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SubjectRe: [PATCH v2 18/22] usb: chipidea: msm: Add reset controller for PHY POR bit
On Thu, Jul 07, 2016 at 03:21:09PM -0700, Stephen Boyd wrote:
> The MSM chipidea wrapper has two bits that are used to reset the
> first or second phy. Add support for these bits via the reset
> controller framework, so that phy drivers can reset their
> hardware at the right time during initialization.
>
> Cc: Peter Chen <peter.chen@nxp.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> ---
> drivers/usb/chipidea/Kconfig | 1 +
> drivers/usb/chipidea/ci_hdrc_msm.c | 45 ++++++++++++++++++++++++++++++++++++--
> 2 files changed, 44 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index 4f8c342a8865..488ecdf56bdd 100644
> --- a/drivers/usb/chipidea/Kconfig
> +++ b/drivers/usb/chipidea/Kconfig
> @@ -2,6 +2,7 @@ config USB_CHIPIDEA
> tristate "ChipIdea Highspeed Dual Role Controller"
> depends on ((USB_EHCI_HCD && USB_GADGET) || (USB_EHCI_HCD && !USB_GADGET) || (!USB_EHCI_HCD && USB_GADGET)) && HAS_DMA
> select EXTCON
> + select RESET_CONTROLLER
> help
> Say Y here if your system has a dual role high speed USB
> controller based on ChipIdea silicon IP. Currently, only the
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index da2d399acdd2..ab6a7713ee5c 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -14,6 +14,7 @@
> #include <linux/mfd/syscon.h>
> #include <linux/regmap.h>
> #include <linux/io.h>
> +#include <linux/reset-controller.h>
> #include <linux/extcon.h>
> #include <linux/of.h>
>
> @@ -31,8 +32,10 @@
> #define HSPHY_SESS_VLD_CTRL BIT(25)
>
> /* Vendor base starts at 0x200 beyond CI base */
> +#define HS_PHY_CTRL 0x0040
> #define HS_PHY_SEC_CTRL 0x0078
> #define HS_PHY_DIG_CLAMP_N BIT(16)
> +#define HS_PHY_POR_ASSERT BIT(0)
>
> struct ci_hdrc_msm {
> struct platform_device *ci;
> @@ -40,11 +43,38 @@ struct ci_hdrc_msm {
> struct clk *iface_clk;
> struct clk *fs_clk;
> struct ci_hdrc_platform_data pdata;
> + struct reset_controller_dev rcdev;
> bool secondary_phy;
> bool hsic;
> void __iomem *base;
> };
>
> +static int
> +ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
> +{
> + struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
> + void __iomem *addr = ci_msm->base;
> + u32 val;
> +
> + if (id)
> + addr += HS_PHY_SEC_CTRL;
> + else
> + addr += HS_PHY_CTRL;
> +
> + val = readl_relaxed(addr);
> + val |= HS_PHY_POR_ASSERT;
> + writel(val, addr);
> + udelay(12);

Does this delay is reference manual defines or experienced value?
Do you need to comment it?

Peter
> + val &= ~HS_PHY_POR_ASSERT;
> + writel(val, addr);
> +
> + return 0;
> +}
> +
> +static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
> + .reset = ci_hdrc_msm_por_reset,
> +};
> +
> static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
> {
> struct device *dev = ci->dev->parent;
> @@ -186,10 +216,18 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
> if (!ci->base)
> return -ENOMEM;
>
> - ret = clk_prepare_enable(ci->fs_clk);
> + ci->rcdev.owner = THIS_MODULE;
> + ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
> + ci->rcdev.of_node = pdev->dev.of_node;
> + ci->rcdev.nr_resets = 2;
> + ret = reset_controller_register(&ci->rcdev);
> if (ret)
> return ret;
>
> + ret = clk_prepare_enable(ci->fs_clk);
> + if (ret)
> + goto err_fs;
> +
> reset_control_assert(reset);
> usleep_range(10000, 12000);
> reset_control_deassert(reset);
> @@ -198,7 +236,7 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>
> ret = clk_prepare_enable(ci->core_clk);
> if (ret)
> - return ret;
> + goto err_fs;
>
> ret = clk_prepare_enable(ci->iface_clk);
> if (ret)
> @@ -236,6 +274,8 @@ err_mux:
> clk_disable_unprepare(ci->iface_clk);
> err_iface:
> clk_disable_unprepare(ci->core_clk);
> +err_fs:
> + reset_controller_unregister(&ci->rcdev);
> return ret;
> }
>
> @@ -247,6 +287,7 @@ static int ci_hdrc_msm_remove(struct platform_device *pdev)
> ci_hdrc_remove_device(ci->ci);
> clk_disable_unprepare(ci->iface_clk);
> clk_disable_unprepare(ci->core_clk);
> + reset_controller_unregister(&ci->rcdev);
>
> return 0;
> }
> --
> 2.9.0.rc2.8.ga28705d
>
> --
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--

Best Regards,
Peter Chen

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