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