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Date: Wed, 17 Sep 2014 21:04:13 +0900
From: Jingoo Han <jg1.han@...sung.com>
To: 'Vivek Gautam' <gautam.vivek@...sung.com>,
linux-usb@...r.kernel.org
Cc: linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
gregkh@...uxfoundation.org, stern@...land.harvard.edu,
kgene.kim@...sung.com, 'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v3 1/2] usb: host: ehci-exynos: Remove unnecessary usb-phy
support
On Wednesday, September 17, 2014 8:18 PM, Vivek Gautam wrote:
>
> Now that we have completely moved from older USB-PHY drivers
> to newer GENERIC-PHY drivers for PHYs available with USB controllers
> on Exynos series of SoCs, we can remove the support for the same
> in our host drivers too.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
Acked-by: Jingoo Han <jg1.han@...sung.com>
Best regards,
Jingoo Han
> ---
> drivers/usb/host/ehci-exynos.c | 81 ++++++++++++----------------------------
> 1 file changed, 23 insertions(+), 58 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index 2eed9a4..99c5f5f 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -21,11 +21,8 @@
> #include <linux/of_gpio.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> -#include <linux/usb/phy.h>
> -#include <linux/usb/samsung_usb_phy.h>
> #include <linux/usb.h>
> #include <linux/usb/hcd.h>
> -#include <linux/usb/otg.h>
>
> #include "ehci.h"
>
> @@ -47,9 +44,7 @@ static struct hc_driver __read_mostly exynos_ehci_hc_driver;
>
> struct exynos_ehci_hcd {
> struct clk *clk;
> - struct usb_phy *phy;
> - struct usb_otg *otg;
> - struct phy *phy_g[PHY_NUMBER];
> + struct phy *phy[PHY_NUMBER];
> };
>
> #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
> @@ -59,49 +54,39 @@ static int exynos_ehci_get_phy(struct device *dev,
> {
> struct device_node *child;
> struct phy *phy;
> - int phy_number;
> - int ret = 0;
> + int phy_num;
> + int ret;
>
> for_each_available_child_of_node(dev->of_node, child) {
> - ret = of_property_read_u32(child, "reg", &phy_number);
> + ret = of_property_read_u32(child, "reg", &phy_num);
> if (ret) {
> dev_err(dev, "Failed to parse device tree\n");
> of_node_put(child);
> return ret;
> }
>
> - if (phy_number >= PHY_NUMBER) {
> + if (phy_num >= PHY_NUMBER) {
> dev_err(dev, "Invalid number of PHYs\n");
> of_node_put(child);
> return -EINVAL;
> }
>
> - phy = devm_of_phy_get(dev, child, NULL);
> + exynos_ehci->phy[phy_num] = devm_of_phy_get(dev, child, NULL);
> + phy = exynos_ehci->phy[phy_num];
> of_node_put(child);
> - if (IS_ERR(phy))
> - /* Lets fallback to older USB-PHYs */
> - goto usb_phy_old;
> - exynos_ehci->phy_g[phy_number] = phy;
> - /* Make the older PHYs unavailable */
> - exynos_ehci->phy = ERR_PTR(-ENXIO);
> - }
> -
> - return 0;
> -
> -usb_phy_old:
> - exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> - if (IS_ERR(exynos_ehci->phy)) {
> - ret = PTR_ERR(exynos_ehci->phy);
> - if (ret != -ENXIO && ret != -ENODEV) {
> - dev_err(dev, "no usb2 phy configured\n");
> - return ret;
> + if (IS_ERR(phy)) {
> + ret = PTR_ERR(phy);
> + if (ret == -EPROBE_DEFER) {
> + return ret;
> + } else if (ret != -ENOSYS && ret != -ENODEV) {
> + dev_err(dev,
> + "Error retrieving usb2 phy: %d\n", ret);
> + return PTR_ERR(phy);
> + }
> }
> - dev_dbg(dev, "Failed to get usb2 phy\n");
> - } else {
> - exynos_ehci->otg = exynos_ehci->phy->otg;
> }
>
> - return ret;
> + return 0;
> }
>
> static int exynos_ehci_phy_enable(struct device *dev)
> @@ -111,16 +96,13 @@ static int exynos_ehci_phy_enable(struct device *dev)
> int i;
> int ret = 0;
>
> - if (!IS_ERR(exynos_ehci->phy))
> - return usb_phy_init(exynos_ehci->phy);
> -
> for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - ret = phy_power_on(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + ret = phy_power_on(exynos_ehci->phy[i]);
> if (ret)
> for (i--; i >= 0; i--)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - phy_power_off(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + phy_power_off(exynos_ehci->phy[i]);
>
> return ret;
> }
> @@ -131,14 +113,9 @@ static void exynos_ehci_phy_disable(struct device *dev)
> struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
> int i;
>
> - if (!IS_ERR(exynos_ehci->phy)) {
> - usb_phy_shutdown(exynos_ehci->phy);
> - return;
> - }
> -
> for (i = 0; i < PHY_NUMBER; i++)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - phy_power_off(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + phy_power_off(exynos_ehci->phy[i]);
> }
>
> static void exynos_setup_vbus_gpio(struct device *dev)
> @@ -231,9 +208,6 @@ skip_phy:
> goto fail_io;
> }
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> err = exynos_ehci_phy_enable(&pdev->dev);
> if (err) {
> dev_err(&pdev->dev, "Failed to enable USB phy\n");
> @@ -273,9 +247,6 @@ static int exynos_ehci_remove(struct platform_device *pdev)
>
> usb_remove_hcd(hcd);
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> exynos_ehci_phy_disable(&pdev->dev);
>
> clk_disable_unprepare(exynos_ehci->clk);
> @@ -298,9 +269,6 @@ static int exynos_ehci_suspend(struct device *dev)
> if (rc)
> return rc;
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> exynos_ehci_phy_disable(dev);
>
> clk_disable_unprepare(exynos_ehci->clk);
> @@ -316,9 +284,6 @@ static int exynos_ehci_resume(struct device *dev)
>
> clk_prepare_enable(exynos_ehci->clk);
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> ret = exynos_ehci_phy_enable(dev);
> if (ret) {
> dev_err(dev, "Failed to enable USB phy\n");
> --
> 1.7.10.4
--
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