[PATCH 0/3] change exynos ufs phy control

[PATCH 0/3] change exynos ufs phy control

[Chanho Park]

Since commit 1599069a62c6 ("phy: core: Warn when phy_power_on is called
before phy_init"), below warning has been reported.

phy_power_on was called before phy_init

To address this, we need to remove phy_power_on from
exynos_ufs_phy_init.

The first patch is for changing phy clocks manipulation from controlling
each symbol/ref clocks to clk_bulk APIs. The second patch is for making
power on/off sequences between pmu isolation and clk control.
Finally, the third patch changes the phy on/off and init sequences from
ufs-exynos host driver.

Chanho Park (3):
  phy: samsung-ufs: convert phy clk usage to clk_bulk API
  phy: samsung-ufs: ufs: change phy on/off control
  ufs: ufs-exynos: change ufs phy control sequence

 drivers/phy/samsung/phy-exynos7-ufs.c      |   7 +-
 drivers/phy/samsung/phy-exynosautov9-ufs.c |   7 +-
 drivers/phy/samsung/phy-fsd-ufs.c          |   7 +-
 drivers/phy/samsung/phy-samsung-ufs.c      | 121 ++++++---------------
 drivers/phy/samsung/phy-samsung-ufs.h      |  10 +-
 drivers/ufs/host/ufs-exynos.c              |  13 ++-
 6 files changed, 63 insertions(+), 102 deletions(-)

-- 
2.37.0


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[PATCH 1/3] phy: samsung-ufs: convert phy clk usage to clk_bulk API

[Chanho Park]

Instead of using separated clock manipulation, this converts the phy
clock usage to be clk_bulk APIs. By using this, we can completely
remove has_symbol_clk check and symbol clk variables.
Furthermore, clk_get should be moved to probe because there is no need
to get them in the phy_init callback.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
---
 drivers/phy/samsung/phy-exynos7-ufs.c      |  7 +-
 drivers/phy/samsung/phy-exynosautov9-ufs.c |  7 +-
 drivers/phy/samsung/phy-fsd-ufs.c          |  7 +-
 drivers/phy/samsung/phy-samsung-ufs.c      | 99 +++++-----------------
 drivers/phy/samsung/phy-samsung-ufs.h      | 10 +--
 5 files changed, 42 insertions(+), 88 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos7-ufs.c b/drivers/phy/samsung/phy-exynos7-ufs.c
index 72854336f59d..a982e7c128c5 100644
--- a/drivers/phy/samsung/phy-exynos7-ufs.c
+++ b/drivers/phy/samsung/phy-exynos7-ufs.c
@@ -68,6 +68,10 @@ static const struct samsung_ufs_phy_cfg *exynos7_ufs_phy_cfgs[CFG_TAG_MAX] = {
 	[CFG_POST_PWR_HS]	= exynos7_post_pwr_hs_cfg,
 };
 
+static const char * const exynos7_ufs_phy_clks[] = {
+	"tx0_symbol_clk", "rx0_symbol_clk", "rx1_symbol_clk", "ref_clk",
+};
+
 const struct samsung_ufs_phy_drvdata exynos7_ufs_phy = {
 	.cfgs = exynos7_ufs_phy_cfgs,
 	.isol = {
@@ -75,6 +79,7 @@ const struct samsung_ufs_phy_drvdata exynos7_ufs_phy = {
 		.mask = EXYNOS7_EMBEDDED_COMBO_PHY_CTRL_MASK,
 		.en = EXYNOS7_EMBEDDED_COMBO_PHY_CTRL_EN,
 	},
-	.has_symbol_clk = 1,
+	.clk_list = exynos7_ufs_phy_clks,
+	.num_clks = ARRAY_SIZE(exynos7_ufs_phy_clks),
 	.cdr_lock_status_offset = EXYNOS7_EMBEDDED_COMBO_PHY_CDR_LOCK_STATUS,
 };
diff --git a/drivers/phy/samsung/phy-exynosautov9-ufs.c b/drivers/phy/samsung/phy-exynosautov9-ufs.c
index 2b256070d657..49e2bcbef0b4 100644
--- a/drivers/phy/samsung/phy-exynosautov9-ufs.c
+++ b/drivers/phy/samsung/phy-exynosautov9-ufs.c
@@ -57,6 +57,10 @@ static const struct samsung_ufs_phy_cfg *exynosautov9_ufs_phy_cfgs[CFG_TAG_MAX]
 	[CFG_PRE_PWR_HS]	= exynosautov9_pre_pwr_hs_cfg,
 };
 
