This commit adds the capability to allocate and init private data
embedded in the sja1000_priv structure on a per-compatible basis. The
device node is passed as a parameter of the init callback to allow
parsing of custom device tree properties.
Signed-off-by: Damien Riegel <damien.rie...@savoirfairelinux.com>
---
Hi Marc,
I am sending this patch as RFC as I have only compile-tested it, but I
would like your feedback on it.
The idea of this patch is to ease integration of the Technologic Systems
version of this IP in the most generic way, providing a facility that
could be used by others.
Thanks,
Damien
drivers/net/can/sja1000/sja1000_platform.c | 44 +++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 7 deletions(-)
diff --git a/drivers/net/can/sja1000/sja1000_platform.c
b/drivers/net/can/sja1000/sja1000_platform.c
index 0552ed4..33581b0 100644
--- a/drivers/net/can/sja1000/sja1000_platform.c
+++ b/drivers/net/can/sja1000/sja1000_platform.c
@@ -40,6 +40,11 @@ MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the
platform bus");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_LICENSE("GPL v2");
+struct sja1000_of_data {
+ size_t priv_sz;
+ int (*init)(struct sja1000_priv *priv, struct device_node *of);
+};
+
static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
{
return ioread8(priv->reg_base + reg);
@@ -154,6 +159,26 @@ static void sp_populate_of(struct sja1000_priv *priv,
struct device_node *of)
priv->cdr |= CDR_CBP; /* default */
}
+static const struct of_device_id sp_of_table[] = {
+ {.compatible = "nxp,sja1000"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, sp_of_table);
+
+static const struct sja1000_of_data *sp_get_of_data(struct device_node *of)
+{
+ const struct of_device_id *id;
+
+ if (!of)
+ return NULL;
+
+ id = of_match_node(sp_of_table, of);
+ if (!id)
+ return NULL;
+
+ return id->data;
+}
+
static int sp_probe(struct platform_device *pdev)
{
int err, irq = 0;
@@ -163,6 +188,8 @@ static int sp_probe(struct platform_device *pdev)
struct resource *res_mem, *res_irq = NULL;
struct sja1000_platform_data *pdata;
struct device_node *of = pdev->dev.of_node;
+ const struct sja1000_of_data *of_data = sp_get_of_data(of);
+ size_t priv_sz = 0;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata && !of) {
@@ -191,7 +218,10 @@ static int sp_probe(struct platform_device *pdev)
if (!irq && !res_irq)
return -ENODEV;
- dev = alloc_sja1000dev(0);
+ if (of_data)
+ priv_sz = of_data->priv_sz;
+
+ dev = alloc_sja1000dev(priv_sz);
if (!dev)
return -ENOMEM;
priv = netdev_priv(dev);
@@ -213,6 +243,12 @@ static int sp_probe(struct platform_device *pdev)
else
sp_populate(priv, pdata, res_mem->flags);
+ if (of_data && of_data->init) {
+ err = of_data->init(priv, of);
+ if (err)
+ goto exit_free;
+ }
+
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
@@ -242,12 +278,6 @@ static int sp_remove(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id sp_of_table[] = {
- {.compatible = "nxp,sja1000"},
- {},
-};
-MODULE_DEVICE_TABLE(of, sp_of_table);
-
static struct platform_driver sp_driver = {
.probe = sp_probe,
.remove = sp_remove,
--
2.5.0
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