[RFC PATCH] can: sja1000: of: add per-compatible init hook
From: Damien Riegel <hidden>
Date: 2015-12-19 17:11:45
Also in:
linux-can, lkml
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
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 <redacted> --- 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