diff mbox series

[v15,02/13] PCI: kirin: Add support for a PHY layer

Message ID f38361df2e9d0dc5a38ff942b631f7fef64cdc12.1634812676.git.mchehab+huawei@kernel.org (mailing list archive)
State Accepted
Delegated to: Lorenzo Pieralisi
Headers show
Series Add support for Hikey 970 PCIe | expand

Commit Message

Mauro Carvalho Chehab Oct. 21, 2021, 10:45 a.m. UTC 
The pcie-kirin driver contains both PHY and generic PCI driver
on it.

The best would be, instead, to support a PCI PHY driver, making
the driver more generic.

However, it is too late to remove the Kirin 960 PHY, as a change
like that would make the DT schema incompatible with past versions.

So, add support for an external PHY driver without removing the
existing Kirin 960 PHY from it.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Xiaowei Song <songxiaowei@hisilicon.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---

To mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v15 00/13] at: https://lore.kernel.org/all/cover.1634812676.git.mchehab+huawei@kernel.org/

 drivers/pci/controller/dwc/pcie-kirin.c | 95 +++++++++++++++++++++----
 1 file changed, 80 insertions(+), 15 deletions(-)

Comments

Kishon Vijay Abraham I Oct. 25, 2021, 8:14 a.m. UTC | #1 
Hi Mauro,

On 21/10/21 4:15 pm, Mauro Carvalho Chehab wrote:
> The pcie-kirin driver contains both PHY and generic PCI driver
> on it.
> 
> The best would be, instead, to support a PCI PHY driver, making
> the driver more generic.
> 
> However, it is too late to remove the Kirin 960 PHY, as a change
> like that would make the DT schema incompatible with past versions.
> 
> So, add support for an external PHY driver without removing the
> existing Kirin 960 PHY from it.
> 
> Cc: Kishon Vijay Abraham I <kishon@ti.com>
> Acked-by: Xiaowei Song <songxiaowei@hisilicon.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
> 
> To mailbombing on a large number of people, only mailing lists were C/C on the cover.
> See [PATCH v15 00/13] at: https://lore.kernel.org/all/cover.1634812676.git.mchehab+huawei@kernel.org/
> 
>  drivers/pci/controller/dwc/pcie-kirin.c | 95 +++++++++++++++++++++----
>  1 file changed, 80 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index b4063a3434df..91a7c096bf8f 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -8,16 +8,18 @@
>   * Author: Xiaowei Song <songxiaowei@huawei.com>
>   */
>  
> -#include <linux/compiler.h>
>  #include <linux/clk.h>
> +#include <linux/compiler.h>
>  #include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/gpio.h>
>  #include <linux/interrupt.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/of_address.h>
> +#include <linux/of_device.h>
>  #include <linux/of_gpio.h>
>  #include <linux/of_pci.h>
> +#include <linux/phy/phy.h>
>  #include <linux/pci.h>
>  #include <linux/pci_regs.h>
>  #include <linux/platform_device.h>
> @@ -50,11 +52,18 @@
>  #define PCIE_DEBOUNCE_PARAM	0xF0F400
>  #define PCIE_OE_BYPASS		(0x3 << 28)
>  
> +enum pcie_kirin_phy_type {
> +	PCIE_KIRIN_INTERNAL_PHY,
> +	PCIE_KIRIN_EXTERNAL_PHY
> +};
> +
>  struct kirin_pcie {
> +	enum pcie_kirin_phy_type	type;
> +
>  	struct dw_pcie	*pci;
>  	struct phy	*phy;
>  	void __iomem	*apb_base;
> -	void		*phy_priv;	/* Needed for Kirin 960 PHY */
> +	void		*phy_priv;	/* only for PCIE_KIRIN_INTERNAL_PHY */
>  };
>  
>  /*
> @@ -476,8 +485,63 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
>  	.host_init = kirin_pcie_host_init,
>  };
>  
> +static int kirin_pcie_power_on(struct platform_device *pdev,
> +			       struct kirin_pcie *kirin_pcie)
> +{
> +	struct device *dev = &pdev->dev;
> +	int ret;
> +
> +	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) {
> +		ret = hi3660_pcie_phy_init(pdev, kirin_pcie);
> +		if (ret)
> +			return ret;
> +
> +		return hi3660_pcie_phy_power_on(kirin_pcie);
> +	}
> +
> +	kirin_pcie->phy = devm_of_phy_get(dev, dev->of_node, NULL);
> +	if (IS_ERR(kirin_pcie->phy))
> +		return PTR_ERR(kirin_pcie->phy);
> +
> +	ret = phy_init(kirin_pcie->phy);
> +	if (ret)
> +		goto err;
> +
> +	ret = phy_power_on(kirin_pcie->phy);
> +	if (ret)
> +		goto err;
> +
> +	return 0;
> +err:
> +	phy_exit(kirin_pcie->phy);
> +	return ret;
> +}
> +
> +static int __exit kirin_pcie_remove(struct platform_device *pdev)
> +{
> +	struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
> +
> +	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
> +		return 0;
> +
> +	phy_power_off(kirin_pcie->phy);
> +	phy_exit(kirin_pcie->phy);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id kirin_pcie_match[] = {
> +	{
> +		.compatible = "hisilicon,kirin960-pcie",
> +		.data = (void *)PCIE_KIRIN_INTERNAL_PHY
> +	},

Where is PCIE_KIRIN_EXTERNAL_PHY used?

