On 14.02.2018 18:16, Gregory CLEMENT wrote:
On Armada 7K/8K we need to explicitly enable the register clock. This
clock is optional because not all the SoCs using this IP need it but at
least for Armada 7K/8K it is actually mandatory.
The change was done at xhci-plat level and not at a xhci-mvebu.c because,
it is expected that other SoC would have this kind of constraint.
The binding documentation is updating accordingly.
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/usb-xhci.txt | 5 +++-
drivers/usb/host/xhci-plat.c | 33 ++++++++++++++++++----
drivers/usb/host/xhci.h | 3 +-
3 files changed, 33 insertions(+), 8 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index e2ea59bbca93..e4b14511f4f8 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -27,7 +27,10 @@ Required properties:
- interrupts: one XHCI interrupt should be described here.
Optional properties:
- - clocks: reference to a clock
+ - clocks: reference to the clocks
+ - clock-names: mandatory if there is a second clock, in this case
+ the name must be "core" for the first clock and "reg" for the
+ second one
- usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
- usb3-lpm-capable: determines if platform is USB3 LPM capable
- quirk-broken-port-ped: set if the controller has broken port disable mechanism
Would be good to get a Ack or review by Rob Herring for the above
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 79afaac57ef6..fd0c399013a2 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -157,6 +157,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
struct resource *res;
struct usb_hcd *hcd;
struct clk *clk;
+ struct clk *reg_clk;
int ret;
int irq;
@@ -226,17 +227,27 @@ static int xhci_plat_probe(struct platform_device *pdev)
hcd->rsrc_len = resource_size(res);
/*
- * Not all platforms have a clk so it is not an error if the
- * clock does not exists.
+ * Not all platforms have clks so it is not an error if the
+ * clock do not exist.
*/
+ reg_clk = devm_clk_get(&pdev->dev, "reg");
+ if (!IS_ERR(reg_clk)) {
+ ret = clk_prepare_enable(reg_clk);
+ if (ret)
+ goto put_hcd;
+ } else if (PTR_ERR(reg_clk) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto put_hcd;
+ }
+
clk = devm_clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
ret = clk_prepare_enable(clk);
if (ret)
- goto put_hcd;
+ goto disable_reg_clk;
} else if (PTR_ERR(clk) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
- goto put_hcd;
+ goto disable_reg_clk;
}
xhci = hcd_to_xhci(hcd);
@@ -252,6 +263,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
device_wakeup_enable(hcd->self.controller);
xhci->clk = clk;
+ xhci->reg_clk = reg_clk;
xhci->main_hcd = hcd;
xhci->shared_hcd = __usb_create_
hcd(driver, sysdev, &pdev->dev,
dev_name(&pdev->dev), hcd);
@@ -321,6 +333,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
disable_clk:
clk_disable_unprepare(clk);
+disable_reg_clk:
+ clk_disable_unprepare(reg_clk);
+
put_hcd:
usb_put_hcd(hcd);
@@ -336,6 +351,7 @@ static int xhci_plat_remove(struct platform_device *dev)
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct clk *clk = xhci->clk;
+ struct clk *reg_clk = xhci->reg_clk;
xhci->xhc_state |= XHCI_STATE_REMOVING;
@@ -346,6 +362,7 @@ static int xhci_plat_remove(struct platform_device *dev)
usb_put_hcd(xhci->shared_hcd);
clk_disable_unprepare(clk);
+ clk_disable_unprepare(reg_clk);
usb_put_hcd(hcd);
pm_runtime_set_suspended(&dev->dev);
@@ -370,8 +387,10 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
*/
ret = xhci_suspend(xhci, device_may_wakeup(dev));
- if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk))
+ if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk)) {
clk_disable_unprepare(xhci->clk);
+ clk_disable_unprepare(xhci->reg_clk);
+ }
return ret;
}
@@ -382,8 +401,10 @@ static int __maybe_unused xhci_plat_resume(struct device *dev)
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ret;
- if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk))
+ if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk)) {
+ clk_prepare_enable(xhci->reg_clk);
clk_prepare_enable(xhci->clk);
+ }
ret = xhci_priv_resume_quirk(hcd);
if (ret)
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 96099a245c69..9884aaba1b40 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1726,8 +1726,9 @@ struct xhci_hcd {
int page_shift;
/* msi-x vectors */
int msix_count;
- /* optional clock */
+ /* optional clocks */
struct clk *clk;
+ struct clk *reg_clk;
/* data structures */
struct xhci_device_context_array *dcbaa;
struct xhci_ring *cmd_ring;
Looks good to me, I'll queue it up if the devicetree bindings looks ok for Rob Herring
-Mathias
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