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can: sja1000: of: add per-compatible init hook 

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.riegel@savoirfairelinux.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Damien Riegel 2016-01-12 17:31:18 -05:00 committed by Marc Kleine-Budde
parent 80c804bfc4
commit f49cbe6b79
1 changed files with 31 additions and 9 deletions
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40
drivers/net/can/sja1000/sja1000_platform.c
View File

@ -27,6 +27,7 @@
#include <linux/can/platform/sja1000.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include "sja1000.h"
@ -40,6 +41,11 @@ 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 +160,12 @@ 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", .data = NULL, },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, sp_of_table);
static int sp_probe(struct platform_device *pdev)
{
int err, irq = 0;
@ -163,6 +175,9 @@ 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 of_device_id *of_id;
const struct sja1000_of_data *of_data = NULL;
size_t priv_sz = 0;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata && !of) {
@ -191,7 +206,13 @@ static int sp_probe(struct platform_device *pdev)
if (!irq && !res_irq)
return -ENODEV;
dev = alloc_sja1000dev(0);
of_id = of_match_device(sp_of_table, &pdev->dev);
if (of_id && of_id->data) {
of_data = of_id->data;
priv_sz = of_data->priv_sz;
}
dev = alloc_sja1000dev(priv_sz);
if (!dev)
return -ENOMEM;
priv = netdev_priv(dev);
@ -208,10 +229,17 @@ static int sp_probe(struct platform_device *pdev)
dev->irq = irq;
priv->reg_base = addr;
if (of)
if (of) {
sp_populate_of(priv, of);
else
if (of_data && of_data->init) {
err = of_data->init(priv, of);
if (err)
goto exit_free;
}
} else {
sp_populate(priv, pdata, res_mem->flags);
}
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
@ -242,12 +270,6 @@ 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,