[PATCH v7 1/3] phy: mediatek: remove temporary variable @mask_

[PATCH v7 1/3] phy: mediatek: remove temporary variable @mask_

[Chunfeng Yun]

Remove the temporary @mask_, this may cause build warning when use clang
compiler for powerpc, but can't reproduce it when compile for arm64.
the build warning is caused by:

"warning: result of comparison of constant 18446744073709551615 with
expression of type (aka 'unsigned long') is always false
[-Wtautological-constant-out-of-range-compare]"

More information provided in below lore link.

After removing @mask_, there is a "CHECK:MACRO_ARG_REUSE" when run
checkpatch.pl, but due to @mask is constant, no reuse problem will happen.

Link: https://lore.kernel.org/lkml/202212160357.jJuesD8n-lkp@intel.com/t/
Fixes: 84513eccd678 ("phy: mediatek: fix build warning of FIELD_PREP()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v7: modify title suggested by Vinod,
    modify commit message and add link tag suggested by Nick

v6: modify the title
v5: no changes
v4 new patch, I'm not sure it can fix build warning, due to I don't cross compile
    it for powerpc using clang in office.
---
 drivers/phy/mediatek/phy-mtk-io.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-io.h b/drivers/phy/mediatek/phy-mtk-io.h
index d20ad5e5be81..58f06db822cb 100644
--- a/drivers/phy/mediatek/phy-mtk-io.h
+++ b/drivers/phy/mediatek/phy-mtk-io.h
@@ -39,8 +39,8 @@ static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
 /* field @mask shall be constant and continuous */
 #define mtk_phy_update_field(reg, mask, val) \
 ({ \
-	typeof(mask) mask_ = (mask);	\
-	mtk_phy_update_bits(reg, mask_, FIELD_PREP(mask_, val)); \
+	BUILD_BUG_ON_MSG(!__builtin_constant_p(mask), "mask is not constant"); \
+	mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val)); \
 })
 
 #endif
-- 
2.18.0

[PATCH v7 2/3] phy: core: add debugfs root

[Chunfeng Yun]

Add a debugfs root for phy class, then phy drivers can add debugfs files
under this folder.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v7: no changes
---
 drivers/phy/phy-core.c  | 6 ++++++
 include/linux/phy/phy.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index d93ddf1262c5..2f9f69190519 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -11,6 +11,7 @@
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
@@ -1204,6 +1205,9 @@ void devm_of_phy_provider_unregister(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
 
+struct dentry *phy_debug_root;
+EXPORT_SYMBOL_GPL(phy_debug_root);
+
 /**
  * phy_release() - release the phy
  * @dev: the dev member within phy
@@ -1233,6 +1237,8 @@ static int __init phy_core_init(void)
 
 	phy_class->dev_release = phy_release;
 
+	phy_debug_root = debugfs_create_dir("phy", NULL);
+
 	return 0;
 }
 device_initcall(phy_core_init);
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index b1413757fcc3..c398749d49b9 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -205,6 +205,8 @@ struct phy_lookup {
 #define devm_of_phy_provider_register_full(dev, children, xlate) \
 	__devm_of_phy_provider_register(dev, children, THIS_MODULE, xlate)
 
+extern struct dentry *phy_debug_root;
+
 static inline void phy_set_drvdata(struct phy *phy, void *data)
 {
 	dev_set_drvdata(&phy->dev, data);
-- 
2.18.0

Re: [PATCH v7 2/3] phy: core: add debugfs root

[AngeloGioacchino Del Regno]

Il 18/01/23 09:43, Chunfeng Yun ha scritto:
> Add a debugfs root for phy class, then phy drivers can add debugfs files
> under this folder.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Re: [PATCH v7 2/3] phy: core: add debugfs root

[Vinod Koul]

