.c b/drivers/spi/spi-clps711x.c
index 8c30de0315e7..18193df2eba8 100644
--- a/drivers/spi/spi-clps711x.c
+++ b/drivers/spi/spi-clps711x.c
@@ -1,7 +1,7 @@
/*
* CLPS711X SPI bus driver
*
- * Copyright (C) 2012-2014 Alexander Shiyan <shc_work@mail.ru>
+ * Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -12,7 +12,6 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/gpio.h>
-#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
@@ -20,9 +19,8 @@
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/clps711x.h>
#include <linux/spi/spi.h>
-#include <linux/platform_data/spi-clps711x.h>
-#define DRIVER_NAME "spi-clps711x"
+#define DRIVER_NAME "clps711x-spi"
#define SYNCIO_FRMLEN(x) ((x) << 8)
#define SYNCIO_TXFRMEN (1 << 14)
@@ -40,6 +38,17 @@ struct spi_clps711x_data {
static int spi_clps711x_setup(struct spi_device *spi)
{
+ if (!spi->controller_state) {
+ int ret;
+
+ ret = devm_gpio_request(&spi->master->dev, spi->cs_gpio,
+ dev_name(&spi->master->dev));
+ if (ret)
+ return ret;
+
+ spi->controller_state = spi;
+ }
+
/* We are expect that SPI-device is not selected */
gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
@@ -104,20 +113,9 @@ static irqreturn_t spi_clps711x_isr(int irq, void *dev_id)
static int spi_clps711x_probe(struct platform_device *pdev)
{
struct spi_clps711x_data *hw;
- struct spi_clps711x_pdata *pdata = dev_get_platdata(&pdev->dev);
struct spi_master *master;
struct resource *res;
- int i, irq, ret;
-
- if (!pdata) {
- dev_err(&pdev->dev, "No platform data supplied\n");
- return -EINVAL;
- }
-
- if (pdata->num_chipselect < 1) {
- dev_err(&pdev->dev, "At least one CS must be defined\n");
- return -EINVAL;
- }
+ int irq, ret;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@@ -127,40 +125,24 @@ static int spi_clps711x_probe(struct platform_device *pdev)
if (!master)
return -ENOMEM;
- master->cs_gpios = devm_kzalloc(&pdev->dev, sizeof(int) *
- pdata->num_chipselect, GFP_KERNEL);
- if (!master->cs_gpios) {
- ret = -ENOMEM;
- goto err_out;
- }
-
- master->bus_num = pdev->id;
+ master->bus_num = -1;
master->mode_bits = SPI_CPHA | SPI_CS_HIGH;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 8);
- master->num_chipselect = pdata->num_chipselect;
+ master->dev.of_node = pdev->dev.of_node;
master->setup = spi_clps711x_setup;
master->prepare_message = spi_clps711x_prepare_message;
master->transfer_one = spi_clps711x_transfer_one;
hw = spi_master_get_devdata(master);
- for (i = 0; i < master->num_chipselect; i++) {
- master->cs_gpios[i] = pdata->chipselect[i];
- ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i],
- DRIVER_NAME);
- if (ret) {
- dev_err(&pdev->dev, "Can't get CS GPIO %i\n", i);
- goto err_out;
- }
- }
-
hw->spi_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(hw->spi_clk)) {
ret = PTR_ERR(hw->spi_clk);
goto err_out;
}
- hw->syscon = syscon_regmap_lookup_by_pdevname("syscon.3");
+ hw->syscon =
+ syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon3");
if (IS_ERR(hw->syscon)) {
ret = PTR_ERR(hw->syscon);
goto err_out;
@@ -185,14 +167,8 @@ static int spi_clps711x_probe(struct platform_device *pdev)
goto err_out;
ret = devm_spi_register_master(&pdev->dev, master);
- if (!ret) {
- dev_info(&pdev->dev,
- "SPI bus driver initialized. Master clock %u Hz\n",
- master->max_speed_hz);
+ if (!ret)
return 0;
- }
-
- dev_err(&pdev->dev, "Failed to register master\n");
err_out:
spi_master_put(master);
@@ -200,9 +176,16 @@ err_out:
return ret;
}
+static const struct of_device_id clps711x_spi_dt_ids[] = {
+ { .compatible = "cirrus,ep7209-spi", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, clps711x_spi_dt_ids);
+
static struct platform_driver clps711x_spi_driver = {
.driver = {
.name = DRIVER_NAME,
+ .of_match_table = clps711x_spi_dt_ids,
},
.probe = spi_clps711x_probe,
};
generated by cgit (git 2.34.1) at 2025-06-10 12:52:27 +0000