+static const char * const exynosautov9_ufs_phy_clks[] = {
+	"ref_clk",
+};
+
 const struct samsung_ufs_phy_drvdata exynosautov9_ufs_phy = {
 	.cfgs = exynosautov9_ufs_phy_cfgs,
 	.isol = {
@@ -64,6 +68,7 @@ const struct samsung_ufs_phy_drvdata exynosautov9_ufs_phy = {
 		.mask = EXYNOSAUTOV9_EMBEDDED_COMBO_PHY_CTRL_MASK,
 		.en = EXYNOSAUTOV9_EMBEDDED_COMBO_PHY_CTRL_EN,
 	},
-	.has_symbol_clk = 0,
+	.clk_list = exynosautov9_ufs_phy_clks,
+	.num_clks = ARRAY_SIZE(exynosautov9_ufs_phy_clks),
 	.cdr_lock_status_offset = EXYNOSAUTOV9_EMBEDDED_COMBO_PHY_CDR_LOCK_STATUS,
 };
diff --git a/drivers/phy/samsung/phy-fsd-ufs.c b/drivers/phy/samsung/phy-fsd-ufs.c
index c78b6c16027d..d36cabd53434 100644
--- a/drivers/phy/samsung/phy-fsd-ufs.c
+++ b/drivers/phy/samsung/phy-fsd-ufs.c
@@ -46,6 +46,10 @@ static const struct samsung_ufs_phy_cfg *fsd_ufs_phy_cfgs[CFG_TAG_MAX] = {
 	[CFG_POST_PWR_HS]	= fsd_post_pwr_hs_cfg,
 };
 
+static const char * const fsd_ufs_phy_clks[] = {
+	"ref_clk",
+};
+
 const struct samsung_ufs_phy_drvdata fsd_ufs_phy = {
 	.cfgs = fsd_ufs_phy_cfgs,
 	.isol = {
@@ -53,6 +57,7 @@ const struct samsung_ufs_phy_drvdata fsd_ufs_phy = {
 		.mask = FSD_EMBEDDED_COMBO_PHY_CTRL_MASK,
 		.en = FSD_EMBEDDED_COMBO_PHY_CTRL_EN,
 	},
-	.has_symbol_clk = 0,
+	.clk_list = fsd_ufs_phy_clks,
+	.num_clks = ARRAY_SIZE(fsd_ufs_phy_clks),
 	.cdr_lock_status_offset = FSD_EMBEDDED_COMBO_PHY_CDR_LOCK_STATUS,
 };
diff --git a/drivers/phy/samsung/phy-samsung-ufs.c b/drivers/phy/samsung/phy-samsung-ufs.c
index e4334529ffbc..14cce2f2487e 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.c
+++ b/drivers/phy/samsung/phy-samsung-ufs.c
@@ -131,73 +131,21 @@ static int samsung_ufs_phy_calibrate(struct phy *phy)
 	return err;
 }
 
