diff options
| author |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-01-16 20:53:14 +1100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-17 15:08:56 +0100 |
| commit | 26c502701c5287cd826b8a62358187f4b8941363 (patch) | |
| tree | aa22bf62aa4918c1651b34cc7148b04ee439147b /drivers/usb | |
| parent | usb: uas: unconditionally bring back host after reset (diff) | |
| download | linux-dev-26c502701c5287cd826b8a62358187f4b8941363.tar.xz linux-dev-26c502701c5287cd826b8a62358187f4b8941363.zip | |
usb: uhci: Add clk support to uhci-platform
The Aspeed SoCs use uhci-platform. With the new dynamic clock
control framework, the corresponding IP block clock must be
properly enabled.
This is a simplified variant of what ehci-platform does, it
looks for *one* clock attached to the device, and if it's
there, enables it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.h | 3 | ||||
| -rw-r--r-- | drivers/usb/host/uhci-platform.c | 23 |
2 files changed, 23 insertions, 3 deletions
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h index f1cc47292a59..7f9f33c8c232 100644 --- a/drivers/usb/host/uhci-hcd.h +++ b/drivers/usb/host/uhci-hcd.h @@ -4,6 +4,7 @@ #include <linux/list.h> #include <linux/usb.h> +#include <linux/clk.h> #define usb_packetid(pipe) (usb_pipein(pipe) ? USB_PID_IN : USB_PID_OUT) #define PIPE_DEVEP_MASK 0x0007ff00 @@ -447,6 +448,8 @@ struct uhci_hcd { int total_load; /* Sum of array values */ short load[MAX_PHASE]; /* Periodic allocations */ + struct clk *clk; /* (optional) clock source */ + /* Reset host controller */ void (*reset_hc) (struct uhci_hcd *uhci); int (*check_and_reset_hc) (struct uhci_hcd *uhci); diff --git a/drivers/usb/host/uhci-platform.c b/drivers/usb/host/uhci-platform.c index 6cb16d4b2257..89700e26fb29 100644 --- a/drivers/usb/host/uhci-platform.c +++ b/drivers/usb/host/uhci-platform.c @@ -89,6 +89,8 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev) if (!hcd) return -ENOMEM; + uhci = hcd_to_uhci(hcd); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); hcd->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(hcd->regs)) { @@ -98,8 +100,6 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev) hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); - uhci = hcd_to_uhci(hcd); - uhci->regs = hcd->regs; /* Grab some things from the device-tree */ @@ -119,13 +119,28 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev) "Enabled Aspeed implementation workarounds\n"); } } + + /* Get and enable clock if any specified */ + uhci->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(uhci->clk)) { + ret = PTR_ERR(uhci->clk); + goto err_rmr; + } + ret = clk_prepare_enable(uhci->clk); + if (ret) { + dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret); + goto err_rmr; + } + ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); if (ret) - goto err_rmr; + goto err_clk; device_wakeup_enable(hcd->self.controller); return 0; +err_clk: + clk_disable_unprepare(uhci->clk); err_rmr: usb_put_hcd(hcd); @@ -135,7 +150,9 @@ err_rmr: static int uhci_hcd_platform_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct uhci_hcd *uhci = hcd_to_uhci(hcd); + clk_disable_unprepare(uhci->clk); usb_remove_hcd(hcd); usb_put_hcd(hcd); |