Commit 04490b62 authored by Sean Anderson's avatar Sean Anderson Committed by Vinod Koul
Browse files

phy: zynqmp: Add debugfs support 



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: default avatarSean Anderson <sean.anderson@linux.dev>
Link: https://lore.kernel.org/r/20240628205540.3098010-6-sean.anderson@linux.dev


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent d79c6840

drivers/phy/xilinx/phy-zynqmp.c

+40 −0
Original line number Diff line number Diff line
@@ -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. */