diff mbox series

[v4,01/15] PCI: imx6: Simplify clock handling by using bulk_clk_*() function

Message ID 20231217051210.754832-2-Frank.Li@nxp.com
State Superseded
Headers show
Series PCI: imx6: Clean up and add imx95 pci support | expand

Commit Message

Frank Li Dec. 17, 2023, 5:11 a.m. UTC 
Refactors the clock handling logic in the imx6 PCI driver by adding
clk_names[] define in drvdata . Simplifies the code and makes it more
maintainable, as future additions of SOC support will only require
straightforward changes.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    Change from v3 to v4
    - using clk_bulk_*() API
    Change from v1 to v3
    - none

 drivers/pci/controller/dwc/pci-imx6.c | 128 ++++++++------------------
 1 file changed, 38 insertions(+), 90 deletions(-)

Comments

Frank Li Dec. 18, 2023, 2:28 p.m. UTC | #1 
On Sun, Dec 17, 2023 at 10:36:55PM +0530, Manivannan Sadhasivam wrote:
> On Sun, Dec 17, 2023 at 12:11:56AM -0500, Frank Li wrote:
> > Refactors the clock handling logic in the imx6 PCI driver by adding
> > clk_names[] define in drvdata . Simplifies the code and makes it more
> > maintainable, as future additions of SOC support will only require
> > straightforward changes.
> > 
> 
> Commit description should be in imperative mood as per
> Documentation/process/submitting-patches.rst:
> 
> "Describe your changes in imperative mood, e.g. "make xyzzy do frotz"
> instead of "[This patch] makes xyzzy do frotz" or "[I] changed xyzzy
> to do frotz", as if you are giving orders to the codebase to change
> its behaviour."

How about: 

Refactors the clock handling logic. Adds clk_names[] define in drvdata.
Using clk_bulk*() api simplifies the code.

> 
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> > ---
> > 
> > Notes:
> >     Change from v3 to v4
> >     - using clk_bulk_*() API
> >     Change from v1 to v3
> >     - none
> > 
> >  drivers/pci/controller/dwc/pci-imx6.c | 128 ++++++++------------------
> >  1 file changed, 38 insertions(+), 90 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 74703362aeec7..2086214345e9a 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> 
> [...]
> 
> >  static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> > @@ -1305,32 +1265,19 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  		return imx6_pcie->reset_gpio;
> >  	}
> >  
> > -	/* Fetch clocks */
> > -	imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
> > -	if (IS_ERR(imx6_pcie->pcie_bus))
> > -		return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_bus),
> > -				     "pcie_bus clock source missing or invalid\n");
> > +	while (imx6_pcie->drvdata->clk_names[imx6_pcie->clks_cnt]) {
> > +		int i = imx6_pcie->clks_cnt;
> >  
> > -	imx6_pcie->pcie = devm_clk_get(dev, "pcie");
> > -	if (IS_ERR(imx6_pcie->pcie))
> > -		return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie),
> > -				     "pcie clock source missing or invalid\n");
> > +		imx6_pcie->clks[i].id = imx6_pcie->drvdata->clk_names[i];
> > +		imx6_pcie->clks_cnt++;
> 
> You can just initialize clks_cnt in drv_data with sizeof() of clk_names.

sizeof will return pre allocated clk_names size, for here, it should be 6.
Not initilized string cnt.

or you have to duplicate two line 
	clk_names = {"clk1", "clk2", ...},
	clks_cnt = ARRAY_SIZE({"clk1", "clk2", ...},


Anyway, it need copy to clks[i].id, count here is simple.

