Driver probing fails on non-dt platforms since of_match_device()
always returns NULL here. Add spi ids with device names and
matching driver data as an index of a map array with data for
supported devices. Add this map array and a function for mapping
spi ids to driver data. This allows driver binding to dynamically
added PS-SPI devices (e.g. when added via spi_new_device() after
hot-plugging).
Signed-off-by: Anatolij Gustschin <agust@xxxxxxx>
---
Changes in v5:
- reword commit message
Changes in v4:
- reword commit message to describe code changes
- rework mapping code as suggested by Alan
- add comment about index with driver data map
Changes in v3:
- don't use pointers to device data struct in driver_data
Changes in v2:
- removed not necessary braces {}
- dropped not needed !id check
drivers/fpga/altera-ps-spi.c | 40 +++++++++++++++++++++++++++++++-----
1 file changed, 35 insertions(+), 5 deletions(-)
diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c
index 33aafda50af5..8c18beec6b57 100644
--- a/drivers/fpga/altera-ps-spi.c
+++ b/drivers/fpga/altera-ps-spi.c
@@ -75,6 +75,12 @@ static struct altera_ps_data a10_data = {
.t_st2ck_us = 10, /* min(t_ST2CK) */
};
+/* Array index is enum altera_ps_devtype */
+static const struct altera_ps_data *altera_ps_data_map[] = {
+ &c5_data,
+ &a10_data,
+};
+
static const struct of_device_id of_ef_match[] = {
{ .compatible = "altr,fpga-passive-serial", .data = &c5_data },
{ .compatible = "altr,fpga-arria10-passive-serial", .data = &a10_data },
@@ -234,6 +240,22 @@ static const struct fpga_manager_ops altera_ps_ops = {
.write_complete = altera_ps_write_complete,
};
+static const struct altera_ps_data *id_to_data(const struct spi_device_id *id)
+{
+ kernel_ulong_t devtype = id->driver_data;
+ const struct altera_ps_data *data;
+
+ /* someone added a altera_ps_devtype without adding to the map array */
+ if (devtype >= ARRAY_SIZE(altera_ps_data_map))
+ return NULL;
+
+ data = altera_ps_data_map[devtype];
+ if (!data || data->devtype != devtype)
+ return NULL;
+
+ return data;
+}
+
static int altera_ps_probe(struct spi_device *spi)
{
struct altera_ps_conf *conf;
@@ -244,11 +266,17 @@ static int altera_ps_probe(struct spi_device *spi)
if (!conf)
return -ENOMEM;
- of_id = of_match_device(of_ef_match, &spi->dev);
- if (!of_id)
- return -ENODEV;
+ if (spi->dev.of_node) {
+ of_id = of_match_device(of_ef_match, &spi->dev);
+ if (!of_id)
+ return -ENODEV;
+ conf->data = of_id->data;
+ } else {
+ conf->data = id_to_data(spi_get_device_id(spi));
+ if (!conf->data)
+ return -ENODEV;
+ }
- conf->data = of_id->data;
conf->spi = spi;
conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);
if (IS_ERR(conf->config)) {
@@ -294,7 +322,9 @@ static int altera_ps_remove(struct spi_device *spi)
}
static const struct spi_device_id altera_ps_spi_ids[] = {
- {"cyclone-ps-spi", 0},
+ { "cyclone-ps-spi", CYCLONE5 },
+ { "fpga-passive-serial", CYCLONE5 },
+ { "fpga-arria10-passive-serial", ARRIA10 },
{}
};
MODULE_DEVICE_TABLE(spi, altera_ps_spi_ids);
--
2.17.1