On 18-01-23, 16:43, Chunfeng Yun wrote:
> Add a debugfs root for phy class, then phy drivers can add debugfs files
> under this folder.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v2~v7: no changes
> ---
>  drivers/phy/phy-core.c  | 6 ++++++
>  include/linux/phy/phy.h | 2 ++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index d93ddf1262c5..2f9f69190519 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -11,6 +11,7 @@
>  #include <linux/export.h>
>  #include <linux/module.h>
>  #include <linux/err.h>
> +#include <linux/debugfs.h>
>  #include <linux/device.h>
>  #include <linux/slab.h>
>  #include <linux/of.h>
> @@ -1204,6 +1205,9 @@ void devm_of_phy_provider_unregister(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
>  
> +struct dentry *phy_debug_root;
> +EXPORT_SYMBOL_GPL(phy_debug_root);

Please make this a member of struct phy, that way all phy drivers have access
to this and we wont need to export this!

> +
>  /**
>   * phy_release() - release the phy
>   * @dev: the dev member within phy
> @@ -1233,6 +1237,8 @@ static int __init phy_core_init(void)
>  
>  	phy_class->dev_release = phy_release;
>  
> +	phy_debug_root = debugfs_create_dir("phy", NULL);
> +
>  	return 0;
>  }
>  device_initcall(phy_core_init);
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index b1413757fcc3..c398749d49b9 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -205,6 +205,8 @@ struct phy_lookup {
>  #define devm_of_phy_provider_register_full(dev, children, xlate) \
>  	__devm_of_phy_provider_register(dev, children, THIS_MODULE, xlate)
>  
> +extern struct dentry *phy_debug_root;
> +
>  static inline void phy_set_drvdata(struct phy *phy, void *data)
>  {
>  	dev_set_drvdata(&phy->dev, data);
> -- 
> 2.18.0

-- 
~Vinod

Re: [PATCH v7 2/3] phy: core: add debugfs root

[Chunfeng Yun (云春峰)]

On Thu, 2023-02-02 at 18:41 +0530, Vinod Koul wrote:
> On 18-01-23, 16:43, Chunfeng Yun wrote:
> > Add a debugfs root for phy class, then phy drivers can add debugfs
> > files
> > under this folder.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > ---
> > v2~v7: no changes
> > ---
> >  drivers/phy/phy-core.c  | 6 ++++++
> >  include/linux/phy/phy.h | 2 ++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> > index d93ddf1262c5..2f9f69190519 100644
> > --- a/drivers/phy/phy-core.c
> > +++ b/drivers/phy/phy-core.c
> > @@ -11,6 +11,7 @@
> >  #include <linux/export.h>
> >  #include <linux/module.h>
> >  #include <linux/err.h>
> > +#include <linux/debugfs.h>
> >  #include <linux/device.h>
> >  #include <linux/slab.h>
> >  #include <linux/of.h>
> > @@ -1204,6 +1205,9 @@ void devm_of_phy_provider_unregister(struct
> > device *dev,
> >  }
> >  EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
> >  
> > +struct dentry *phy_debug_root;
> > +EXPORT_SYMBOL_GPL(phy_debug_root);
> 
> Please make this a member of struct phy, that way all phy drivers
> have access
> to this and we wont need to export this!
Ok, I'll modify it, thanks

> 
> > +
> >  /**
> >   * phy_release() - release the phy
> >   * @dev: the dev member within phy
> > @@ -1233,6 +1237,8 @@ static int __init phy_core_init(void)
> >  
> >  	phy_class->dev_release = phy_release;
> >  
> > +	phy_debug_root = debugfs_create_dir("phy", NULL);
> > +
> >  	return 0;
> >  }
> >  device_initcall(phy_core_init);
> > diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> > index b1413757fcc3..c398749d49b9 100644
> > --- a/include/linux/phy/phy.h
> > +++ b/include/linux/phy/phy.h
> > @@ -205,6 +205,8 @@ struct phy_lookup {
> >  #define devm_of_phy_provider_register_full(dev, children, xlate) \
> >  	__devm_of_phy_provider_register(dev, children, THIS_MODULE,
> > xlate)
> >  
> > +extern struct dentry *phy_debug_root;
> > +
> >  static inline void phy_set_drvdata(struct phy *phy, void *data)
> >  {
> >  	dev_set_drvdata(&phy->dev, data);
> > -- 
> > 2.18.0
> 
> 

