linux-kernel - Re: [PATCH v2 03/12] PCI: aardvark: Add PHY support

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Date:   Fri, 14 Dec 2018 01:47:01 +0100
From:   Marek Behun <marek.behun@....cz>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Gregory Clement <gregory.clement@...tlin.com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci@...r.kernel.org, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>
Subject: Re: [PATCH v2 03/12] PCI: aardvark: Add PHY support

Hi Miquel,
are there already patches for the A37xx comphy driver?

On Wed, 12 Dec 2018 11:21:33 +0100
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> The IP needs its PHY to be properly configured to work. While the PHY
> is usually already configured by the bootloader, we will need this
> feature when adding S2RAM support. Take care of registering and
> configuring the PHY from the driver itself.
> 
> Suggested-by: Grzegorz Jaszczyk <jaz@...ihalf.com>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/pci/controller/pci-aardvark.c | 62
> +++++++++++++++++++++++++++ 1 file changed, 62 insertions(+)
> 
> diff --git a/drivers/pci/controller/pci-aardvark.c
> b/drivers/pci/controller/pci-aardvark.c index
> 1d31d74ddab7..da695572a2ed 100644 ---
> a/drivers/pci/controller/pci-aardvark.c +++
> b/drivers/pci/controller/pci-aardvark.c @@ -17,6 +17,7 @@
>  #include <linux/pci.h>
>  #include <linux/init.h>
>  #include <linux/platform_device.h>
> +#include <linux/phy/phy.h>
>  #include <linux/of_address.h>
>  #include <linux/of_gpio.h>
>  #include <linux/of_pci.h>
> @@ -204,6 +205,7 @@ struct advk_pcie {
>  	int root_bus_nr;
>  	struct pci_bridge_emul bridge;
>  	struct gpio_desc *reset_gpio;
> +	struct phy *phy;
>  };
>  
>  static inline void advk_writel(struct advk_pcie *pcie, u32 val, u64
> reg) @@ -1025,6 +1027,62 @@ static int
> advk_pcie_setup_reset_gpio(struct advk_pcie *pcie) return 0;
>  }
>  
> +static void advk_pcie_disable_phy(struct advk_pcie *pcie)
> +{
> +	phy_power_off(pcie->phy);
> +	phy_exit(pcie->phy);
> +}
> +
> +static int advk_pcie_enable_phy(struct advk_pcie *pcie)
> +{
> +	int ret;
> +
> +	if (!pcie->phy)
> +		return 0;
> +
> +	ret = phy_init(pcie->phy);
> +	if (ret)
> +		return ret;
> +
> +	ret = phy_set_mode(pcie->phy, PHY_MODE_PCIE);
> +	if (ret) {
> +		phy_exit(pcie->phy);
> +		return ret;
> +	}
> +
> +	ret = phy_power_on(pcie->phy);
> +	if (ret) {
> +		phy_exit(pcie->phy);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int advk_pcie_setup_phy(struct advk_pcie *pcie)
> +{
> +	struct device *dev = &pcie->pdev->dev;
> +	struct device_node *node = dev->of_node;
> +	int ret = 0;
> +
> +	pcie->phy = devm_of_phy_get(dev, node, NULL);
> +	if (IS_ERR(pcie->phy) && (PTR_ERR(pcie->phy) ==
> -EPROBE_DEFER))
> +		return PTR_ERR(pcie->phy);
> +
> +	/* Old bindings miss the PHY handle */
> +	if (IS_ERR(pcie->phy)) {
> +		dev_warn(dev, "PHY unavailable (%ld)\n",
> PTR_ERR(pcie->phy));
> +		pcie->phy = NULL;
> +		return 0;
> +	}
> +
> +	ret = advk_pcie_enable_phy(pcie);
> +	if (ret)
> +		dev_err(dev, "Failed to initialize PHY (%d)\n", ret);
> +
> +	return ret;
> +}
> +
>  static int advk_pcie_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -1060,6 +1118,10 @@ static int advk_pcie_probe(struct
> platform_device *pdev) return ret;
>  	}
>  
> +	ret = advk_pcie_setup_phy(pcie);
> +	if (ret)
> +		return ret;
> +
>  	ret = advk_pcie_setup_reset_gpio(pcie);
>  	if (ret)
>  		return ret;