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phy: zynqmp: Add debugfs support

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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>
Link: https://lore.kernel.org/r/20240628205540.3098010-6-sean.anderson@linux.dev
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Sean Anderson 2024-06-28 16:55:40 -04:00 committed by Vinod Koul
parent d79c684091
commit 04490b621a
1 changed files with 40 additions and 0 deletions
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40
drivers/phy/xilinx/phy-zynqmp.c
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@ -13,6 +13,7 @@
*/
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kernel.h>
@ -123,6 +124,15 @@
#define ICM_PROTOCOL_DP 0x4
#define ICM_PROTOCOL_SGMII 0x5
static const char *const xpsgtr_icm_str[] = {
[ICM_PROTOCOL_PD] = "none",
[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
@ -787,6 +797,34 @@ 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 device *dev = seq->private;
struct xpsgtr_phy *gtr_phy = dev_get_drvdata(dev);
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;
}
/*
* Power Management
*/
@ -936,6 +974,8 @@ static int xpsgtr_probe(struct platform_device *pdev)
gtr_phy->phy = phy;
phy_set_drvdata(phy, gtr_phy);
debugfs_create_devm_seqfile(&phy->dev, "status", phy->debugfs,
xpsgtr_status_read);
}
/* Register the PHY provider. */