From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2F177CCF9F8 for ; Mon, 3 Nov 2025 15:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Rf6umCTs6ByjmJaBYxnA7MT63F2QTyiiAoh4dGhmsWM=; b=CkJYRJ5kXVL1qvQPaiAW0JUdlL MUYQdjMu07n9ioVtKhCMuRG2Em8kmG5ORnZhrVm0Mlpm9THQ0ZYUtpnGNyz2Ftz8c/KvJEZUb8f1o /5cTsOqbaGjMbimAlFFgpHguyOkB/e/uGU9jRQRnpi62BB2t2WvQLHtWqRwz9kELB64pJm0B5JnQz RnUoOToMqHdtsQ/apj9+NqyTLdd9nwFM9EbrulTXQQ9duIubCO++wBjiDqtZf36A04f70Jroa4ACk 9EOEAKMzM/D7GPZprxvy3aRL6t3Khsp4lanVPOk9LepnmSV8qUt+G8YolWUM3xFm0eS+mC6DLQBTP /QhEOVtA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vFwRa-0000000A95J-3SjY; Mon, 03 Nov 2025 15:26:06 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vFwRY-0000000A94j-3CbA; Mon, 03 Nov 2025 15:26:05 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B8E27416CD; Mon, 3 Nov 2025 15:26:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6021C4CEFD; Mon, 3 Nov 2025 15:25:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762183563; bh=vTEEqBvf4uzbZw74WdV2qWj7leVepYcRsHzgRilYAj0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dR4lyfqyfIeJ3Ig5IPvfd8uQHC7OCGkNY5Ighzdr7vuELihzTMXwpe1J33wj3KKqF yXmy51zxJLjI4GwonRG1NW5zAvQittC2tg3yCjRcZMgdiNt30fumnf97uLkEaLYA+4 r6swm9vdmo8l8qyKlx6b9m3eX9FfPDwKiTLK9JjVkvYookjhlcFEBfKoOVT0WsG9+p 82keLUNdicu7twpN0Qvj8BU2ViUhie01STXSh+ioYOCdTJddR+uVE8NIufhxzLUmM/ 5GGmf0rKR9Akh31tWmPTVFX7fFXFURZ+UPi8gqlwg3/kVJsyQmz7JnBtqO5mhL3JQK 383L40wVejGiQ== Date: Mon, 3 Nov 2025 15:25:56 +0000 From: Lee Jones To: Johan Jonker Cc: Nicolas Frattaroli , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , William Breathitt Gray , kernel@collabora.com, Jonas Karlman , Alexey Charkov , linux-rockchip@lists.infradead.org, linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Subject: Re: [PATCH v3 2/5] mfd: Add Rockchip mfpwm driver Message-ID: <20251103152556.GB8064@google.com> References: <20251027-rk3576-pwm-v3-0-654a5cb1e3f8@collabora.com> <20251027-rk3576-pwm-v3-2-654a5cb1e3f8@collabora.com> <16341fe2-7d2b-45a6-a861-93950c1bbd1f@yandex.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <16341fe2-7d2b-45a6-a861-93950c1bbd1f@yandex.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251103_072604_850551_13EC2507 X-CRM114-Status: GOOD ( 55.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 28 Oct 2025, Johan Jonker wrote: > > > On 10/27/25 18:11, Nicolas Frattaroli wrote: > > With the Rockchip RK3576, the PWM IP used by Rockchip has changed > > substantially. Looking at both the downstream pwm-rockchip driver as > > well as the mainline pwm-rockchip driver made it clear that with all its > > additional features and its differences from previous IP revisions, it > > is best supported in a new driver. > > > > This brings us to the question as to what such a new driver should be. > > To me, it soon became clear that it should actually be several new > > drivers, most prominently when Uwe Kleine-König let me know that I > > should not implement the pwm subsystem's capture callback, but instead > > write a counter driver for this functionality. > > > > Combined with the other as-of-yet unimplemented functionality of this > > new IP, it became apparent that it needs to be spread across several > > subsystems. > > > > For this reason, we add a new MFD core driver, called mfpwm (short for > > "Multi-function PWM"). This "parent" driver makes sure that only one > > device function driver is using the device at a time, and is in charge > > of registering the MFD cell devices for the individual device functions > > offered by the device. > > > > An acquire/release pattern is used to guarantee that device function > > drivers don't step on each other's toes. > > > > Signed-off-by: Nicolas Frattaroli > > --- > > MAINTAINERS | 2 + > > drivers/mfd/Kconfig | 15 ++ > > drivers/mfd/Makefile | 1 + > > drivers/mfd/rockchip-mfpwm.c | 340 +++++++++++++++++++++++++++ > > include/linux/mfd/rockchip-mfpwm.h | 454 +++++++++++++++++++++++++++++++++++++ > > 5 files changed, 812 