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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-06-20 15:16:31 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-07-23 16:27:32 +1000 |
| commit | 0a213777d1dd879092225a7aa847b6e9b3a1c267 (patch) | |
| tree | c531f20cdba28dcd71b12c829d843c1f11e197af /drivers/fsi | |
| parent | e13c542d5227481836e91f7b3a025e2c9092bc04 (diff) | |
| download | linux-0a213777d1dd879092225a7aa847b6e9b3a1c267.tar.gz linux-0a213777d1dd879092225a7aa847b6e9b3a1c267.tar.bz2 linux-0a213777d1dd879092225a7aa847b6e9b3a1c267.zip | |
fsi: Add support for device-tree provided chip IDs
They get retrieved from the device-tree and exposed
as an attribute in sysfs
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/fsi')
| -rw-r--r-- | drivers/fsi/fsi-core.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index e9f8813b75e6..eab6c5c4990e 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -80,6 +80,7 @@ struct fsi_slave { struct fsi_master *master; int id; int link; + int chip_id; uint32_t size; /* size of slave address space */ u8 t_send_delay; u8 t_echo_delay; @@ -717,6 +718,17 @@ static ssize_t slave_send_echo_store(struct device *dev, static DEVICE_ATTR(send_echo_delays, 0600, slave_send_echo_show, slave_send_echo_store); +static ssize_t chip_id_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct fsi_slave *slave = to_fsi_slave(dev); + + return sprintf(buf, "%d\n", slave->chip_id); +} + +static DEVICE_ATTR_RO(chip_id); + static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { uint32_t chip_id; @@ -780,6 +792,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) slave->t_send_delay = 16; slave->t_echo_delay = 16; + /* Get chip ID if any */ + slave->chip_id = -1; + if (slave->dev.of_node) { + uint32_t prop; + if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) + slave->chip_id = prop; + + } rc = fsi_slave_set_smode(slave); if (rc) { dev_warn(&master->dev, @@ -814,6 +834,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) if (rc) dev_warn(&slave->dev, "failed to create delay attr: %d\n", rc); + rc = device_create_file(&slave->dev, &dev_attr_chip_id); + if (rc) + dev_warn(&slave->dev, "failed to create chip id: %d\n", rc); + rc = fsi_slave_scan(slave); if (rc) dev_dbg(&master->dev, "failed during slave scan with: %d\n", |