* [v3] usb: uhci: Add clk support to uhci-platform
@ 2018-01-12 22:39 Benjamin Herrenschmidt
0 siblings, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2018-01-12 22:39 UTC (permalink / raw)
To: Alan Stern; +Cc: linux-usb, Greg KH
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>
---
v3. Fix tab vs. spaces and probe error path
v2. Don't forget to git add latest changes :-) This adds the
part where we turn the clock off when removing the driver.
drivers/usb/host/uhci-hcd.h | 3 +++
drivers/usb/host/uhci-platform.c | 24 ++++++++++++++++++++++--
2 files changed, 25 insertions(+), 2 deletions(-)
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
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..0d86ad244922 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 */
@@ -119,6 +119,21 @@ 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;
+ }
+ if (uhci->clk) {
+ 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;
@@ -127,6 +142,8 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
return 0;
err_rmr:
+ if (uhci->clk)
+ clk_disable_unprepare(uhci->clk);
usb_put_hcd(hcd);
return ret;
@@ -135,7 +152,10 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
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);
+ if (uhci->clk)
+ clk_disable_unprepare(uhci->clk);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [v3] usb: uhci: Add clk support to uhci-platform
@ 2018-01-13 3:35 Alan Stern
0 siblings, 0 replies; 3+ messages in thread
From: Alan Stern @ 2018-01-13 3:35 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linux-usb, Greg KH
On Sat, 13 Jan 2018, Benjamin Herrenschmidt wrote:
> 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>
> ---
>
> v3. Fix tab vs. spaces and probe error path
>
> v2. Don't forget to git add latest changes :-) This adds the
> part where we turn the clock off when removing the driver.
>
> drivers/usb/host/uhci-hcd.h | 3 +++
> drivers/usb/host/uhci-platform.c | 24 ++++++++++++++++++++++--
> 2 files changed, 25 insertions(+), 2 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..0d86ad244922 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);
> -
Any particular reason for moving this line up?
> uhci->regs = hcd->regs;
>
> /* Grab some things from the device-tree */
> @@ -119,6 +119,21 @@ 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;
> + }
> + if (uhci->clk) {
> + 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;
> @@ -127,6 +142,8 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
> return 0;
>
> err_rmr:
> + if (uhci->clk)
> + clk_disable_unprepare(uhci->clk);
You don't actually need the test here or below. Both clk_disable and
clk_unprepare test for IS_ERR_OR_NULL.
Anyway, this all looks okay. If you want to submit a v4, you can add
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Alan Stern
> usb_put_hcd(hcd);
>
> return ret;
> @@ -135,7 +152,10 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
> 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);
>
> + if (uhci->clk)
> + clk_disable_unprepare(uhci->clk);
> usb_remove_hcd(hcd);
> usb_put_hcd(hcd);
---
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 3+ messages in thread
* [v3] usb: uhci: Add clk support to uhci-platform
@ 2018-01-13 7:21 Benjamin Herrenschmidt
0 siblings, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2018-01-13 7:21 UTC (permalink / raw)
To: Alan Stern; +Cc: linux-usb, Greg KH
On Fri, 2018-01-12 at 22:35 -0500, Alan Stern wrote:
> On Sat, 13 Jan 2018, Benjamin Herrenschmidt wrote:
>
> > 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>
> > ---
> >
> > v3. Fix tab vs. spaces and probe error path
> >
> > v2. Don't forget to git add latest changes :-) This adds the
> > part where we turn the clock off when removing the driver.
>
> >
> > drivers/usb/host/uhci-hcd.h | 3 +++
> > drivers/usb/host/uhci-platform.c | 24 ++++++++++++++++++++++--
> > 2 files changed, 25 insertions(+), 2 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..0d86ad244922 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);
> > -
>
> Any particular reason for moving this line up?
Yes, otherwise you can goto the error path without uhci initialized
>
> > uhci->regs = hcd->regs;
> >
> > /* Grab some things from the device-tree */
> > @@ -119,6 +119,21 @@ 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;
> > + }
> > + if (uhci->clk) {
> > + 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;
> > @@ -127,6 +142,8 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
> > return 0;
> >
> > err_rmr:
> > + if (uhci->clk)
> > + clk_disable_unprepare(uhci->clk);
>
> You don't actually need the test here or below. Both clk_disable and
> clk_unprepare test for IS_ERR_OR_NULL.
Ah ok, it won't hurt tho, but I can do a v4 later or tomorrow.
> Anyway, this all looks okay. If you want to submit a v4, you can add
Thanks!
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
>
> Alan Stern
>
> > usb_put_hcd(hcd);
> >
> > return ret;
> > @@ -135,7 +152,10 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
> > 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);
> >
> > + if (uhci->clk)
> > + clk_disable_unprepare(uhci->clk);
> > usb_remove_hcd(hcd);
> > usb_put_hcd(hcd);
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
---
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-01-13 7:21 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-01-13 7:21 [v3] usb: uhci: Add clk support to uhci-platform Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2018-01-13 3:35 Alan Stern
2018-01-12 22:39 Benjamin Herrenschmidt
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).