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SubjectRe: [PATCH v2 2/3] usb: exynos: add support for getting PHYs from the standard dt array
On Fri, 26 Jul 2019, Marek Szyprowski wrote:

> Add the code for getting generic PHYs from standard device tree array
> from the main controller device node. This is a first step in resolving
> the conflict between Exynos EHCI/OHCI sub-nodes and generic USB device
> bindings. Later the sub-nodes currently used for assigning PHYs to root
> ports of the controller will be removed making a place for the generic
> USB device bindings nodes.
>
> Suggested-by: Måns Rullgård <mans@mansr.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---

Acked-by: Alan Stern <stern@rowland.harvard.edu>

> drivers/usb/host/ehci-exynos.c | 23 +++++++++++++++++++----
> drivers/usb/host/ohci-exynos.c | 23 +++++++++++++++++++----
> 2 files changed, 38 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index 3a29a1a8519c..01debfd03d4a 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -41,6 +41,7 @@ struct exynos_ehci_hcd {
> struct clk *clk;
> struct device_node *of_node;
> struct phy *phy[PHY_NUMBER];
> + bool legacy_phy;
> };
>
> #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
> @@ -50,10 +51,22 @@ static int exynos_ehci_get_phy(struct device *dev,
> {
> struct device_node *child;
> struct phy *phy;
> - int phy_number;
> + int phy_number, num_phys;
> int ret;
>
> /* Get PHYs for the controller */
> + num_phys = of_count_phandle_with_args(dev->of_node, "phys",
> + "#phy-cells");
> + for (phy_number = 0; phy_number < num_phys; phy_number++) {
> + phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> + exynos_ehci->phy[phy_number] = phy;
> + }
> + if (num_phys > 0)
> + return 0;
> +
> + /* Get PHYs using legacy bindings */
> for_each_available_child_of_node(dev->of_node, child) {
> ret = of_property_read_u32(child, "reg", &phy_number);
> if (ret) {
> @@ -84,6 +97,7 @@ static int exynos_ehci_get_phy(struct device *dev,
> }
> }
>
> + exynos_ehci->legacy_phy = true;
> return 0;
> }
>
> @@ -205,11 +219,12 @@ static int exynos_ehci_probe(struct platform_device *pdev)
> ehci->caps = hcd->regs;
>
> /*
> - * Workaround: reset of_node pointer to avoid conflict between Exynos
> - * EHCI port subnodes and generic USB device bindings
> + * Workaround: reset of_node pointer to avoid conflict between legacy
> + * Exynos EHCI port subnodes and generic USB device bindings
> */
> exynos_ehci->of_node = pdev->dev.of_node;
> - pdev->dev.of_node = NULL;
> + if (exynos_ehci->legacy_phy)
> + pdev->dev.of_node = NULL;
>
> /* DMA burst Enable */
> writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
> diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> index 905c6317e0c3..d5ce98e205c7 100644
> --- a/drivers/usb/host/ohci-exynos.c
> +++ b/drivers/usb/host/ohci-exynos.c
> @@ -32,6 +32,7 @@ struct exynos_ohci_hcd {
> struct clk *clk;
> struct device_node *of_node;
> struct phy *phy[PHY_NUMBER];
> + bool legacy_phy;
> };
>
> static int exynos_ohci_get_phy(struct device *dev,
> @@ -39,10 +40,22 @@ static int exynos_ohci_get_phy(struct device *dev,
> {
> struct device_node *child;
> struct phy *phy;
> - int phy_number;
> + int phy_number, num_phys;
> int ret;
>
> /* Get PHYs for the controller */
> + num_phys = of_count_phandle_with_args(dev->of_node, "phys",
> + "#phy-cells");
> + for (phy_number = 0; phy_number < num_phys; phy_number++) {
> + phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> + exynos_ohci->phy[phy_number] = phy;
> + }
> + if (num_phys > 0)
> + return 0;
> +
> + /* Get PHYs using legacy bindings */
> for_each_available_child_of_node(dev->of_node, child) {
> ret = of_property_read_u32(child, "reg", &phy_number);
> if (ret) {
> @@ -73,6 +86,7 @@ static int exynos_ohci_get_phy(struct device *dev,
> }
> }
>
> + exynos_ohci->legacy_phy = true;
> return 0;
> }
>
> @@ -172,11 +186,12 @@ static int exynos_ohci_probe(struct platform_device *pdev)
> }
>
> /*
> - * Workaround: reset of_node pointer to avoid conflict between Exynos
> - * OHCI port subnodes and generic USB device bindings
> + * Workaround: reset of_node pointer to avoid conflict between legacy
> + * Exynos OHCI port subnodes and generic USB device bindings
> */
> exynos_ohci->of_node = pdev->dev.of_node;
> - pdev->dev.of_node = NULL;
> + if (exynos_ohci->legacy_phy)
> + pdev->dev.of_node = NULL;
>
> err = usb_add_hcd(hcd, irq, IRQF_SHARED);
> if (err) {
>

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