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Subject[PATCH 2/2] usb: chipidea: imx: set power polarity
Date
This patch adds support to set the power line polarity for i.MX6q/dl.

To let the USB controller control the power it may be necessary to configure
the polarity of the power line. So far the polarity was configured
by Bootloader or alternatively the power line was muxed as gpio and
driven by a regulator.

Signed-off-by: Philipp Puschmann <philipp.puschmann@emlix.com>
---
drivers/usb/chipidea/ci_hdrc_imx.c | 3 +++
drivers/usb/chipidea/ci_hdrc_imx.h | 1 +
drivers/usb/chipidea/usbmisc_imx.c | 4 ++++
3 files changed, 8 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index e81de9ca8729..32dc120680fa 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -152,6 +152,9 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
dev_warn(dev, "No over current polarity defined\n");
}

+ if (of_find_property(np, "power-active-high", NULL))
+ data->pwr_pol = 1;
+
if (of_find_property(np, "external-vbus-divider", NULL))
data->evdo = 1;

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
index 7cc53e2ce564..c842e03f8767 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.h
+++ b/drivers/usb/chipidea/ci_hdrc_imx.h
@@ -18,6 +18,7 @@ struct imx_usbmisc_data {
/* true if dt specifies polarity */
unsigned int oc_pol_configured:1;

+ unsigned int pwr_pol:1; /* power polarity */
unsigned int evdo:1; /* set external vbus divider option */
unsigned int ulpi:1; /* connected to an ULPI phy */
unsigned int hsic:1; /* HSIC controlller */
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 097ffbca0bd9..13e52632aece 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -63,6 +63,7 @@
#define MX6_BM_NON_BURST_SETTING BIT(1)
#define MX6_BM_OVER_CUR_DIS BIT(7)
#define MX6_BM_OVER_CUR_POLARITY BIT(8)
+#define MX6_BM_PWR_POLARITY BIT(9)
#define MX6_BM_WAKEUP_ENABLE BIT(10)
#define MX6_BM_UTMI_ON_CLOCK BIT(13)
#define MX6_BM_ID_WAKEUP BIT(16)
@@ -383,6 +384,9 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
else if (data->oc_pol_configured)
reg &= ~MX6_BM_OVER_CUR_POLARITY;
}
+ /* If the polarity is not set keep it as setup by the bootlader */
+ if (data->pwr_polarity == 1)
+ reg |= MX6_BM_PWR_POLARITY;
writel(reg, usbmisc->base + data->index * 4);

/* SoC non-burst setting */
--
2.20.1
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