insertions(+) > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index baecabab35a2..8f3235ba825e 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -22372,6 +22372,8 @@ L: linux-rockchip@lists.infradead.org > > L: linux-pwm@vger.kernel.org > > S: Maintained > > > F: Documentation/devicetree/bindings/pwm/rockchip,rk3576-pwm.yaml > > A question not so much for Nicolas specific: > The yaml documents already have a 'maintainers' entry. > However MAINTAINERS is full yaml entries. > Could someone explain why we still need dual registration? > > maintainers: > - Nicolas Frattaroli > > > +F: drivers/soc/rockchip/mfpwm.c > > +F: include/soc/rockchip/mfpwm.h > > different file name and location? > > drivers/mfd/rockchip-mfpwm.c | 340 +++++++++++++++++++++++++++ > include/linux/mfd/rockchip-mfpwm.h | 454 +++++++++++++++++++++++++++++++++++++ > > > > > > ROCKCHIP RK3568 RANDOM NUMBER GENERATOR SUPPORT > > M: Daniel Golle > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > > index dbeac6825a10..8b3a3160fbdf 100644 > > --- a/drivers/mfd/Kconfig > > +++ b/drivers/mfd/Kconfig > > @@ -1367,6 +1367,21 @@ config MFD_RC5T583 > > Additional drivers must be enabled in order to use the > > different functionality of the device. > > > > +config MFD_ROCKCHIP_MFPWM > > + tristate "Rockchip multi-function PWM controller" > > + depends on OF > > + depends on HAS_IOMEM > > + depends on COMMON_CLK > > + select MFD_CORE > > + help > > + Some Rockchip SoCs, such as the RK3576, use a PWM controller that has > > + several different functions, such as generating PWM waveforms but also > > + counting waveforms. > > + > > + This driver manages the overall device, and selects between different > > + functionalities at runtime as needed. Drivers for them are implemented > > + in their respective subsystems. > > + > > config MFD_RK8XX > > tristate > > select MFD_CORE > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > > index e75e8045c28a..ebadbaea9e4a 100644 > > --- a/drivers/mfd/Makefile > > +++ b/drivers/mfd/Makefile > > @@ -231,6 +231,7 @@ obj-$(CONFIG_MFD_PALMAS) += palmas.o > > obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o > > obj-$(CONFIG_MFD_NTXEC) += ntxec.o > > obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o > > +obj-$(CONFIG_MFD_ROCKCHIP_MFPWM) += rockchip-mfpwm.o > > obj-$(CONFIG_MFD_RK8XX) += rk8xx-core.o > > obj-$(CONFIG_MFD_RK8XX_I2C) += rk8xx-i2c.o > > obj-$(CONFIG_MFD_RK8XX_SPI) += rk8xx-spi.o > > diff --git a/drivers/mfd/rockchip-mfpwm.c b/drivers/mfd/rockchip-mfpwm.c > > new file mode 100644 > > index 000000000000..08c2d8da41b7 > > --- /dev/null > > +++ b/drivers/mfd/rockchip-mfpwm.c > > @@ -0,0 +1,340 @@ > > +// SPDX-License-Identifier: GPL-2.0-or-later > > +/* > > + * Copyright (c) 2025 Collabora Ltd. > > + * > > + * A driver to manage all the different functionalities exposed by Rockchip's > > + * PWMv4 hardware. > > + * > > + * This driver is chiefly focused on guaranteeing non-concurrent operation > > + * between the different device functions, as well as setting the clocks. > > + * It registers the device function platform devices, e.g. PWM output or > > + * PWM capture. > > + * > > + * Authors: > > + * Nicolas Frattaroli > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +/** > > + * struct rockchip_mfpwm - private mfpwm driver instance state struct > > + * @pdev: pointer to this instance's &struct platform_device > > + * @base: pointer to the memory mapped registers of this device > > + * @pwm_clk: pointer to the PLL clock the PWM signal may be derived from > > + * @osc_clk: pointer to the fixed crystal the PWM signal may be derived from > > + * @rc_clk: pointer to the RC oscillator the PWM signal may be derived from > > + * @chosen_clk: a clk-mux of pwm_clk, osc_clk and rc_clk > > + * @pclk: pointer to the APB bus clock needed for mmio register access > > + * @active_func: pointer to the currently active device function, or %NULL if no > > + * device function is currently actively using any of