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path: root/drivers/fsi/fsi-master-aspeed.c
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Diffstat (limited to 'drivers/fsi/fsi-master-aspeed.c')
-rw-r--r--drivers/fsi/fsi-master-aspeed.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 2b8ca72baeb5..c282de76e6e7 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -13,6 +13,7 @@
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/iopoll.h>
+#include <linux/gpio/consumer.h>
#include "fsi-master.h"
@@ -417,6 +418,45 @@ static int aspeed_master_init(struct fsi_master_aspeed *aspeed)
return 0;
}
+static int tacoma_cabled_fsi_fixup(struct device *dev)
+{
+ struct gpio_desc *routing_gpio, *mux_gpio;
+ int gpio;
+
+ /*
+ * The routing GPIO is a jumper indicating we should mux for the
+ * externally connected FSI cable.
+ */
+ routing_gpio = devm_gpiod_get_optional(dev, "fsi-routing",
+ GPIOD_IN | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
+ if (IS_ERR(routing_gpio))
+ return PTR_ERR(routing_gpio);
+ if (!routing_gpio)
+ return 0;
+
+ mux_gpio = devm_gpiod_get_optional(dev, "fsi-mux", GPIOD_ASIS);
+ if (IS_ERR(mux_gpio))
+ return PTR_ERR(mux_gpio);
+ if (!mux_gpio)
+ return 0;
+
+ gpio = gpiod_get_value(routing_gpio);
+ if (gpio < 0)
+ return gpio;
+
+ /* If the routing GPIO is high we should set the mux to low. */
+ if (gpio) {
+ gpiod_direction_output(mux_gpio, 0);
+ dev_info(dev, "FSI configured for external cable\n");
+ } else {
+ gpiod_direction_output(mux_gpio, 1);
+ }
+
+ devm_gpiod_put(dev, routing_gpio);
+
+ return 0;
+}
+
static int fsi_master_aspeed_probe(struct platform_device *pdev)
{
struct fsi_master_aspeed *aspeed;
@@ -424,6 +464,12 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
int rc, links, reg;
__be32 raw;
+ rc = tacoma_cabled_fsi_fixup(&pdev->dev);
+ if (rc) {
+ dev_err(&pdev->dev, "Tacoma FSI cable fixup failed\n");
+ return rc;
+ }
+
aspeed = devm_kzalloc(&pdev->dev, sizeof(*aspeed), GFP_KERNEL);
if (!aspeed)
return -ENOMEM;