-static int samsung_ufs_phy_symbol_clk_init(struct samsung_ufs_phy *phy)
-{
-	int ret;
-
-	phy->tx0_symbol_clk = devm_clk_get(phy->dev, "tx0_symbol_clk");
-	if (IS_ERR(phy->tx0_symbol_clk)) {
-		dev_err(phy->dev, "failed to get tx0_symbol_clk clock\n");
-		return PTR_ERR(phy->tx0_symbol_clk);
-	}
-
-	phy->rx0_symbol_clk = devm_clk_get(phy->dev, "rx0_symbol_clk");
-	if (IS_ERR(phy->rx0_symbol_clk)) {
-		dev_err(phy->dev, "failed to get rx0_symbol_clk clock\n");
-		return PTR_ERR(phy->rx0_symbol_clk);
-	}
-
-	phy->rx1_symbol_clk = devm_clk_get(phy->dev, "rx1_symbol_clk");
-	if (IS_ERR(phy->rx1_symbol_clk)) {
-		dev_err(phy->dev, "failed to get rx1_symbol_clk clock\n");
-		return PTR_ERR(phy->rx1_symbol_clk);
-	}
-
-	ret = clk_prepare_enable(phy->tx0_symbol_clk);
-	if (ret) {
-		dev_err(phy->dev, "%s: tx0_symbol_clk enable failed %d\n", __func__, ret);
-		goto out;
-	}
-
-	ret = clk_prepare_enable(phy->rx0_symbol_clk);
-	if (ret) {
-		dev_err(phy->dev, "%s: rx0_symbol_clk enable failed %d\n", __func__, ret);
-		goto out_disable_tx0_clk;
-	}
-
-	ret = clk_prepare_enable(phy->rx1_symbol_clk);
-	if (ret) {
-		dev_err(phy->dev, "%s: rx1_symbol_clk enable failed %d\n", __func__, ret);
-		goto out_disable_rx0_clk;
-	}
-
-	return 0;
-
-out_disable_rx0_clk:
-	clk_disable_unprepare(phy->rx0_symbol_clk);
-out_disable_tx0_clk:
-	clk_disable_unprepare(phy->tx0_symbol_clk);
-out:
-	return ret;
-}
-
 static int samsung_ufs_phy_clks_init(struct samsung_ufs_phy *phy)
 {
-	int ret;
-
-	phy->ref_clk = devm_clk_get(phy->dev, "ref_clk");
-	if (IS_ERR(phy->ref_clk))
-		dev_err(phy->dev, "failed to get ref_clk clock\n");
+	int i;
+	const struct samsung_ufs_phy_drvdata *drvdata = phy->drvdata;
+	int num_clks = drvdata->num_clks;
 
-	ret = clk_prepare_enable(phy->ref_clk);
-	if (ret) {
-		dev_err(phy->dev, "%s: ref_clk enable failed %d\n", __func__, ret);
-		return ret;
-	}
+	phy->clks = devm_kcalloc(phy->dev, num_clks, sizeof(*phy->clks),
+				 GFP_KERNEL);
+	if (!phy->clks)
+		return -ENOMEM;
 
-	dev_dbg(phy->dev, "UFS MPHY ref_clk_rate = %ld\n", clk_get_rate(phy->ref_clk));
+	for (i = 0; i < num_clks; i++)
+		phy->clks[i].id = drvdata->clk_list[i];
 
-	return 0;
+	return devm_clk_bulk_get(phy->dev, num_clks, phy->clks);
 }
 
 static int samsung_ufs_phy_init(struct phy *phy)
@@ -208,16 +156,12 @@ static int samsung_ufs_phy_init(struct phy *phy)
 	ss_phy->lane_cnt = phy->attrs.bus_width;
 	ss_phy->ufs_phy_state = CFG_PRE_INIT;
 
-	if (ss_phy->has_symbol_clk) {
-		ret = samsung_ufs_phy_symbol_clk_init(ss_phy);
-		if (ret)
-			dev_err(ss_phy->dev, "failed to set ufs phy symbol clocks\n");
+	ret = clk_bulk_prepare_enable(ss_phy->drvdata->num_clks, ss_phy->clks);
+	if (ret) {
+		dev_err(ss_phy->dev, "failed to enable ufs phy clocks\n");
+		return ret;
 	}
 