Frank


> 
> > +	}
> > +
> > +	/* Fetch clocks */
> > +	ret = devm_clk_bulk_get(dev, imx6_pcie->clks_cnt, imx6_pcie->clks);
> > +	if (ret)
> > +		return ret;
> >  
> >  	switch (imx6_pcie->drvdata->variant) {
> > -	case IMX6SX:
> > -		imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
> > -							   "pcie_inbound_axi");
> > -		if (IS_ERR(imx6_pcie->pcie_inbound_axi))
> > -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi),
> > -					     "pcie_inbound_axi clock missing or invalid\n");
> > -		break;
> > -	case IMX8MQ:
> > -	case IMX8MQ_EP:
> > -		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
> > -		if (IS_ERR(imx6_pcie->pcie_aux))
> > -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
> > -					     "pcie_aux clock source missing or invalid\n");
> > -		fallthrough;
> >  	case IMX7D:
> >  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> >  			imx6_pcie->controller_id = 1;
> > @@ -1353,10 +1300,6 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  	case IMX8MM_EP:
> >  	case IMX8MP:
> >  	case IMX8MP_EP:
> > -		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
> > -		if (IS_ERR(imx6_pcie->pcie_aux))
> > -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
> > -					     "pcie_aux clock source missing or invalid\n");
> >  		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> >  									 "apps");
> >  		if (IS_ERR(imx6_pcie->apps_reset))
> > @@ -1372,14 +1315,6 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  	default:
> >  		break;
> >  	}
> > -	/* Don't fetch the pcie_phy clock, if it has abstract PHY driver */
> > -	if (imx6_pcie->phy == NULL) {
> > -		imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
> > -		if (IS_ERR(imx6_pcie->pcie_phy))
> > -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_phy),
> > -					     "pcie_phy clock source missing or invalid\n");
> > -	}
> > -
> >  
> >  	/* Grab turnoff reset */
> >  	imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
> > @@ -1470,6 +1405,9 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
> >  	imx6_pcie_assert_core_reset(imx6_pcie);
> >  }
> >  
> > +#define IMX6_CLKS_COMMON "pcie_bus", "pcie"
> > +#define IMX6_CLKS_NO_PHYDRV IMX6_CLKS_COMMON, "pcie_phy"
> > +
> 
> Just use the clock names directly instead of definitions. It makes the code more
> readable.
> 
> Rest LGTM!
> 
> - Mani
> 
> -- 
> மணிவண்ணன் சதாசிவம்
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 74703362aeec7..2086214345e9a 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -61,12 +61,15 @@  enum imx6_pcie_variants {
 #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE	BIT(1)
 #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND		BIT(2)
 
+#define IMX6_PCIE_MAX_CLKS       6
+
 struct imx6_pcie_drvdata {
 	enum imx6_pcie_variants variant;
 	enum dw_pcie_device_mode mode;
 	u32 flags;
 	int dbi_length;
 	const char *gpr;
+	const char *clk_names[IMX6_PCIE_MAX_CLKS];
 };
 
 struct imx6_pcie {
@@ -74,11 +77,8 @@  struct imx6_pcie {
 	int			reset_gpio;
 	bool			gpio_active_high;
 	bool			link_is_up;
-	struct clk		*pcie_bus;
-	struct clk		*pcie_phy;
-	struct clk		*pcie_inbound_axi;
-	struct clk		*pcie;
-	struct clk		*pcie_aux;
+	struct clk_bulk_data	clks[IMX6_PCIE_MAX_CLKS];
+	u32			clks_cnt;
 	struct regmap		*iomuxc_gpr;
 	u16			msi_ctrl;
 	u32			controller_id;
@@ -407,13 +407,18 @@  static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
 
 static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
 {
-	unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
+	unsigned long phy_rate = 0;
 	int mult, div;
 	u16 val;
+	int i;
 
 	if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
 		return 0;
 
+	for (i = 0; i < imx6_pcie->clks_cnt; i++)
+		if (strncmp(imx6_pcie->clks[i].id, "pcie_phy", 8) == 0)
+			phy_rate = clk_get_rate(imx6_pcie->clks[i].clk);
+
 	switch (phy_rate) {
 	case 125000000:
 		/*
@@ -550,19 +555,11 @@  static int imx6_pcie_attach_pd(struct device *dev)
 
 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
-	struct dw_pcie *pci = imx6_pcie->pci;
-	struct device *dev = pci->dev;
 	unsigned int offset;
 	int ret = 0;
 