[PATCH v7 3/3] phy: mediatek: tphy: add debugfs files

[Chunfeng Yun]

These debugfs files are mainly used to make eye diagram test easier,
especially helpful to do HQA test for a new IC without efuse enabled.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v6~v7: no changes

v5: using common debugfs config CONFIG_DEBUG_FS

v4: fix build warning of sometimes uninitialized variable

v3: fix typo of "debugfs" suggested by AngeloGioacchino

v2: add CONFIG_PHY_MTK_TPHY_DEBUGFS suggested by AngeloGioacchino
---
 drivers/phy/mediatek/phy-mtk-tphy.c | 405 +++++++++++++++++++++++++++-
 1 file changed, 404 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index e906a82791bd..923e5ee119f3 100644
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -7,6 +7,7 @@
 
 #include <dt-bindings/phy/phy.h>
 #include <linux/clk.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/iopoll.h>
 #include <linux/mfd/syscon.h>
@@ -264,6 +265,8 @@
 
 #define TPHY_CLKS_CNT	2
 
+#define USER_BUF_LEN(count) min_t(size_t, 8, (count))
+
 enum mtk_phy_version {
 	MTK_PHY_V1 = 1,
 	MTK_PHY_V2,
@@ -310,6 +313,7 @@ struct mtk_phy_instance {
 	struct clk_bulk_data clks[TPHY_CLKS_CNT];
 	u32 index;
 	u32 type;
+	struct dentry *dbgfs;
 	struct regmap *type_sw;
 	u32 type_sw_reg;
 	u32 type_sw_index;
@@ -332,10 +336,391 @@ struct mtk_tphy {
 	const struct mtk_phy_pdata *pdata;
 	struct mtk_phy_instance **phys;
 	int nphys;
+	struct dentry *dbgfs_root;
 	int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
 	int src_coef; /* coefficient for slew rate calibrate */
 };
 
