diff options
Diffstat (limited to 'drivers/fsi/fsi-master-aspeed.c')
| -rw-r--r-- | drivers/fsi/fsi-master-aspeed.c | 46 |
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; |