-	ret = samsung_ufs_phy_clks_init(ss_phy);
-	if (ret)
-		dev_err(ss_phy->dev, "failed to set ufs phy clocks\n");
-
 	ret = samsung_ufs_phy_calibrate(phy);
 	if (ret)
 		dev_err(ss_phy->dev, "ufs phy calibration failed\n");
@@ -258,13 +202,7 @@ static int samsung_ufs_phy_exit(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
 
-	clk_disable_unprepare(ss_phy->ref_clk);
-
-	if (ss_phy->has_symbol_clk) {
-		clk_disable_unprepare(ss_phy->tx0_symbol_clk);
-		clk_disable_unprepare(ss_phy->rx0_symbol_clk);
-		clk_disable_unprepare(ss_phy->rx1_symbol_clk);
-	}
+	clk_bulk_disable_unprepare(ss_phy->drvdata->num_clks, ss_phy->clks);
 
 	return 0;
 }
@@ -330,7 +268,6 @@ static int samsung_ufs_phy_probe(struct platform_device *pdev)
 	phy->dev = dev;
 	phy->drvdata = drvdata;
 	phy->cfgs = drvdata->cfgs;
-	phy->has_symbol_clk = drvdata->has_symbol_clk;
 	memcpy(&phy->isol, &drvdata->isol, sizeof(phy->isol));
 
 	if (!of_property_read_u32_index(dev->of_node, "samsung,pmu-syscon", 1,
@@ -339,6 +276,12 @@ static int samsung_ufs_phy_probe(struct platform_device *pdev)
 
 	phy->lane_cnt = PHY_DEF_LANE_CNT;
 
+	err = samsung_ufs_phy_clks_init(phy);
+	if (err) {
+		dev_err(dev, "failed to get phy clocks\n");
+		goto out;
+	}
+
 	phy_set_drvdata(gen_phy, phy);
 
 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
diff --git a/drivers/phy/samsung/phy-samsung-ufs.h b/drivers/phy/samsung/phy-samsung-ufs.h
index 6320ac852f29..e122960cfee8 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.h
+++ b/drivers/phy/samsung/phy-samsung-ufs.h
@@ -109,7 +109,8 @@ struct samsung_ufs_phy_pmu_isol {
 struct samsung_ufs_phy_drvdata {
 	const struct samsung_ufs_phy_cfg **cfgs;
 	struct samsung_ufs_phy_pmu_isol isol;
-	bool has_symbol_clk;
+	const char * const *clk_list;
+	int num_clks;
 	u32 cdr_lock_status_offset;
 };
 
@@ -117,15 +118,10 @@ struct samsung_ufs_phy {
 	struct device *dev;
 	void __iomem *reg_pma;
 	struct regmap *reg_pmu;
-	struct clk *ref_clk;
-	struct clk *ref_clk_parent;
-	struct clk *tx0_symbol_clk;
-	struct clk *rx0_symbol_clk;
-	struct clk *rx1_symbol_clk;
+	struct clk_bulk_data *clks;
 	const struct samsung_ufs_phy_drvdata *drvdata;
 	const struct samsung_ufs_phy_cfg * const *cfgs;
 	struct samsung_ufs_phy_pmu_isol isol;
-	bool has_symbol_clk;
 	u8 lane_cnt;
 	int ufs_phy_state;
 	enum phy_mode mode;
-- 
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Re: [PATCH 1/3] phy: samsung-ufs: convert phy clk usage to clk_bulk API

[Krzysztof Kozlowski]

On 05/07/2022 08:54, Chanho Park wrote:
> Instead of using separated clock manipulation, this converts the phy
> clock usage to be clk_bulk APIs. By using this, we can completely
> remove has_symbol_clk check and symbol clk variables.
> Furthermore, clk_get should be moved to probe because there is no need
> to get them in the phy_init callback.
> 
> Signed-off-by: Chanho Park <chanho61.park@samsung.com>


