linux-kernel - [PATCH v1 18/43] spi: ep93xx: add DT support for Cirrus EP93xx

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Message-Id: <20230601053546.9574-19-nikita.shubin@maquefel.me>
Date:   Thu,  1 Jun 2023 08:34:09 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>
Cc:     Nikita Shubin <nikita.shubin@...uefel.me>,
        Michael Peters <mpeters@...eddedTS.com>,
        Kris Bahnsen <kris@...eddedTS.com>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 18/43] 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

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
---

Notes:
    v0 -> v1:
    - dropped coma in ep93xx_spi_of_ids
    - renamed use_dma to "ep9301,use-dma"

 drivers/spi/spi-ep93xx.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 1615fd22f9a2..bd8049fe9c91 100644
--- 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, "ep9301,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" },
+	{ /* sentinel */ }
+};
+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,
-- 
2.37.4