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77 lines
2.3 KiB
Diff
77 lines
2.3 KiB
Diff
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From 776041498c2b285a7f745c924e10fc11ef720eae Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Thu, 10 Sep 2015 14:53:53 +0200
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Subject: [PATCH 3/3] spi/bcm63xx-hsspi: allow for probing through devicetree
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Add required binding support to probe through device tree.
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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-hsspi.c | 23 ++++++++++++++++++++---
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1 file changed, 20 insertions(+), 3 deletions(-)
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--- a/drivers/spi/spi-bcm63xx-hsspi.c
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+++ b/drivers/spi/spi-bcm63xx-hsspi.c
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@@ -19,6 +19,7 @@
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#include <linux/interrupt.h>
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#include <linux/spi/spi.h>
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#include <linux/mutex.h>
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+#include <linux/of.h>
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#define HSSPI_GLOBAL_CTRL_REG 0x0
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#define GLOBAL_CTRL_CS_POLARITY_SHIFT 0
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@@ -91,6 +92,7 @@
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#define HSSPI_MAX_SYNC_CLOCK 30000000
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+#define HSSPI_SPI_MAX_CS 8
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#define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */
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struct bcm63xx_hsspi {
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@@ -332,7 +334,7 @@ static int bcm63xx_hsspi_probe(struct pl
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struct device *dev = &pdev->dev;
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struct clk *clk;
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int irq, ret;
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- u32 reg, rate;
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+ u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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@@ -382,8 +384,17 @@ static int bcm63xx_hsspi_probe(struct pl
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mutex_init(&bs->bus_mutex);
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init_completion(&bs->done);
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- master->bus_num = HSSPI_BUS_NUM;
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- master->num_chipselect = 8;
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+ master->dev.of_node = dev->of_node;
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+ if (!dev->of_node)
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+ master->bus_num = HSSPI_BUS_NUM;
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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 > 8) {
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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 = HSSPI_SPI_MAX_CS;
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+ }
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+ master->num_chipselect = num_cs;
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master->setup = bcm63xx_hsspi_setup;
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master->transfer_one_message = bcm63xx_hsspi_transfer_one;
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master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
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@@ -469,10 +480,16 @@ static int bcm63xx_hsspi_resume(struct d
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static SIMPLE_DEV_PM_OPS(bcm63xx_hsspi_pm_ops, bcm63xx_hsspi_suspend,
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bcm63xx_hsspi_resume);
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+static const struct of_device_id bcm63xx_hsspi_of_match[] = {
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+ { .compatible = "brcm,bcm6328-hsspi", },
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+ { },
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+};
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+
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static struct platform_driver bcm63xx_hsspi_driver = {
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.driver = {
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.name = "bcm63xx-hsspi",
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.pm = &bcm63xx_hsspi_pm_ops,
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+ .of_match_table = bcm63xx_hsspi_of_match,
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},
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.probe = bcm63xx_hsspi_probe,
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.remove = bcm63xx_hsspi_remove,
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