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Sat, 12 Sep 2026 08:18:45 -0700 (PDT) From: Reza Kurniawan Date: Sat, 12 Sep 2026 22:18:11 +0700 Subject: [PATCH v2 1/2] power: supply: bq256xx: Expose VBUS state through extcon Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260912-riva-usb-v2-1-997fe0171ee5@gmail.com> References: <20260912-riva-usb-v2-0-997fe0171ee5@gmail.com> In-Reply-To: <20260912-riva-usb-v2-0-997fe0171ee5@gmail.com> To: Sebastian Reichel , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, Reza Kurniawan X-Mailer: b4 0.15.2 Useful for USB controllers needing to sense VBUS state changes. This is needed for devices like Xiaomi Redmi 5A (riva) that doesn't have its VBUS session comparator wired directly to the USB connector pin to automatically enable certain USB functions upon the presence of a USB power input. Signed-off-by: Reza Kurniawan --- drivers/power/supply/Kconfig | 1 + drivers/power/supply/bq256xx_charger.c | 96 ++++++++++++++++++++++++++++++= +--- 2 files changed, 89 insertions(+), 8 deletions(-) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index b89ef40df..ee7dc5f26 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -850,6 +850,7 @@ config CHARGER_BQ256XX tristate "TI BQ256XX battery charger driver" depends on I2C depends on GPIOLIB || COMPILE_TEST + depends on EXTCON || !EXTCON select REGMAP_I2C help Say Y to enable support for the TI BQ256XX battery chargers. The diff --git a/drivers/power/supply/bq256xx_charger.c b/drivers/power/supply/= bq256xx_charger.c index 4b1f81b1e..454bc497b 100644 --- a/drivers/power/supply/bq256xx_charger.c +++ b/drivers/power/supply/bq256xx_charger.c @@ -16,6 +16,7 @@ #include #include #include +#include =20 #define BQ256XX_MANUFACTURER "Texas Instruments" =20 @@ -209,6 +210,7 @@ enum bq256xx_id { * @client: i2c client structure * @regmap: register map structure * @dev: device structure + * @edev: extcon device registered to report vbus state changes * @charger: power supply registered for the charger * @battery: power supply registered for the battery * @lock: mutex lock structure @@ -229,6 +231,7 @@ enum bq256xx_id { struct bq256xx_device { struct i2c_client *client; struct device *dev; + struct extcon_dev *edev; struct power_supply *charger; struct power_supply *battery; struct mutex lock; @@ -1164,8 +1167,14 @@ static int bq256xx_get_charger_property(struct power= _supply *psy, return ret; } =20 -static bool bq256xx_state_changed(struct bq256xx_device *bq, - struct bq256xx_state *new_state) +enum bq256xx_state_change { + CHANGED_NONE, + CHANGED_VBUS, + CHANGED_OTHER +}; + +static enum bq256xx_state_change bq256xx_state_changed(struct bq256xx_devi= ce *bq, + struct bq256xx_state *new_state) { struct bq256xx_state old_state; =20 @@ -1173,27 +1182,92 @@ static bool bq256xx_state_changed(struct bq256xx_de= vice *bq, old_state =3D bq->state; mutex_unlock(&bq->lock); =20 - return memcmp(&old_state, new_state, sizeof(struct bq256xx_state)) !=3D 0; + if (new_state->online !=3D old_state.online) + return CHANGED_VBUS; + + if (memcmp(&old_state, new_state, sizeof(struct bq256xx_state)) !=3D 0) + return CHANGED_OTHER; + + return CHANGED_NONE; +} + +static const unsigned int bq256xx_usb_extcon_cable[] =3D { + EXTCON_USB, + EXTCON_NONE, +}; + +static void bq256xx_extcon_update(struct bq256xx_device *bq, bool online) +{ + int ret; + + if (!bq->edev) + return; + + ret =3D extcon_set_state_sync(bq->edev, EXTCON_USB, online); + if (ret) + dev_err(bq->dev, "Failed to update extcon state: %d\n", ret); +} + +static int bq256xx_extcon_init(struct bq256xx_device *bq) +{ + unsigned int charger_status_0; + int ret; + + if (!IS_REACHABLE(CONFIG_EXTCON)) { + dev_dbg(bq->dev, "Extcon support is disabled\n"); + return 0; + } + + bq->edev =3D devm_extcon_dev_allocate(bq->dev, bq256xx_usb_extcon_cable); + if (IS_ERR(bq->edev)) { + dev_err(bq->dev, "Failed to allocate extcon device\n"); + return PTR_ERR(bq->edev); + } + + ret =3D devm_extcon_dev_register(bq->dev, bq->edev); + if (ret < 0) { + dev_err(bq->dev, "Failed to register extcon device\n"); + return ret; + } + + ret =3D regmap_read(bq->regmap, BQ256XX_CHARGER_STATUS_0, + &charger_status_0); + if (ret) { + dev_err(bq->dev, "Failed to read charger status\n"); + return ret; + } + + bq256xx_extcon_update(bq, !!