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

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[PATCH 2/3] phy: samsung-ufs: ufs: change phy on/off control

[Chanho Park]

The sequence of controlling ufs phy block should be below:

1) Power On
 - Turn off pmu isolation
 - Clock enable
2) Power Off
 - Clock disable
 - Turn on pmu isolation

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
---
 drivers/phy/samsung/phy-samsung-ufs.c | 32 ++++++++++++++++-----------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/phy/samsung/phy-samsung-ufs.c b/drivers/phy/samsung/phy-samsung-ufs.c
index 14cce2f2487e..183c88e3d1ec 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.c
+++ b/drivers/phy/samsung/phy-samsung-ufs.c
@@ -151,37 +151,43 @@ static int samsung_ufs_phy_clks_init(struct samsung_ufs_phy *phy)
 static int samsung_ufs_phy_init(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
-	int ret;
 
 	ss_phy->lane_cnt = phy->attrs.bus_width;
 	ss_phy->ufs_phy_state = CFG_PRE_INIT;
 
+	return 0;
+}
+
+static int samsung_ufs_phy_power_on(struct phy *phy)
+{
+	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
+	int ret;
+
+	samsung_ufs_phy_ctrl_isol(ss_phy, false);
+
 	ret = clk_bulk_prepare_enable(ss_phy->drvdata->num_clks, ss_phy->clks);
 	if (ret) {
 		dev_err(ss_phy->dev, "failed to enable ufs phy clocks\n");
 		return ret;
 	}
 
-	ret = samsung_ufs_phy_calibrate(phy);
-	if (ret)
-		dev_err(ss_phy->dev, "ufs phy calibration failed\n");
+	if (ss_phy->ufs_phy_state == CFG_PRE_INIT) {
+		ret = samsung_ufs_phy_calibrate(phy);
+		if (ret)
+			dev_err(ss_phy->dev, "ufs phy calibration failed\n");
+	}
 
 	return ret;
 }
 
-static int samsung_ufs_phy_power_on(struct phy *phy)
-{
-	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
-
-	samsung_ufs_phy_ctrl_isol(ss_phy, false);
-	return 0;
-}
-
 static int samsung_ufs_phy_power_off(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
 
+	clk_bulk_disable_unprepare(ss_phy->drvdata->num_clks, ss_phy->clks);
+
 	samsung_ufs_phy_ctrl_isol(ss_phy, true);
+
 	return 0;
 }
 
@@ -202,7 +208,7 @@ static int samsung_ufs_phy_exit(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
 
-	clk_bulk_disable_unprepare(ss_phy->drvdata->num_clks, ss_phy->clks);
+	ss_phy->ufs_phy_state = CFG_TAG_MAX;
 
 	return 0;
 }
-- 
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Re: [PATCH 2/3] phy: samsung-ufs: ufs: change phy on/off control

[Krzysztof Kozlowski]

On 05/07/2022 08:54, Chanho Park wrote:
> The sequence of controlling ufs phy block should be below:
> 
> 1) Power On
>  - Turn off pmu isolation
>  - Clock enable
> 2) Power Off
>  - Clock disable
>  - Turn on pmu isolation
> 

Makes sense.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

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[PATCH 3/3] ufs: ufs-exynos: change ufs phy control sequence

[Chanho Park]

Since commit 1599069a62c6 ("phy: core: Warn when phy_power_on is called
before phy_init"), below warning has been reported.

phy_power_on was called before phy_init

To address this, we need to remove phy_power_on from
exynos_ufs_phy_init and move it after phy_init. phy_power_off and
phy_exit are also necessary in exynos_ufs_remove.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
---
 drivers/ufs/host/ufs-exynos.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index f971569bafc7..5718296e2521 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -908,6 +908,8 @@ static int exynos_ufs_phy_init(struct exynos_ufs *ufs)
 		goto out_exit_phy;
 	}
 