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+
+enum u2_phy_params {
+	U2P_EYE_VRT = 0,
+	U2P_EYE_TERM,
+	U2P_EFUSE_EN,
+	U2P_EFUSE_INTR,
+	U2P_DISCTH,
+	U2P_PRE_EMPHASIS,
+};
+
+enum u3_phy_params {
+	U3P_EFUSE_EN = 0,
+	U3P_EFUSE_INTR,
+	U3P_EFUSE_TX_IMP,
+	U3P_EFUSE_RX_IMP,
+};
+
+static const char *const u2_phy_files[] = {
+	[U2P_EYE_VRT] = "vrt",
+	[U2P_EYE_TERM] = "term",
+	[U2P_EFUSE_EN] = "efuse",
+	[U2P_EFUSE_INTR] = "intr",
+	[U2P_DISCTH] = "discth",
+	[U2P_PRE_EMPHASIS] = "preemph",
+};
+
+static const char *const u3_phy_files[] = {
+	[U3P_EFUSE_EN] = "efuse",
+	[U3P_EFUSE_INTR] = "intr",
+	[U3P_EFUSE_TX_IMP] = "tx-imp",
+	[U3P_EFUSE_RX_IMP] = "rx-imp",
+};
+
+static int u2_phy_params_show(struct seq_file *sf, void *unused)
+{
+	struct mtk_phy_instance *inst = sf->private;
+	const char *fname = file_dentry(sf->file)->d_iname;
+	struct u2phy_banks *u2_banks = &inst->u2_banks;
+	void __iomem *com = u2_banks->com;
+	u32 max = 0;
+	u32 tmp = 0;
+	u32 val = 0;
+	int ret;
+
+	ret = match_string(u2_phy_files, ARRAY_SIZE(u2_phy_files), fname);
+	if (ret < 0)
+		return ret;
+
+	switch (ret) {
+	case U2P_EYE_VRT:
+		tmp = readl(com + U3P_USBPHYACR1);
+		val = FIELD_GET(PA1_RG_VRT_SEL, tmp);
+		max = FIELD_MAX(PA1_RG_VRT_SEL);
+		break;
+
+	case U2P_EYE_TERM:
+		tmp = readl(com + U3P_USBPHYACR1);
+		val = FIELD_GET(PA1_RG_TERM_SEL, tmp);
+		max = FIELD_MAX(PA1_RG_TERM_SEL);
+		break;
+
+	case U2P_EFUSE_EN:
+		if (u2_banks->misc) {
+			tmp = readl(u2_banks->misc + U3P_MISC_REG1);
+			max = 1;
+		}
+
+		val = !!(tmp & MR1_EFUSE_AUTO_LOAD_DIS);
+		break;
+
+	case U2P_EFUSE_INTR:
+		tmp = readl(com + U3P_USBPHYACR1);
+		val = FIELD_GET(PA1_RG_INTR_CAL, tmp);
+		max = FIELD_MAX(PA1_RG_INTR_CAL);
+		break;
+
+	case U2P_DISCTH:
+		tmp = readl(com + U3P_USBPHYACR6);
+		val = FIELD_GET(PA6_RG_U2_DISCTH, tmp);
+		max = FIELD_MAX(PA6_RG_U2_DISCTH);
+		break;
+
+	case U2P_PRE_EMPHASIS:
+		tmp = readl(com + U3P_USBPHYACR6);
+		val = FIELD_GET(PA6_RG_U2_PRE_EMP, tmp);
+		max = FIELD_MAX(PA6_RG_U2_PRE_EMP);
+		break;
+
+	default:
+		seq_printf(sf, "invalid, %d\n", ret);
+		break;
+	}
+
+	seq_printf(sf, "%s : %d [0, %d]\n", fname, val, max);
+
+	return 0;
+}
+
+static int u2_phy_params_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, u2_phy_params_show, inode->i_private);
+}
+
+static ssize_t u2_phy_params_write(struct file *file, const char __user *ubuf,
+				   size_t count, loff_t *ppos)
+{
+	const char *fname = file_dentry(file)->d_iname;
+	struct seq_file *sf = file->private_data;
+	struct mtk_phy_instance *inst = sf->private;
+	struct u2phy_banks *u2_banks = &inst->u2_banks;
+	void __iomem *com = u2_banks->com;
+	ssize_t rc;
+	u32 val;
+	int ret;
+
+	rc = kstrtouint_from_user(ubuf, USER_BUF_LEN(count), 0, &val);
+	if (rc)
+		return rc;
+
+	ret = match_string(u2_phy_files, ARRAY_SIZE(u2_phy_files), fname);
+	if (ret < 0)
+		return (ssize_t)ret;
+
+	switch (ret) {
+	case U2P_EYE_VRT:
+		mtk_phy_update_field(com + U3P_USBPHYACR1, PA1_RG_VRT_SEL, val);
