b50fd8c2b3
Register SPI controllers through device tree. We will wire up the clocks at a later stage. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
98 lines
2.9 KiB
Diff
98 lines
2.9 KiB
Diff
From 3353228a04a004ec67073871f40cf58dc4e209aa Mon Sep 17 00:00:00 2001
|
|
From: Jonas Gorski <jonas.gorski@gmail.com>
|
|
Date: Mon, 7 Sep 2015 21:01:38 +0200
|
|
Subject: [PATCH 4/8] spi/bcm63xx: add support for probing through devicetree
|
|
|
|
Add required binding support to probe through device tree.
|
|
|
|
Use the compatible instead of the resource size for identifiying the
|
|
block type, and allow reducing the number of cs lines through OF.
|
|
|
|
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
|
|
---
|
|
drivers/spi/spi-bcm63xx.c | 42 ++++++++++++++++++++++++++++++++++++------
|
|
1 file changed, 36 insertions(+), 6 deletions(-)
|
|
|
|
--- a/drivers/spi/spi-bcm63xx.c
|
|
+++ b/drivers/spi/spi-bcm63xx.c
|
|
@@ -26,6 +26,7 @@
|
|
#include <linux/completion.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pm_runtime.h>
|
|
+#include <linux/of.h>
|
|
|
|
/* BCM 6338/6348 SPI core */
|
|
#define SPI_6348_RSET_SIZE 64
|
|
@@ -485,21 +486,48 @@ static const struct platform_device_id b
|
|
},
|
|
};
|
|
|
|
+static const struct of_device_id bcm63xx_spi_of_match[] = {
|
|
+ { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets },
|
|
+ { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets },
|
|
+ { },
|
|
+};
|
|
+
|
|
static int bcm63xx_spi_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *r;
|
|
const unsigned long *bcm63xx_spireg;
|
|
struct device *dev = &pdev->dev;
|
|
- int irq;
|
|
+ int irq, bus_num;
|
|
struct spi_master *master;
|
|
struct clk *clk;
|
|
struct bcm63xx_spi *bs;
|
|
int ret;
|
|
+ u32 num_cs = BCM63XX_SPI_MAX_CS;
|
|
|
|
- if (!pdev->id_entry->driver_data)
|
|
- return -EINVAL;
|
|
+ if (dev->of_node) {
|
|
+ const struct of_device_id *match;
|
|
|
|
- bcm63xx_spireg = (const unsigned long *)pdev->id_entry->driver_data;
|
|
+ match = of_match_node(bcm63xx_spi_of_match, dev->of_node);
|
|
+ if (!match)
|
|
+ return -EINVAL;
|
|
+ bcm63xx_spireg = match->data;
|
|
+
|
|
+ of_property_read_u32(dev->of_node, "num-cs", &num_cs);
|
|
+ if (num_cs > BCM63XX_SPI_MAX_CS) {
|
|
+ dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
|
|
+ num_cs);
|
|
+ num_cs = BCM63XX_SPI_MAX_CS;
|
|
+ }
|
|
+
|
|
+ bus_num = -1;
|
|
+ } else if (pdev->id_entry->driver_data) {
|
|
+ const struct platform_device_id *match = pdev->id_entry;
|
|
+
|
|
+ bcm63xx_spireg = (const unsigned long *)match->driver_data;
|
|
+ bus_num = BCM63XX_SPI_BUS_NUM;
|
|
+ } else {
|
|
+ return -EINVAL;
|
|
+ }
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
@@ -544,8 +572,9 @@ static int bcm63xx_spi_probe(struct plat
|
|
goto out_err;
|
|
}
|
|
|
|
- master->bus_num = BCM63XX_SPI_BUS_NUM;
|
|
- master->num_chipselect = BCM63XX_SPI_MAX_CS;
|
|
+ master->dev.of_node = dev->of_node;
|
|
+ master->bus_num = bus_num;
|
|
+ master->num_chipselect = num_cs;
|
|
master->transfer_one_message = bcm63xx_spi_transfer_one;
|
|
master->mode_bits = MODEBITS;
|
|
master->bits_per_word_mask = SPI_BPW_MASK(8);
|
|
@@ -634,6 +663,7 @@ static struct platform_driver bcm63xx_sp
|
|
.driver = {
|
|
.name = "bcm63xx-spi",
|
|
.pm = &bcm63xx_spi_pm_ops,
|
|
+ .of_match_table = bcm63xx_spi_of_match,
|
|
},
|
|
.id_table = bcm63xx_spi_dev_match,
|
|
.probe = bcm63xx_spi_probe,
|