serial: sh-sci: Add OF support

Extend the driver to with support for SCIx device tree bindings. A
minimal set of features is supported, additional properties can be added
later should the need to describe more device features arise.

Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 98 insertions, 3 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index c4111162ec5e..be33d2b0613b 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -39,6 +39,7 @@
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/notifier.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/scatterlist.h>
@@ -2415,6 +2416,83 @@ static int sci_remove(struct platform_device *dev)
         return 0;
 }
 
+struct sci_port_info {
+        unsigned int type;
+        unsigned int regtype;
+};
+
+static const struct of_device_id of_sci_match[] = {
+        {
+                .compatible = "renesas,scif",
+                .data = (void *)&(const struct sci_port_info) {
+                        .type = PORT_SCIF,
+                        .regtype = SCIx_SH4_SCIF_REGTYPE,
+                },
+        }, {
+                .compatible = "renesas,scifa",
+                .data = (void *)&(const struct sci_port_info) {
+                        .type = PORT_SCIFA,
+                        .regtype = SCIx_SCIFA_REGTYPE,
+                },
+        }, {
+                .compatible = "renesas,scifb",
+                .data = (void *)&(const struct sci_port_info) {
+                        .type = PORT_SCIFB,
+                        .regtype = SCIx_SCIFB_REGTYPE,
+                },
+        }, {
+                .compatible = "renesas,hscif",
+                .data = (void *)&(const struct sci_port_info) {
+                        .type = PORT_HSCIF,
+                        .regtype = SCIx_HSCIF_REGTYPE,
+                },
+        }, {
+                /* Terminator */
+        },
+};
+MODULE_DEVICE_TABLE(of, of_sci_match);
+
+static struct plat_sci_port *
+sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id)
+{
+        struct device_node *np = pdev->dev.of_node;
+        const struct of_device_id *match;
+        const struct sci_port_info *info;
+        struct plat_sci_port *p;
+        int id;
+
+        if (!IS_ENABLED(CONFIG_OF) || !np)
+                return NULL;
+
+        match = of_match_node(of_sci_match, pdev->dev.of_node);
+        if (!match)
+                return NULL;
+
+        info = match->data;
+
+        p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL);
+        if (!p) {
+                dev_err(&pdev->dev, "failed to allocate DT config data\n");
+                return NULL;
+        }
+
+        /* Get the line number for the aliases node. */
+        id = of_alias_get_id(np, "serial");
+        if (id < 0) {
+                dev_err(&pdev->dev, "failed to get alias id (%d)\n", id);
+                return NULL;
+        }
+
+        *dev_id = id;
+
+        p->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
+        p->type = info->type;
+        p->regtype = info->regtype;
+        p->scscr = SCSCR_RE | SCSCR_TE;
+
+        return p;
+}
+
 static int sci_probe_single(struct platform_device *dev,
                                       unsigned int index,
                                       struct plat_sci_port *p,
@@ -2447,8 +2525,9 @@ static int sci_probe_single(struct platform_device *dev,
 
 static int sci_probe(struct platform_device *dev)
 {
-        struct plat_sci_port *p = dev_get_platdata(&dev->dev);
-        struct sci_port *sp = &sci_ports[dev->id];
+        struct plat_sci_port *p;
+        struct sci_port *sp;
+        unsigned int dev_id;
         int ret;
 
         /*
@@ -2459,9 +2538,24 @@ static int sci_probe(struct platform_device *dev)
         if (is_early_platform_device(dev))
                 return sci_probe_earlyprintk(dev);
 
+        if (dev->dev.of_node) {
+                p = sci_parse_dt(dev, &dev_id);
+                if (p == NULL)
+                        return -EINVAL;
+        } else {
+                p = dev->dev.platform_data;
+                if (p == NULL) {
+                        dev_err(&dev->dev, "no platform data supplied\n");
+                        return -EINVAL;
+                }
+
+                dev_id = dev->id;
+        }
+
+        sp = &sci_ports[dev_id];
         platform_set_drvdata(dev, sp);
 
-        ret = sci_probe_single(dev, dev->id, p, sp);
+        ret = sci_probe_single(dev, dev_id, p, sp);
         if (ret)
                 return ret;
 
@@ -2513,6 +2607,7 @@ static struct platform_driver sci_driver = {
                 .name   = "sh-sci",
                 .owner  = THIS_MODULE,
                 .pm     = &sci_dev_pm_ops,
+                .of_match_table = of_match_ptr(of_sci_match),
         },
 };