(charger_status_0 & BQ256XX_PG_STAT_MASK)); + + return 0; } =20 static irqreturn_t bq256xx_irq_handler_thread(int irq, void *private) { struct bq256xx_device *bq =3D private; struct bq256xx_state state; + enum bq256xx_state_change changed; int ret; =20 ret =3D bq256xx_get_state(bq, &state); if (ret < 0) goto irq_out; =20 - if (!bq256xx_state_changed(bq, &state)) + changed =3D bq256xx_state_changed(bq, &state); + switch (changed) { + case CHANGED_NONE: goto irq_out; =20 - mutex_lock(&bq->lock); - bq->state =3D state; - mutex_unlock(&bq->lock); + case CHANGED_VBUS: + bq256xx_extcon_update(bq, state.online); + fallthrough; + case CHANGED_OTHER: + mutex_lock(&bq->lock); + bq->state =3D state; + mutex_unlock(&bq->lock); =20 - power_supply_changed(bq->charger); + power_supply_changed(bq->charger); + } =20 irq_out: return IRQ_HANDLED; @@ -1743,6 +1817,12 @@ static int bq256xx_probe(struct i2c_client *client) if (!IS_ERR_OR_NULL(bq->usb3_phy)) usb_register_notifier(bq->usb3_phy, &bq->usb_nb); =20 + ret =3D bq256xx_extcon_init(bq); + if (ret) { + dev_err(dev, "Failed to register extcon device\n"); + return ret; + } + if (client->irq) { ret =3D devm_request_threaded_irq(dev, client->irq, NULL, bq256xx_irq_handler_thread, --=20 2.55.0 From nobody Fri Sep 25 12:37:38 2026 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 21E1043303F for ; 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Sat, 12 Sep 2026 08:18:51 -0700 (PDT) Received: from [127.0.0.2] ([2404:c0:701d:4e35:f53f:aaab:9e63:54e8]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d951d1056sm10635924a91.7.2026.09.12.08.18.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2026 08:18:50 -0700 (PDT) From: Reza Kurniawan Date: Sat, 12 Sep 2026 22:18:12 +0700 Subject: [PATCH v2 2/2] arm64: dts: qcom: msm8917-xiaomi-riva: Enable USB support (peripheral mode) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260912-riva-usb-v2-2-997fe0171ee5@gmail.com> References: <20260912-riva-usb-v2-0-997fe0171ee5@gmail.com> In-Reply-To: <20260912-riva-usb-v2-0-997fe0171ee5@gmail.com> To: Sebastian Reichel , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, Reza Kurniawan X-Mailer: b4 0.15.2 Enable USB node and PHY. Since VBUS is wired to the charger IC, also set extcon of the USB node to inform the USB driver of cable events emitted by the charger driver. Signed-off-by: Reza Kurniawan --- arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts b/arch/arm64/= boot/dts/qcom/msm8917-xiaomi-riva.dts index 7c323214a..c47aad978 100644 --- a/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts +++ b/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts @@ -69,7 +69,7 @@ power-monitor@55 { monitored-battery =3D <&battery>; }; =20 - charger@6b { + bq25601_charger: charger@6b { compatible =3D "ti,bq25601"; reg =3D <0x6b>; interrupts-extended =3D <&tlmm 61 IRQ_TYPE_EDGE_FALLING>; @@ -89,3 +89,18 @@ bq25601_int_default: bq25601-int-default-state { bias-pull-up; }; }; + +&usb { + dr_mode =3D "peripheral"; + extcon =3D <&bq25601_charger>; + + status =3D "okay"; +}; + +&usb_hs_phy { + vdd-supply =3D <&pm8937_l2>; + vdda1p8-supply =3D <&pm8937_l7>; + vdda3p3-supply =3D <&pm8937_l13>; + + status =3D "okay"; +}; --=20 2.55.0