spi: ep93xx: add DT support for Cirrus EP93xx

- find register range from the device tree
- provide clock access via of
- use_dma as a DT node

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 1615fd22f9a21c81678f1452b0cbac782c14e711..9d99e4ddb29b4ec9e85a2e47c6d2a58d9bef33bd 100644 (file)
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -22,6 +22,7 @@
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/scatterlist.h>
@@ -644,6 +645,25 @@ static void ep93xx_spi_release_dma(struct ep93xx_spi *espi)
                free_page((unsigned long)espi->zeropage);
 }
 
+#ifdef CONFIG_OF
+static struct ep93xx_spi_info dt_spi_info;
+
+static struct ep93xx_spi_info *ep93xx_spi_get_platdata(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+
+       if (np && of_property_read_bool(np, "use_dma"))
+               dt_spi_info.use_dma = 1;
+
+       return &dt_spi_info;
+}
+#else
+static struct ep93xx_spi_info *ep93xx_spi_get_platdata(struct platform_device *pdev)
+{
+       return dev_get_platdata(&pdev->dev);
+}
+#endif
+
 static int ep93xx_spi_probe(struct platform_device *pdev)
 {
        struct spi_master *master;
@@ -653,7 +673,7 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
        int irq;
        int error;
 
-       info = dev_get_platdata(&pdev->dev);
+       info = ep93xx_spi_get_platdata(pdev);
        if (!info) {
                dev_err(&pdev->dev, "missing platform data\n");
                return -EINVAL;
@@ -726,6 +746,8 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
        /* make sure that the hardware is disabled */
        writel(0, espi->mmio + SSPCR1);
 
+       master->dev.of_node = pdev->dev.of_node;
+
        error = devm_spi_register_master(&pdev->dev, master);
        if (error) {
                dev_err(&pdev->dev, "failed to register SPI master\n");
@@ -753,9 +775,16 @@ static void ep93xx_spi_remove(struct platform_device *pdev)
        ep93xx_spi_release_dma(espi);
 }
 
+static const struct of_device_id ep93xx_spi_of_ids[] = {
+       { .compatible = "cirrus,ep9301-spi" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, ep93xx_spi_of_ids);
+
 static struct platform_driver ep93xx_spi_driver = {
        .driver         = {
                .name   = "ep93xx-spi",
+               .of_match_table = ep93xx_spi_of_ids,
        },
        .probe          = ep93xx_spi_probe,
        .remove_new     = ep93xx_spi_remove,