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authorAntoine Tenart <antoine.tenart@free-electrons.com>2015-05-16 00:41:25 +0200
committerSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>2015-05-18 17:52:36 +0200
commitaed6f3cadc860ddeec598ed82041c1f3773071b1 (patch)
treec2fc81b12b390ae6b4d7b09e667493a30e659188 /drivers/reset
parentffcc33a5d496d03a0ccd7542f9b65a7aec67072d (diff)
downloadop-kernel-dev-aed6f3cadc860ddeec598ed82041c1f3773071b1.zip
op-kernel-dev-aed6f3cadc860ddeec598ed82041c1f3773071b1.tar.gz
reset: berlin: convert to a platform driver
The Berlin reset controller was introduced without being a platform driver because of a needed DT rework: the node describing the reset controller also describes the pinctrl and clk controllers... Prepare conversion by adding a platform driver probe to a new compatible "marvell,berlin2-reset" with syscon regmap. Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/reset-berlin.c53
1 files changed, 52 insertions, 1 deletions
diff --git a/drivers/reset/reset-berlin.c b/drivers/reset/reset-berlin.c
index f8b48a1..d43bc16 100644
--- a/drivers/reset/reset-berlin.c
+++ b/drivers/reset/reset-berlin.c
@@ -11,10 +11,12 @@
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/types.h>
@@ -27,6 +29,7 @@
struct berlin_reset_priv {
void __iomem *base;
unsigned int size;
+ struct regmap *regmap;
struct reset_controller_dev rcdev;
};
@@ -37,7 +40,10 @@ static int berlin_reset_reset(struct reset_controller_dev *rcdev,
int offset = id >> 8;
int mask = BIT(id & 0x1f);
- writel(mask, priv->base + offset);
+ if (priv->regmap)
+ regmap_write(priv->regmap, offset, mask);
+ else
+ writel(mask, priv->base + offset);
/* let the reset be effective */
udelay(10);
@@ -70,6 +76,51 @@ static int berlin_reset_xlate(struct reset_controller_dev *rcdev,
return (offset << 8) | bit;
}
+static int berlin2_reset_probe(struct platform_device *pdev)
+{
+ struct device_node *parent_np = of_get_parent(pdev->dev.of_node);
+ struct berlin_reset_priv *priv;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = syscon_node_to_regmap(parent_np);
+ of_node_put(parent_np);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ priv->rcdev.owner = THIS_MODULE;
+ priv->rcdev.ops = &berlin_reset_ops;
+ priv->rcdev.of_node = pdev->dev.of_node;
+ priv->rcdev.of_reset_n_cells = 2;
+ priv->rcdev.of_xlate = berlin_reset_xlate;
+
+ reset_controller_register(&priv->rcdev);
+
+ return 0;
+}
+
+static const struct of_device_id berlin_reset_dt_match[] = {
+ { .compatible = "marvell,berlin2-reset" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, berlin_reset_dt_match);
+
+static struct platform_driver berlin_reset_driver = {
+ .probe = berlin2_reset_probe,
+ .driver = {
+ .name = "berlin2-reset",
+ .of_match_table = berlin_reset_dt_match,
+ },
+};
+module_platform_driver(berlin_reset_driver);
+
+MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
+MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>");
+MODULE_DESCRIPTION("Marvell Berlin reset driver");
+MODULE_LICENSE("GPL");
+
static int __berlin_reset_init(struct device_node *np)
{
struct berlin_reset_priv *priv;
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