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX6SX:
-		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
-		if (ret) {
-			dev_err(dev, "unable to enable pcie_axi clock\n");
-			break;
-		}
-
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
 		break;
@@ -589,12 +586,6 @@  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 	case IMX8MQ_EP:
 	case IMX8MP:
 	case IMX8MP_EP:
-		ret = clk_prepare_enable(imx6_pcie->pcie_aux);
-		if (ret) {
-			dev_err(dev, "unable to enable pcie_aux clock\n");
-			break;
-		}
-
 		offset = imx6_pcie_grp_offset(imx6_pcie);
 		/*
 		 * Set the over ride low and enabled
@@ -615,9 +606,6 @@  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
 	switch (imx6_pcie->drvdata->variant) {
-	case IMX6SX:
-		clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
-		break;
 	case IMX6QP:
 	case IMX6Q:
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
@@ -631,14 +619,6 @@  static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
 				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
 				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
 		break;
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MQ:
-	case IMX8MQ_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		clk_disable_unprepare(imx6_pcie->pcie_aux);
-		break;
 	default:
 		break;
 	}
@@ -650,23 +630,9 @@  static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
 	struct device *dev = pci->dev;
 	int ret;
 
-	ret = clk_prepare_enable(imx6_pcie->pcie_phy);
-	if (ret) {
-		dev_err(dev, "unable to enable pcie_phy clock\n");
+	ret =  clk_bulk_prepare_enable(imx6_pcie->clks_cnt, imx6_pcie->clks);
+	if (ret)
 		return ret;
-	}
-
-	ret = clk_prepare_enable(imx6_pcie->pcie_bus);
-	if (ret) {
-		dev_err(dev, "unable to enable pcie_bus clock\n");
-		goto err_pcie_bus;
-	}
-
-	ret = clk_prepare_enable(imx6_pcie->pcie);
-	if (ret) {
-		dev_err(dev, "unable to enable pcie clock\n");
-		goto err_pcie;
-	}
 
 	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
 	if (ret) {
@@ -679,11 +645,7 @@  static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
 	return 0;
 
 err_ref_clk:
-	clk_disable_unprepare(imx6_pcie->pcie);
-err_pcie:
-	clk_disable_unprepare(imx6_pcie->pcie_bus);
-err_pcie_bus:
-	clk_disable_unprepare(imx6_pcie->pcie_phy);
+	clk_bulk_disable_unprepare(imx6_pcie->clks_cnt, imx6_pcie->clks);
 
 	return ret;
 }
@@ -691,9 +653,7 @@  static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
 static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
 {
 	imx6_pcie_disable_ref_clk(imx6_pcie);
-	clk_disable_unprepare(imx6_pcie->pcie);
-	clk_disable_unprepare(imx6_pcie->pcie_bus);
-	clk_disable_unprepare(imx6_pcie->pcie_phy);
+	clk_bulk_disable_unprepare(imx6_pcie->clks_cnt, imx6_pcie->clks);
 }
 
 static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
@@ -1305,32 +1265,19 @@  static int imx6_pcie_probe(struct platform_device *pdev)
 		return imx6_pcie->reset_gpio;
 	}
 
-	/* Fetch clocks */
-	imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
-	if (IS_ERR(imx6_pcie->pcie_bus))
-		return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_bus),
-				     "pcie_bus clock source missing or invalid\n");
+	while (imx6_pcie->drvdata->clk_names[imx6_pcie->clks_cnt]) {
+		int i = imx6_pcie->clks_cnt;
 
-	imx6_pcie->pcie = devm_clk_get(dev, "pcie");
-	if (IS_ERR(imx6_pcie->pcie))
-		return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie),
-				     "pcie clock source missing or invalid\n");
+		imx6_pcie->clks[i].id = imx6_pcie->drvdata->clk_names[i];
+		imx6_pcie->clks_cnt++;
+	}
+
+	/* Fetch clocks */
+	ret = devm_clk_bulk_get(dev, imx6_pcie->clks_cnt, imx6_pcie->clks);
+	if (ret)
+		return ret;
 