Thanks,
Kishon

> +	{},
> +};
> +
>  static int kirin_pcie_probe(struct platform_device *pdev)
>  {
> +	enum pcie_kirin_phy_type phy_type;
> +	const struct of_device_id *of_id;
>  	struct device *dev = &pdev->dev;
>  	struct kirin_pcie *kirin_pcie;
>  	struct dw_pcie *pci;
> @@ -488,6 +552,14 @@ static int kirin_pcie_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> +	of_id = of_match_device(kirin_pcie_match, dev);
> +	if (!of_id) {
> +		dev_err(dev, "OF data missing\n");
> +		return -EINVAL;
> +	}
> +
> +	phy_type = (long)of_id->data;
> +
>  	kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL);
>  	if (!kirin_pcie)
>  		return -ENOMEM;
> @@ -500,31 +572,24 @@ static int kirin_pcie_probe(struct platform_device *pdev)
>  	pci->ops = &kirin_dw_pcie_ops;
>  	pci->pp.ops = &kirin_pcie_host_ops;
>  	kirin_pcie->pci = pci;
> -
> -	ret = hi3660_pcie_phy_init(pdev, kirin_pcie);
> -	if (ret)
> -		return ret;
> +	kirin_pcie->type = phy_type;
>  
>  	ret = kirin_pcie_get_resource(kirin_pcie, pdev);
>  	if (ret)
>  		return ret;
>  
> -	ret = hi3660_pcie_phy_power_on(kirin_pcie);
> -	if (ret)
> -		return ret;
> -
>  	platform_set_drvdata(pdev, kirin_pcie);
>  
> +	ret = kirin_pcie_power_on(pdev, kirin_pcie);
> +	if (ret)
> +		return ret;
> +
>  	return dw_pcie_host_init(&pci->pp);
>  }
>  
> -static const struct of_device_id kirin_pcie_match[] = {
> -	{ .compatible = "hisilicon,kirin960-pcie" },
> -	{},
> -};
> -
>  static struct platform_driver kirin_pcie_driver = {
>  	.probe			= kirin_pcie_probe,
> +	.remove	        	= __exit_p(kirin_pcie_remove),
>  	.driver			= {
>  		.name			= "kirin-pcie",
>  		.of_match_table		= kirin_pcie_match,
>
Mauro Carvalho Chehab Oct. 25, 2021, 8:52 a.m. UTC | #2 
Hi Kishon,

Em Mon, 25 Oct 2021 13:44:57 +0530
Kishon Vijay Abraham I <kishon@ti.com> escreveu:

> Hi Mauro,

> > +
> > +static const struct of_device_id kirin_pcie_match[] = {
> > +	{
> > +		.compatible = "hisilicon,kirin960-pcie",
> > +		.data = (void *)PCIE_KIRIN_INTERNAL_PHY
> > +	},  
> 
> Where is PCIE_KIRIN_EXTERNAL_PHY used?

See:
	[PATCH v15 06/13] PCI: kirin: Add Kirin 970 compatible

	https://lore.kernel.org/all/ac8c730c0300b90d96bdaaf387d458d8949241a9.1634812676.git.mchehab+huawei@kernel.org/

Basically, Kirin 970 (and any other devices that would use the same
driver) should also use PCIE_KIRIN_EXTERNAL_PHY and place the PHY 
driver inside drivers/phy, instead of hardcoding it at the driver.

The Kirin 970 PHY driver was already merged at linux-next:

	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/phy/hisilicon/phy-hi3670-pcie.c

Regards,
Mauro
Kishon Vijay Abraham I Oct. 25, 2021, 8:56 a.m. UTC | #3 
Hi Mauro,

On 25/10/21 2:22 pm, Mauro Carvalho Chehab wrote:
> Hi Kishon,
> 
> Em Mon, 25 Oct 2021 13:44:57 +0530
> Kishon Vijay Abraham I <kishon@ti.com> escreveu:
> 
>> Hi Mauro,
> 
>>> +
>>> +static const struct of_device_id kirin_pcie_match[] = {
>>> +	{
>>> +		.compatible = "hisilicon,kirin960-pcie",
>>> +		.data = (void *)PCIE_KIRIN_INTERNAL_PHY
>>> +	},  
>>
>> Where is PCIE_KIRIN_EXTERNAL_PHY used?
> 
> See:
> 	[PATCH v15 06/13] PCI: kirin: Add Kirin 970 compatible
> 
> 	https://lore.kernel.org/all/ac8c730c0300b90d96bdaaf387d458d8949241a9.1634812676.git.mchehab+huawei@kernel.org/
> 
> Basically, Kirin 970 (and any other devices that would use the same
> driver) should also use PCIE_KIRIN_EXTERNAL_PHY and place the PHY 
> driver inside drivers/phy, instead of hardcoding it at the driver.
> 
> The Kirin 970 PHY driver was already merged at linux-next:
> 
> 	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/phy/hisilicon/phy-hi3670-pcie.c

Thanks for clarifying.


Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>


Regards,
Kishon
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index b4063a3434df..91a7c096bf8f 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -8,16 +8,18 @@ 
  * Author: Xiaowei Song <songxiaowei@huawei.com>
  */
 
-#include <linux/compiler.h>
 #include <linux/clk.h>
+#include <linux/compiler.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/of_pci.h>
+#include <linux/phy/phy.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/platform_device.h>
@@ -50,11 +52,18 @@ 
 #define PCIE_DEBOUNCE_PARAM	0xF0F400
 #define PCIE_OE_BYPASS		(0x3 << 28)
 
+enum pcie_kirin_phy_type {
+	PCIE_KIRIN_INTERNAL_PHY,
+	PCIE_KIRIN_EXTERNAL_PHY
+};
+
 struct kirin_pcie {
+	enum pcie_kirin_phy_type	type;
+
 	struct dw_pcie	*pci;
 	struct phy	*phy;
 	void __iomem	*apb_base;
-	void		*phy_priv;	/* Needed for Kirin 960 PHY */
+	void		*phy_priv;	/* only for PCIE_KIRIN_INTERNAL_PHY */
 };
 
 /*
@@ -476,8 +485,63 @@  static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
+static int kirin_pcie_power_on(struct platform_device *pdev,
+			       struct kirin_pcie *kirin_pcie)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) {
+		ret = hi3660_pcie_phy_init(pdev, kirin_pcie);
+		if (ret)
+			return ret;
+
+		return hi3660_pcie_phy_power_on(kirin_pcie);
+	}
+
+	kirin_pcie->phy = devm_of_phy_get(dev, dev->of_node, NULL);
+	if (IS_ERR(kirin_pcie->phy))
+		return PTR_ERR(kirin_pcie->phy);
+
+	ret = phy_init(kirin_pcie->phy);
+	if (ret)
+		goto err;
+
+	ret = phy_power_on(kirin_pcie->phy);
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	phy_exit(kirin_pcie->phy);
+	return ret;
+}
+
+static int __exit kirin_pcie_remove(struct platform_device *pdev)
+{
+	struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
+
+	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
+		return 0;
+
+	phy_power_off(kirin_pcie->phy);
+	phy_exit(kirin_pcie->phy);
+
+	return 0;
+}
+
+static const struct of_device_id kirin_pcie_match[] = {
+	{
+		.compatible = "hisilicon,kirin960-pcie",
+		.data = (void *)PCIE_KIRIN_INTERNAL_PHY
+	},
+	{},
+};
+
 static int kirin_pcie_probe(struct platform_device *pdev)
 {
+	enum pcie_kirin_phy_type phy_type;
+	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
 	struct kirin_pcie *kirin_pcie;
 	struct dw_pcie *pci;
@@ -488,6 +552,14 @@  static int kirin_pcie_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	of_id = of_match_device(kirin_pcie_match, dev);
+	if (!of_id) {
+		dev_err(dev, "OF data missing\n");
+		return -EINVAL;
+	}
+
+	phy_type = (long)of_id->data;
+
 	kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL);
 	if (!kirin_pcie)
 		return -ENOMEM;
@@ -500,31 +572,24 @@  static int kirin_pcie_probe(struct platform_device *pdev)
 	pci->ops = &kirin_dw_pcie_ops;
 	pci->pp.ops = &kirin_pcie_host_ops;
 	kirin_pcie->pci = pci;
-
-	ret = hi3660_pcie_phy_init(pdev, kirin_pcie);
-	if (ret)
-		return ret;
+	kirin_pcie->type = phy_type;
 
 	ret = kirin_pcie_get_resource(kirin_pcie, pdev);
 	if (ret)
 		return ret;
 
-	ret = hi3660_pcie_phy_power_on(kirin_pcie);
-	if (ret)
-		return ret;
-
 	platform_set_drvdata(pdev, kirin_pcie);
 
+	ret = kirin_pcie_power_on(pdev, kirin_pcie);
+	if (ret)
+		return ret;
+
 	return dw_pcie_host_init(&pci->pp);
 }
 
-static const struct of_device_id kirin_pcie_match[] = {
-	{ .compatible = "hisilicon,kirin960-pcie" },
-	{},
-};
-
 static struct platform_driver kirin_pcie_driver = {
 	.probe			= kirin_pcie_probe,
+	.remove	        	= __exit_p(kirin_pcie_remove),
 	.driver			= {
 		.name			= "kirin-pcie",
 		.of_match_table		= kirin_pcie_match,