+		break;
+
+	case U2P_EYE_TERM:
+		mtk_phy_update_field(com + U3P_USBPHYACR1, PA1_RG_TERM_SEL, val);
+		break;
+
+	case U2P_EFUSE_EN:
+		if (u2_banks->misc)
+			mtk_phy_update_field(u2_banks->misc + U3P_MISC_REG1,
+					     MR1_EFUSE_AUTO_LOAD_DIS, !!val);
+		break;
+
+	case U2P_EFUSE_INTR:
+		mtk_phy_update_field(com + U3P_USBPHYACR1, PA1_RG_INTR_CAL, val);
+		break;
+
+	case U2P_DISCTH:
+		mtk_phy_update_field(com + U3P_USBPHYACR6, PA6_RG_U2_DISCTH, val);
+		break;
+
+	case U2P_PRE_EMPHASIS:
+		mtk_phy_update_field(com + U3P_USBPHYACR6, PA6_RG_U2_PRE_EMP, val);
+		break;
+
+	default:
+		break;
+	}
+
+	return count;
+}
+
+static const struct file_operations u2_phy_fops = {
+	.open = u2_phy_params_open,
+	.write = u2_phy_params_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static void u2_phy_dbgfs_files_create(struct mtk_phy_instance *inst)
+{
+	u32 count = ARRAY_SIZE(u2_phy_files);
+	int i;
+
+	for (i = 0; i < count; i++)
+		debugfs_create_file(u2_phy_files[i], 0644, inst->dbgfs, inst, &u2_phy_fops);
+}
+
+static int u3_phy_params_show(struct seq_file *sf, void *unused)
+{
+	struct mtk_phy_instance *inst = sf->private;
+	const char *fname = file_dentry(sf->file)->d_iname;
+	struct u3phy_banks *u3_banks = &inst->u3_banks;
+	u32 val = 0;
+	u32 max = 0;
+	u32 tmp;
+	int ret;
+
+	ret = match_string(u3_phy_files, ARRAY_SIZE(u3_phy_files), fname);
+	if (ret < 0)
+		return ret;
+
+	switch (ret) {
+	case U3P_EFUSE_EN:
+		tmp = readl(u3_banks->phyd + U3P_U3_PHYD_RSV);
+		val = !!(tmp & P3D_RG_EFUSE_AUTO_LOAD_DIS);
+		max = 1;
+		break;
+
+	case U3P_EFUSE_INTR:
+		tmp = readl(u3_banks->phya + U3P_U3_PHYA_REG0);
+		val = FIELD_GET(P3A_RG_IEXT_INTR, tmp);
+		max = FIELD_MAX(P3A_RG_IEXT_INTR);
+		break;
+
+	case U3P_EFUSE_TX_IMP:
+		tmp = readl(u3_banks->phyd + U3P_U3_PHYD_IMPCAL0);
+		val = FIELD_GET(P3D_RG_TX_IMPEL, tmp);
+		max = FIELD_MAX(P3D_RG_TX_IMPEL);
+		break;
+
+	case U3P_EFUSE_RX_IMP:
+		tmp = readl(u3_banks->phyd + U3P_U3_PHYD_IMPCAL1);
+		val = FIELD_GET(P3D_RG_RX_IMPEL, tmp);
+		max = FIELD_MAX(P3D_RG_RX_IMPEL);
+		break;
+
+	default:
+		seq_printf(sf, "invalid, %d\n", ret);
+		break;
+	}
+
+	seq_printf(sf, "%s : %d [0, %d]\n", fname, val, max);
+
+	return 0;
+}
+
+static int u3_phy_params_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, u3_phy_params_show, inode->i_private);
+}
+
+static ssize_t u3_phy_params_write(struct file *file, const char __user *ubuf,
+				   size_t count, loff_t *ppos)
+{
+	const char *fname = file_dentry(file)->d_iname;
+	struct seq_file *sf = file->private_data;
+	struct mtk_phy_instance *inst = sf->private;
+	struct u3phy_banks *u3_banks = &inst->u3_banks;
+	void __iomem *phyd = u3_banks->phyd;
+	ssize_t rc;
+	u32 val;
+	int ret;
+
+	rc = kstrtouint_from_user(ubuf, USER_BUF_LEN(count), 0, &val);
+	if (rc)
+		return rc;
+
+	ret = match_string(u3_phy_files, ARRAY_SIZE(u3_phy_files), fname);
+	if (ret < 0)
+		return (ssize_t)ret;
+
+	switch (ret) {
+	case U3P_EFUSE_EN:
+		mtk_phy_update_field(phyd + U3P_U3_PHYD_RSV,
+				     P3D_RG_EFUSE_AUTO_LOAD_DIS, !!val);
+		break;
+
+	case U3P_EFUSE_INTR:
+		mtk_phy_update_field(u3_banks->phya + U3P_U3_PHYA_REG0, P3A_RG_IEXT_INTR, val);
+		break;
+
+	case U3P_EFUSE_TX_IMP:
+		mtk_phy_update_field(phyd + U3P_U3_PHYD_IMPCAL0, P3D_RG_TX_IMPEL, val);
+		mtk_phy_set_bits(phyd + U3P_U3_PHYD_IMPCAL0, P3D_RG_FORCE_TX_IMPEL);
+		break;
+
+	case U3P_EFUSE_RX_IMP:
+		mtk_phy_update_field(phyd + U3P_U3_PHYD_IMPCAL1, P3D_RG_RX_IMPEL, val);
+		mtk_phy_set_bits(phyd + U3P_U3_PHYD_IMPCAL1, P3D_RG_FORCE_RX_IMPEL);
+		break;
+
+	default:
+		break;
+	}
+
+	return count;
+}
+
+static const struct file_operations u3_phy_fops = {
+	.open = u3_phy_params_open,
+	.write = u3_phy_params_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static void u3_phy_dbgfs_files_create(struct mtk_phy_instance *inst)
+{
+	u32 count = ARRAY_SIZE(u3_phy_files);
+	int i;
+
+	for (i = 0; i < count; i++)
+		debugfs_create_file(u3_phy_files[i], 0644, inst->dbgfs, inst, &u3_phy_fops);
+}
+
+static int tphy_type_show(struct seq_file *sf, void *unused)
+{
+	struct mtk_phy_instance *inst = sf->private;
+	const char *type;
+
+	switch (inst->type) {
+	case PHY_TYPE_USB2:
+		type = "USB2";
+		break;
+	case PHY_TYPE_USB3:
+		type = "USB3";
+		break;
+	case PHY_TYPE_PCIE:
+		type = "PCIe";
+		break;
+	case PHY_TYPE_SGMII:
+		type = "SGMII";
+		break;
+	case PHY_TYPE_SATA:
+		type = "SATA";
+		break;
+	default:
+		type = "";
+	}
+
+	seq_printf(sf, "%s\n", type);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(tphy_type);
+
+static void tphy_debugfs_init(struct mtk_tphy *tphy, struct mtk_phy_instance *inst)
+{
+	char name[16];
+
+	snprintf(name, sizeof(name) - 1, "phy.%d", inst->index);
+	inst->dbgfs = debugfs_create_dir(name, tphy->dbgfs_root);
+
+	debugfs_create_file("type", 0444, inst->dbgfs, inst, &tphy_type_fops);
+
+	switch (inst->type) {
+	case PHY_TYPE_USB2:
+		u2_phy_dbgfs_files_create(inst);
+		break;
+	case PHY_TYPE_USB3:
+	case PHY_TYPE_PCIE:
+		u3_phy_dbgfs_files_create(inst);
+		break;
+	default:
+		break;
+	}
+}
+
+static void tphy_debugfs_exit(struct mtk_phy_instance *inst)
+{
+	debugfs_remove_recursive(inst->dbgfs);
+	inst->dbgfs = NULL;
+}
+
+static void tphy_debugfs_root_create(struct mtk_tphy *tphy)
+{
+	tphy->dbgfs_root = debugfs_create_dir(dev_name(tphy->dev), phy_debug_root);
+}
+
+static void tphy_debugfs_root_remove(struct mtk_tphy *tphy)
+{
+	debugfs_remove_recursive(tphy->dbgfs_root);
+	tphy->dbgfs_root = NULL;
+}
+
+#else
+
+static void tphy_debugfs_init(struct mtk_tphy *tphy, struct mtk_phy_instance *inst)
+{}
+
+static void tphy_debugfs_exit(struct mtk_phy_instance *inst)
+{}
+
+static void tphy_debugfs_root_create(struct mtk_tphy *tphy)
+{}
+
+static void tphy_debugfs_root_remove(struct mtk_tphy *tphy)
+{}
+
+#endif
+
 static void hs_slew_rate_calibrate(struct mtk_tphy *tphy,
 	struct mtk_phy_instance *instance)
 {
@@ -1032,6 +1417,8 @@ static int mtk_phy_init(struct phy *phy)
 		return -EINVAL;
 	}
 