 	switch (imx6_pcie->drvdata->variant) {
-	case IMX6SX:
-		imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
-							   "pcie_inbound_axi");
-		if (IS_ERR(imx6_pcie->pcie_inbound_axi))
-			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi),
-					     "pcie_inbound_axi clock missing or invalid\n");
-		break;
-	case IMX8MQ:
-	case IMX8MQ_EP:
-		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
-		if (IS_ERR(imx6_pcie->pcie_aux))
-			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
-					     "pcie_aux clock source missing or invalid\n");
-		fallthrough;
 	case IMX7D:
 		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
 			imx6_pcie->controller_id = 1;
@@ -1353,10 +1300,6 @@  static int imx6_pcie_probe(struct platform_device *pdev)
 	case IMX8MM_EP:
 	case IMX8MP:
 	case IMX8MP_EP:
-		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
-		if (IS_ERR(imx6_pcie->pcie_aux))
-			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
-					     "pcie_aux clock source missing or invalid\n");
 		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
 									 "apps");
 		if (IS_ERR(imx6_pcie->apps_reset))
@@ -1372,14 +1315,6 @@  static int imx6_pcie_probe(struct platform_device *pdev)
 	default:
 		break;
 	}
-	/* Don't fetch the pcie_phy clock, if it has abstract PHY driver */
-	if (imx6_pcie->phy == NULL) {
-		imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
-		if (IS_ERR(imx6_pcie->pcie_phy))
-			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_phy),
-					     "pcie_phy clock source missing or invalid\n");
-	}
-
 
 	/* Grab turnoff reset */
 	imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
@@ -1470,6 +1405,9 @@  static void imx6_pcie_shutdown(struct platform_device *pdev)
 	imx6_pcie_assert_core_reset(imx6_pcie);
 }
 
+#define IMX6_CLKS_COMMON "pcie_bus", "pcie"
+#define IMX6_CLKS_NO_PHYDRV IMX6_CLKS_COMMON, "pcie_phy"
+
 static const struct imx6_pcie_drvdata drvdata[] = {
 	[IMX6Q] = {
 		.variant = IMX6Q,
@@ -1477,6 +1415,7 @@  static const struct imx6_pcie_drvdata drvdata[] = {
 			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
 		.dbi_length = 0x200,
 		.gpr = "fsl,imx6q-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV},
 	},
 	[IMX6SX] = {
 		.variant = IMX6SX,
@@ -1484,6 +1423,7 @@  static const struct imx6_pcie_drvdata drvdata[] = {
 			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
 			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.gpr = "fsl,imx6q-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV, "pcie_inbound_axi"},
 	},
 	[IMX6QP] = {
 		.variant = IMX6QP,
@@ -1492,40 +1432,48 @@  static const struct imx6_pcie_drvdata drvdata[] = {
 			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.dbi_length = 0x200,
 		.gpr = "fsl,imx6q-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV},
 	},
 	[IMX7D] = {
 		.variant = IMX7D,
 		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.gpr = "fsl,imx7d-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV},
 	},
 	[IMX8MQ] = {
 		.variant = IMX8MQ,
 		.gpr = "fsl,imx8mq-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV, "pcie_aux"},
 	},
 	[IMX8MM] = {
 		.variant = IMX8MM,
 		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.gpr = "fsl,imx8mm-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_COMMON, "pcie_aux"},
 	},
 	[IMX8MP] = {
 		.variant = IMX8MP,
 		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.gpr = "fsl,imx8mp-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_COMMON, "pcie_aux"},
 	},
 	[IMX8MQ_EP] = {
 		.variant = IMX8MQ_EP,
 		.mode = DW_PCIE_EP_TYPE,
 		.gpr = "fsl,imx8mq-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_NO_PHYDRV, "pcie_aux"},
 	},
 	[IMX8MM_EP] = {
 		.variant = IMX8MM_EP,
 		.mode = DW_PCIE_EP_TYPE,
 		.gpr = "fsl,imx8mm-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_COMMON, "pcie_aux"},
 	},
 	[IMX8MP_EP] = {
 		.variant = IMX8MP_EP,
 		.mode = DW_PCIE_EP_TYPE,
 		.gpr = "fsl,imx8mp-iomuxc-gpr",
+		.clk_names = {IMX6_CLKS_COMMON, "pcie_aux"},
 	},
 };