summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--Documentation/ABI/testing/sysfs-bus-fsi8
-rw-r--r--drivers/fsi/fsi-master-aspeed.c43
2 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-fsi b/Documentation/ABI/testing/sysfs-bus-fsi
index 320697bdf41d..d148214181a1 100644
--- a/Documentation/ABI/testing/sysfs-bus-fsi
+++ b/Documentation/ABI/testing/sysfs-bus-fsi
@@ -36,3 +36,11 @@ Contact: linux-fsi@lists.ozlabs.org
Description:
Provides a means of reading/writing a 32 bit value from/to a
specified FSI bus address.
+
+What: /sys/bus/platform/devices/../cfam_reset
+Date: Sept 2020
+KernelVersion: 5.10
+Contact: linux-fsi@lists.ozlabs.org
+Description:
+ Provides a means of resetting the cfam that is attached to the
+ FSI device.
diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 2531e826ba8b..c006ec008a1a 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -22,6 +22,7 @@ struct fsi_master_aspeed {
struct device *dev;
void __iomem *base;
struct clk *clk;
+ struct gpio_desc *cfam_reset_gpio;
};
#define to_fsi_master_aspeed(m) \
@@ -425,6 +426,43 @@ static int aspeed_master_init(struct fsi_master_aspeed *aspeed)
return 0;
}
+static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fsi_master_aspeed *aspeed = dev_get_drvdata(dev);
+
+ gpiod_set_value(aspeed->cfam_reset_gpio, 1);
+ usleep_range(900, 1000);
+ gpiod_set_value(aspeed->cfam_reset_gpio, 0);
+
+ return count;
+}
+
+static DEVICE_ATTR(cfam_reset, 0200, NULL, cfam_reset_store);
+
+static int setup_cfam_reset(struct fsi_master_aspeed *aspeed)
+{
+ struct device *dev = aspeed->dev;
+ struct gpio_desc *gpio;
+ int rc;
+
+ gpio = devm_gpiod_get_optional(dev, "cfam-reset", GPIOD_OUT_LOW);
+ if (IS_ERR(gpio))
+ return PTR_ERR(gpio);
+ if (!gpio)
+ return 0;
+
+ aspeed->cfam_reset_gpio = gpio;
+
+ rc = device_create_file(dev, &dev_attr_cfam_reset);
+ if (rc) {
+ devm_gpiod_put(dev, gpio);
+ return rc;
+ }
+
+ return 0;
+}
+
static int tacoma_cabled_fsi_fixup(struct device *dev)
{
struct gpio_desc *routing_gpio, *mux_gpio;
@@ -507,6 +545,11 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
return rc;
}
+ rc = setup_cfam_reset(aspeed);
+ if (rc) {
+ dev_err(&pdev->dev, "CFAM reset GPIO setup failed\n");
+ }
+
writel(0x1, aspeed->base + OPB_CLK_SYNC);
writel(OPB1_XFER_ACK_EN | OPB0_XFER_ACK_EN,
aspeed->base + OPB_IRQ_MASK);