+	tphy_debugfs_init(tphy, instance);
+
 	return 0;
 }
 
@@ -1068,6 +1455,8 @@ static int mtk_phy_exit(struct phy *phy)
 	struct mtk_phy_instance *instance = phy_get_drvdata(phy);
 	struct mtk_tphy *tphy = dev_get_drvdata(phy->dev.parent);
 
+	tphy_debugfs_exit(instance);
+
 	if (instance->type == PHY_TYPE_USB2)
 		u2_phy_instance_exit(tphy, instance);
 
@@ -1295,15 +1684,29 @@ static int mtk_tphy_probe(struct platform_device *pdev)
 	}
 
 	provider = devm_of_phy_provider_register(dev, mtk_phy_xlate);
+	if (IS_ERR(provider))
+		return dev_err_probe(dev, PTR_ERR(provider), "probe failed\n");
+
+	tphy_debugfs_root_create(tphy);
+	return 0;
 
-	return PTR_ERR_OR_ZERO(provider);
 put_child:
 	of_node_put(child_np);
 	return retval;
 }
 
+static int mtk_tphy_remove(struct platform_device *pdev)
+{
+	struct mtk_tphy *tphy;
+
+	tphy = platform_get_drvdata(pdev);
+	tphy_debugfs_root_remove(tphy);
+	return 0;
+}
+
 static struct platform_driver mtk_tphy_driver = {
 	.probe		= mtk_tphy_probe,
+	.remove		= mtk_tphy_remove,
 	.driver		= {
 		.name	= "mtk-tphy",
 		.of_match_table = mtk_tphy_id_table,
-- 
2.18.0

Re: [PATCH v7 3/3] phy: mediatek: tphy: add debugfs files

[AngeloGioacchino Del Regno]

Il 18/01/23 09:43, Chunfeng Yun ha scritto:
> These debugfs files are mainly used to make eye diagram test easier,
> especially helpful to do HQA test for a new IC without efuse enabled.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Re: [PATCH v7 1/3] phy: mediatek: remove temporary variable @mask_

[AngeloGioacchino Del Regno]

Il 18/01/23 09:43, Chunfeng Yun ha scritto:
> Remove the temporary @mask_, this may cause build warning when use clang
> compiler for powerpc, but can't reproduce it when compile for arm64.
> the build warning is caused by:
> 
> "warning: result of comparison of constant 18446744073709551615 with
> expression of type (aka 'unsigned long') is always false
> [-Wtautological-constant-out-of-range-compare]"
> 
> More information provided in below lore link.
> 
> After removing @mask_, there is a "CHECK:MACRO_ARG_REUSE" when run
> checkpatch.pl, but due to @mask is constant, no reuse problem will happen.
> 
> Link: https://lore.kernel.org/lkml/202212160357.jJuesD8n-lkp@intel.com/t/
> Fixes: 84513eccd678 ("phy: mediatek: fix build warning of FIELD_PREP()")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Re: [PATCH v7 1/3] phy: mediatek: remove temporary variable @mask_

[Vinod Koul]

On 18-01-23, 16:43, Chunfeng Yun wrote:
> Remove the temporary @mask_, this may cause build warning when use clang
> compiler for powerpc, but can't reproduce it when compile for arm64.
> the build warning is caused by:
> 
> "warning: result of comparison of constant 18446744073709551615 with
> expression of type (aka 'unsigned long') is always false
> [-Wtautological-constant-out-of-range-compare]"
> 
> More information provided in below lore link.
> 
> After removing @mask_, there is a "CHECK:MACRO_ARG_REUSE" when run
> checkpatch.pl, but due to @mask is constant, no reuse problem will happen.

Applied, thanks

-- 
~Vinod