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usb: chipidea: Add dynamic pinctrl selection 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/usb/chipidea/core.c
View File

@ -53,6 +53,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
@ -723,6 +724,24 @@ static int ci_get_platdata(struct device *dev,
else
cable->connected = false;
}
platdata->pctl = devm_pinctrl_get(dev);
if (!IS_ERR(platdata->pctl)) {
struct pinctrl_state *p;
p = pinctrl_lookup_state(platdata->pctl, "default");
if (!IS_ERR(p))
platdata->pins_default = p;
p = pinctrl_lookup_state(platdata->pctl, "host");
if (!IS_ERR(p))
platdata->pins_host = p;
p = pinctrl_lookup_state(platdata->pctl, "device");
if (!IS_ERR(p))
platdata->pins_device = p;
}
return 0;
}

9
drivers/usb/chipidea/host.c
View File

@ -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);
}

9
drivers/usb/chipidea/udc.c
View File

@ -15,6 +15,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg-fsm.h>
@ -1965,6 +1966,10 @@ void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
static int udc_id_switch_for_device(struct ci_hdrc *ci)
{
if (ci->platdata->pins_device)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_device);
if (ci->is_otg)
/* Clear and enable BSV irq */
hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
@ -1983,6 +1988,10 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci)
hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
ci->vbus_active = 0;
if (ci->platdata->pins_device && ci->platdata->pins_default)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_default);
}
/**

6
include/linux/usb/chipidea.h
View File

@ -77,6 +77,12 @@ struct ci_hdrc_platform_data {
struct ci_hdrc_cable vbus_extcon;
struct ci_hdrc_cable id_extcon;
u32 phy_clkgate_delay_us;
/* pins */
struct pinctrl *pctl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_host;
struct pinctrl_state *pins_device;
};
/* Default offset of capability registers */