+	phy_power_on(generic_phy);
+
 	return 0;
 
 out_exit_phy:
@@ -1169,10 +1171,6 @@ static int exynos_ufs_init(struct ufs_hba *hba)
 		goto out;
 	}
 
-	ret = phy_power_on(ufs->phy);
-	if (ret)
-		goto phy_off;
-
 	exynos_ufs_priv_init(hba, ufs);
 
 	if (ufs->drv_data->drv_init) {
@@ -1190,8 +1188,6 @@ static int exynos_ufs_init(struct ufs_hba *hba)
 	exynos_ufs_config_smu(ufs);
 	return 0;
 
-phy_off:
-	phy_power_off(ufs->phy);
 out:
 	hba->priv = NULL;
 	return ret;
@@ -1602,9 +1598,14 @@ static int exynos_ufs_probe(struct platform_device *pdev)
 static int exynos_ufs_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
+	struct exynos_ufs *ufs = ufshcd_get_variant(hba);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
+
+	phy_power_off(ufs->phy);
+	phy_exit(ufs->phy);
+
 	return 0;
 }
 
-- 
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Re: [PATCH 3/3] ufs: ufs-exynos: change ufs phy control sequence

[Krzysztof Kozlowski]

On 05/07/2022 08:54, Chanho Park wrote:
> Since commit 1599069a62c6 ("phy: core: Warn when phy_power_on is called
> before phy_init"), below warning has been reported.
> 
> phy_power_on was called before phy_init
> 
> To address this, we need to remove phy_power_on from
> exynos_ufs_phy_init and move it after phy_init. phy_power_off and
> phy_exit are also necessary in exynos_ufs_remove.
> 
> Signed-off-by: Chanho Park <chanho61.park@samsung.com>
> ---
>  drivers/ufs/host/ufs-exynos.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
> index f971569bafc7..5718296e2521 100644
> --- a/drivers/ufs/host/ufs-exynos.c
> +++ b/drivers/ufs/host/ufs-exynos.c
> @@ -908,6 +908,8 @@ static int exynos_ufs_phy_init(struct exynos_ufs *ufs)
>  		goto out_exit_phy;
>  	}
>  
> +	phy_power_on(generic_phy);


What about phy_power_on() return code?

> +
>  	return 0;
>  
>  out_exit_phy:
> @@ -1169,10 +1171,6 @@ static int exynos_ufs_init(struct ufs_hba *hba)
>  		goto out;
>  	}
>  
> -	ret = phy_power_on(ufs->phy);
> -	if (ret)
> -		goto phy_off;
> -


Best regards,
Krzysztof

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RE: [PATCH 3/3] ufs: ufs-exynos: change ufs phy control sequence

[Chanho Park]

> > Since commit 1599069a62c6 ("phy: core: Warn when phy_power_on is
> > called before phy_init"), below warning has been reported.
> >
> > phy_power_on was called before phy_init
> >
> > To address this, we need to remove phy_power_on from
> > exynos_ufs_phy_init and move it after phy_init. phy_power_off and
> > phy_exit are also necessary in exynos_ufs_remove.
> >
> > Signed-off-by: Chanho Park <chanho61.park@samsung.com>
> > ---
> >  drivers/ufs/host/ufs-exynos.c | 13 +++++++------
> >  1 file changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/ufs/host/ufs-exynos.c
> > b/drivers/ufs/host/ufs-exynos.c index f971569bafc7..5718296e2521
> > 100644
> > --- a/drivers/ufs/host/ufs-exynos.c
> > +++ b/drivers/ufs/host/ufs-exynos.c
> > @@ -908,6 +908,8 @@ static int exynos_ufs_phy_init(struct exynos_ufs
> *ufs)
> >  		goto out_exit_phy;
> >  	}
> >
> > +	phy_power_on(generic_phy);
> 
> 
> What about phy_power_on() return code?

I'll back the check next patch.

Best Regards,
Chanho Park


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