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usb: dwc3: add a power supply for current control

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Currently, VBUS draw callback does no action when the
generic PHYs are used. This patch adds an additional
path to control charging current through power supply
interface.

Signed-off-by: Ray Chi <raychi@google.com>
Link: https://lore.kernel.org/r/20210222115149.3606776-2-raychi@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ray Chi 2021-02-22 19:51:48 +08:00 committed by Greg Kroah-Hartman
parent a38fd87484
commit 6f0764b5ad
2 changed files with 19 additions and 0 deletions
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15
drivers/usb/dwc3/core.c
View File

@ -1238,6 +1238,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
u8 rx_max_burst_prd;
u8 tx_thr_num_pkt_prd;
u8 tx_max_burst_prd;
const char *usb_psy_name;
int ret;
/* default to highest possible threshold */
lpm_nyet_threshold = 0xf;
@ -1263,6 +1265,13 @@ static void dwc3_get_properties(struct dwc3 *dwc)
else
dwc->sysdev = dwc->dev;
ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name);
if (ret >= 0) {
dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
if (!dwc->usb_psy)
dev_err(dev, "couldn't get usb power supply\n");
}
dwc->has_lpm_erratum = device_property_read_bool(dev,
"snps,has-lpm-erratum");
device_property_read_u8(dev, "snps,lpm-nyet-threshold",
@ -1619,6 +1628,9 @@ disable_clks:
assert_reset:
reset_control_assert(dwc->reset);
if (!dwc->usb_psy)
power_supply_put(dwc->usb_psy);
return ret;
}
@ -1641,6 +1653,9 @@ static int dwc3_remove(struct platform_device *pdev)
dwc3_free_event_buffers(dwc);
dwc3_free_scratch_buffers(dwc);
if (!dwc->usb_psy)
power_supply_put(dwc->usb_psy);
return 0;
}

4
drivers/usb/dwc3/core.h
View File

@ -30,6 +30,8 @@
#include <linux/phy/phy.h>
#include <linux/power_supply.h>
#define DWC3_MSG_MAX 500
/* Global constants */
@ -1125,6 +1127,8 @@ struct dwc3 {
struct usb_role_switch *role_sw;
enum usb_dr_mode role_switch_default_mode;
struct power_supply *usb_psy;
u32 fladj;
u32 irq_gadget;
u32 otg_irq;