They get retrieved from the device-tree and exposed
as an attribute in sysfs
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
drivers/fsi/fsi-core.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 1ae5be31b4bf..3fe36673cb21 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;
@@ -723,6 +724,17 @@ 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;
@@ -786,6 +798,14 @@ 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,
@@ -820,6 +840,10 @@ 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",
--
2.17.1
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