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usb: chipidea: Add dynamic pinctrl selection

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Some hardware implementations require to configure pins differently
according to the USB role (host/device), this can be an update of the
pins routing or a simple GPIO value change.

This patch introduces new optional "host" and "device" pinctrls.
If these pinctrls are defined by the device, they are respectively
selected on host/device role start.

If a default pinctrl exist, it is restored on host/device role stop.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Loic Poulain
2018-09-04 17:18:55 +02:00
committed by Peter Chen
parent 1f06072cd2
commit 16caf1fa37
4 changed files with 43 additions and 0 deletions
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9
drivers/usb/chipidea/host.c
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@@ -13,6 +13,7 @@
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>
#include "../host/ehci.h"
@@ -153,6 +154,10 @@ static int host_start(struct ci_hdrc *ci)
}
}
if (ci->platdata->pins_host)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_host);
ret = usb_add_hcd(hcd, 0, 0);
if (ret) {
goto disable_reg;
@@ -197,6 +202,10 @@ static void host_stop(struct ci_hdrc *ci)
}
ci->hcd = NULL;
ci->otg.host = NULL;
if (ci->platdata->pins_host && ci->platdata->pins_default)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_default);
}