Hi Thierry,
On Tue, Mar 08, 2016 at 04:48:14PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> The current XUSB pad controller bindings are insufficient to describe
> PHY devices attached to USB controllers. New bindings have been created
> to overcome these restrictions. As a side-effect each root port now is
> assigned a set of PHY devices, one for each lane associated with the
> root port. This has the benefit of allowing fine-grained control of the
> power management for each lane.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
There are two open questions here (mine and Stephen's). I'll drop
this and look for a v4.
> ---
> Changes in v3:
> - cache result of check for new PHY bindings usage (Stephen Warren)
>
> Changes in v2:
> - rework commit message to more accurately describe this change
>
> drivers/pci/host/pci-tegra.c | 151 ++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 135 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
> index 75c55265ca73..3b59e3162dfa 100644
> --- a/drivers/pci/host/pci-tegra.c
> +++ b/drivers/pci/host/pci-tegra.c
> @@ -290,6 +290,7 @@ struct tegra_pcie {
> struct reset_control *afi_rst;
> struct reset_control *pcie_xrst;
>
> + bool legacy_phy;
> struct phy *phy;
>
> struct tegra_msi msi;
> @@ -307,11 +308,14 @@ struct tegra_pcie {
>
> struct tegra_pcie_port {
> struct tegra_pcie *pcie;
> + struct device_node *np;
> struct list_head list;
> struct resource regs;
> void __iomem *base;
> unsigned int index;
> unsigned int lanes;
> +
> + struct phy **phys;
> };
>
> struct tegra_pcie_bus {
> @@ -844,6 +848,24 @@ static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
> return 0;
> }
>
> +static int tegra_pcie_port_phy_power_on(struct tegra_pcie_port *port)
> +{
> + struct device *dev = port->pcie->dev;
> + unsigned int i;
> + int err;
> +
> + for (i = 0; i < port->lanes; i++) {
> + err = phy_power_on(port->phys[i]);
> + if (err < 0) {
> + dev_err(dev, "failed to power on PHY#%u: %d\n", i,
> + err);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
> {
> const struct tegra_pcie_soc_data *soc = pcie->soc_data;
> @@ -883,14 +905,24 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
> afi_writel(pcie, value, AFI_FUSE);
> }
>
> - if (!pcie->phy)
> - err = tegra_pcie_phy_enable(pcie);
> - else
> - err = phy_power_on(pcie->phy);
> + if (!pcie->legacy_phy) {
> + list_for_each_entry(port, &pcie->ports, list) {
> + err = tegra_pcie_port_phy_power_on(port);
> + if (err < 0) {
> + dev_err(pcie->dev,
> + "failed to power on PCIe port: %d\n",
> + err);
> + return err;
> + }
> + }
> + } else {
> + if (!pcie->phy)
> + err = tegra_pcie_phy_enable(pcie);
> + else
> + err = phy_power_on(pcie->phy);
>
> - if (err < 0) {
> - dev_err(pcie->dev, "failed to power on PHY: %d\n", err);
> - return err;
> + if (err < 0)
> + dev_err(pcie->dev, "failed to power on PHY: %d\n", err);
> }
>
> /* take the PCIe interface module out of reset */
> @@ -1033,6 +1065,99 @@ static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
> return 0;
> }
>
> +static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie)
> +{
> + int err;
> +
> + pcie->phy = devm_phy_optional_get(pcie->dev, "pcie");
> + if (IS_ERR(pcie->phy)) {
> + err = PTR_ERR(pcie->phy);
> + dev_err(pcie->dev, "failed to get PHY: %d\n", err);
> + return err;
> + }
> +
> + err = phy_init(pcie->phy);
> + if (err < 0) {
> + dev_err(pcie->dev, "failed to initialize PHY: %d\n", err);
> + return err;
> + }
> +
> + pcie->legacy_phy = true;
> +
> + return 0;
> +}
> +
> +static struct phy *devm_of_phy_optional_get_index(struct device *dev,
> + struct device_node *np,
> + const char *consumer,
> + unsigned int index)
> +{
> + struct phy *phy;
> + char *name;
> +
> + name = kasprintf(GFP_KERNEL, "%s-%u", consumer, index);
> + if (!name)
> + return ERR_PTR(-ENOMEM);
> +
> + phy = devm_of_phy_get(dev, np, name);
> + kfree(name);
> +
> + if (IS_ERR(phy) && PTR_ERR(phy) == -ENODEV)
> + phy = NULL;
> +
> + return phy;
> +}
> +
> +static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port)
> +{
> + struct device *dev = port->pcie->dev;
> + struct phy *phy;
> + unsigned int i;
> + int err;
> +
> + port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL);
> + if (!port->phys)
> + return -ENOMEM;
> +
> + for (i = 0; i < port->lanes; i++) {
> + phy = devm_of_phy_optional_get_index(dev, port->np, "pcie", i);
> + if (IS_ERR(phy)) {
> + dev_err(dev, "failed to get PHY#%u: %ld\n", i,
> + PTR_ERR(phy));
> + return PTR_ERR(phy);
> + }
> +
> + err = phy_init(phy);
> + if (err < 0) {
> + dev_err(dev, "failed to initialize PHY#%u: %d\n", i,
> + err);
> + return err;
> + }
> +
> + port->phys[i] = phy;
> + }
> +
> + return 0;
> +}
> +
> +static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
> +{
> + struct tegra_pcie_port *port;
> + int err;
> +
> + if (of_get_property(pcie->dev->of_node, "phys", NULL) != NULL)
> + return tegra_pcie_phys_get_legacy(pcie);
> +
> + list_for_each_entry(port, &pcie->ports, list) {
> + err = tegra_pcie_port_get_phys(port);
> + if (err < 0) {
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
> {
> struct platform_device *pdev = to_platform_device(pcie->dev);
> @@ -1051,16 +1176,9 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
> return err;
> }
>
> - pcie->phy = devm_phy_optional_get(pcie->dev, "pcie");
> - if (IS_ERR(pcie->phy)) {
> - err = PTR_ERR(pcie->phy);
> - dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
> - return err;
> - }
> -
> - err = phy_init(pcie->phy);
> + err = tegra_pcie_phys_get(pcie);
> if (err < 0) {
> - dev_err(&pdev->dev, "failed to initialize PHY: %d\n", err);
> + dev_err(&pdev->dev, "failed to get PHYs: %d\n", err);
> return err;
> }
>
> @@ -1725,6 +1843,7 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
> rp->index = index;
> rp->lanes = value;
> rp->pcie = pcie;
> + rp->np = port;
>
> rp->base = devm_ioremap_resource(pcie->dev, &rp->regs);
> if (IS_ERR(rp->base))
> --
> 2.7.1
>
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