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usb: chipidea: host: add vbus regulator control 

For boards which have board level vbus control (eg, through gpio), we
need to vbus operation according to below rules:
- For host, we need open vbus before start hcd, and close it
after remove hcd.
- For otg, the vbus needs to be on/off when usb role switches.
When the host roles begins, it opens vbus; when the host role
finishes, it closes vbus.

We put vbus operation to host as host is the only vbus user,
When we are at host mode, the vbus is on, when we are not at
host mode, vbus should be off.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Peter Chen 2013-08-14 12:44:04 +03:00 committed by Greg Kroah-Hartman
parent 1542d9c35d
commit 40ed51a4b8
1 changed files with 22 additions and 1 deletions
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23
drivers/usb/chipidea/host.c
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@ -24,6 +24,7 @@
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>
#include <linux/regulator/consumer.h>
#include "../host/ehci.h"
@ -65,9 +66,19 @@ static int host_start(struct ci_hdrc *ci)
ehci->has_hostpc = ci->hw_bank.lpm;
ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
if (ci->platdata->reg_vbus) {
ret = regulator_enable(ci->platdata->reg_vbus);
if (ret) {
dev_err(ci->dev,
"Failed to enable vbus regulator, ret=%d\n",
ret);
goto put_hcd;
}
}
ret = usb_add_hcd(hcd, 0, 0);
if (ret)
usb_put_hcd(hcd);
goto disable_reg;
else
ci->hcd = hcd;
@ -75,6 +86,14 @@ static int host_start(struct ci_hdrc *ci)
hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
return ret;
disable_reg:
regulator_disable(ci->platdata->reg_vbus);
put_hcd:
usb_put_hcd(hcd);
return ret;
}
static void host_stop(struct ci_hdrc *ci)
@ -83,6 +102,8 @@ static void host_stop(struct ci_hdrc *ci)
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
if (ci->platdata->reg_vbus)
regulator_disable(ci->platdata->reg_vbus);
}
int ci_hdrc_host_init(struct ci_hdrc *ci)