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Subject[PATCH 3/3] phy: zynqmp: Add debugfs support
Date
Add support for printing some basic status information to debugfs. This
is helpful when debugging phy consumers to make sure they are configuring
the phy appropriately.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
---

drivers/phy/xilinx/phy-zynqmp.c | 54 +++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)

diff --git a/drivers/phy/xilinx/phy-zynqmp.c b/drivers/phy/xilinx/phy-zynqmp.c
index 08c88dcd7799..e2e86943e9f3 100644
--- a/drivers/phy/xilinx/phy-zynqmp.c
+++ b/drivers/phy/xilinx/phy-zynqmp.c
@@ -13,6 +13,7 @@
*/

#include <linux/clk.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kernel.h>
@@ -122,6 +123,15 @@
#define ICM_PROTOCOL_DP 0x4
#define ICM_PROTOCOL_SGMII 0x5

+static const char *const xpsgtr_icm_str[] = {
+ [ICM_PROTOCOL_PD] = "powered down",
+ [ICM_PROTOCOL_PCIE] = "PCIe",
+ [ICM_PROTOCOL_SATA] = "SATA",
+ [ICM_PROTOCOL_USB] = "USB",
+ [ICM_PROTOCOL_DP] = "DisplayPort",
+ [ICM_PROTOCOL_SGMII] = "SGMII",
+};
+
/* Test Mode common reset control parameters */
#define TM_CMN_RST 0x10018
#define TM_CMN_RST_EN 0x1
@@ -768,6 +778,48 @@ static struct phy *xpsgtr_xlate(struct device *dev,
return ERR_PTR(-EINVAL);
}

+/*
+ * DebugFS
+ */
+
+static int xpsgtr_status_read(struct seq_file *seq, void *data)
+{
+ struct xpsgtr_phy *gtr_phy = seq->private;
+ struct clk *clk;
+ u32 pll_status;
+
+ mutex_lock(&gtr_phy->phy->mutex);
+ pll_status = xpsgtr_read_phy(gtr_phy, L0_PLL_STATUS_READ_1);
+ clk = gtr_phy->dev->clk[gtr_phy->refclk];
+
+ seq_printf(seq, "Lane: %u\n", gtr_phy->lane);
+ seq_printf(seq, "Protocol: %s\n",
+ xpsgtr_icm_str[gtr_phy->protocol]);
+ seq_printf(seq, "Instance: %u\n", gtr_phy->instance);
+ seq_printf(seq, "Reference clock: %u (%pC)\n", gtr_phy->refclk, clk);
+ seq_printf(seq, "Reference rate: %lu\n", clk_get_rate(clk));
+ seq_printf(seq, "PLL locked: %s\n",
+ pll_status & PLL_STATUS_LOCKED ? "yes" : "no");
+
+ mutex_unlock(&gtr_phy->phy->mutex);
+ return 0;
+}
+
+static int xpsgtr_status_open(struct inode *inode, struct file *f)
+{
+ struct xpsgtr_phy *gtr_phy = inode->i_private;
+
+ return single_open(f, xpsgtr_status_read, gtr_phy);
+}
+
+static const struct file_operations xpsgtr_status_ops = {
+ .owner = THIS_MODULE,
+ .open = xpsgtr_status_open,
+ .release = single_release,
+ .read = seq_read,
+ .llseek = seq_lseek
+};
+
/*
* Power Management
*/
@@ -917,6 +969,8 @@ static int xpsgtr_probe(struct platform_device *pdev)

gtr_phy->phy = phy;
phy_set_drvdata(phy, gtr_phy);
+ debugfs_create_file("status", 0444, phy->debugfs, gtr_phy,
+ &xpsgtr_status_ops);
}

/* Register the PHY provider. */
--
2.35.1.1320.gc452695387.dirty

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