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fpga: mgr: altera-ps-spi: enable usage on non-dt platforms 

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@denx.de>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anatolij Gustschin 2018-11-26 11:35:28 -06:00 committed by Greg Kroah-Hartman
parent 30522a951f
commit 1a195d87d2
1 changed files with 35 additions and 5 deletions
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40
drivers/fpga/altera-ps-spi.c
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@ -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);