the shared > > + * resources. May only be checked/modified with @state_lock held. > > + * @acquire_cnt: number of times @active_func has currently mfpwm_acquire()'d > > + * it. Must only be checked or modified while holding @state_lock. > > + * @state_lock: this lock is held while either the active device function, the > > + * enable register, or the chosen clock is being changed. > > + * @irq: the IRQ number of this device > > + */ > > +struct rockchip_mfpwm { > > + struct platform_device *pdev; > > + void __iomem *base; > > + struct clk *pwm_clk; > > + struct clk *osc_clk; > > + struct clk *rc_clk; > > + struct clk *chosen_clk; > > + struct clk *pclk; > > + struct rockchip_mfpwm_func *active_func; > > + unsigned int acquire_cnt; > > + spinlock_t state_lock; > > + int irq; > > +}; > > + > > +static atomic_t subdev_id = ATOMIC_INIT(0); > > + > > +static inline struct rockchip_mfpwm *to_rockchip_mfpwm(struct platform_device *pdev) > > +{ > > + return platform_get_drvdata(pdev); > > +} > > + > > +static int mfpwm_check_pwmf(const struct rockchip_mfpwm_func *pwmf, > > + const char *fname) > > +{ > > + struct device *dev = &pwmf->parent->pdev->dev; > > + > > + if (IS_ERR_OR_NULL(pwmf)) { > > + dev_warn(dev, "called %s with an erroneous handle, no effect\n", > > + fname); > > + return -EINVAL; > > + } > > + > > + if (IS_ERR_OR_NULL(pwmf->parent)) { > > + dev_warn(dev, "called %s with an erroneous mfpwm_func parent, no effect\n", > > + fname); > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > +__attribute__((nonnull)) > > +static int mfpwm_do_acquire(struct rockchip_mfpwm_func *pwmf) > > +{ > > + struct rockchip_mfpwm *mfpwm = pwmf->parent; > > + unsigned int cnt; > > + > > + if (mfpwm->active_func && pwmf->id != mfpwm->active_func->id) > > + return -EBUSY; > > + > > + if (!mfpwm->active_func) > > + mfpwm->active_func = pwmf; > > + > > + if (!check_add_overflow(mfpwm->acquire_cnt, 1, &cnt)) { > > + mfpwm->acquire_cnt = cnt; > > + } else { > > + dev_warn(&mfpwm->pdev->dev, "prevented acquire counter overflow in %s\n", > > + __func__); > > + return -EOVERFLOW; > > + } > > + > > + dev_dbg(&mfpwm->pdev->dev, "%d acquired mfpwm, acquires now at %u\n", > > + pwmf->id, mfpwm->acquire_cnt); > > + > > + return clk_enable(mfpwm->pclk); > > +} > > + > > +int mfpwm_acquire(struct rockchip_mfpwm_func *pwmf) > > +{ > > + struct rockchip_mfpwm *mfpwm; > > + unsigned long flags; > > + int ret = 0; > > + > > + ret = mfpwm_check_pwmf(pwmf, "mfpwm_acquire"); > > + if (ret) > > + return ret; > > + > > + mfpwm = pwmf->parent; > > + dev_dbg(&mfpwm->pdev->dev, "%d is attempting to acquire\n", pwmf->id); > > + > > + if (!spin_trylock_irqsave(&mfpwm->state_lock, flags)) > > + return -EBUSY; > > + > > + ret = mfpwm_do_acquire(pwmf); > > + > > + spin_unlock_irqrestore(&mfpwm->state_lock, flags); > > + > > + return ret; > > +} > > +EXPORT_SYMBOL_NS_GPL(mfpwm_acquire, "ROCKCHIP_MFPWM"); > > + > > +__attribute__((nonnull)) > > +static void mfpwm_do_release(const struct rockchip_mfpwm_func *pwmf) > > +{ > > + struct rockchip_mfpwm *mfpwm = pwmf->parent; > > + > > + if (!mfpwm->active_func) > > + return; > > + > > + if (mfpwm->active_func->id != pwmf->id) > > + return; > > + > > + /* > > + * No need to check_sub_overflow here, !mfpwm->active_func above catches > > + * this type of problem already. > > + */ > > + mfpwm->acquire_cnt--; > > + > > + if (!mfpwm->acquire_cnt) > > + mfpwm->active_func = NULL; > > + > > + clk_disable(mfpwm->pclk); > > +} > > + > > +void mfpwm_release(const struct rockchip_mfpwm_func *pwmf) > > +{ > > + struct rockchip_mfpwm *mfpwm; > > + unsigned long flags; > > + > > + if (mfpwm_check_pwmf(pwmf, "mfpwm_release")) > > + return; > > + > > + mfpwm = pwmf->parent; > > + > > + spin_lock_irqsave(&mfpwm->state_lock, flags); > > + mfpwm_do_release(pwmf); > > + dev_dbg(&mfpwm->pdev->dev, "%d released mfpwm, acquires now at %u\n", > > + pwmf->id, mfpwm->acquire_cnt); > > + spin_unlock_irqrestore(&mfpwm->state_lock, flags); > > +} > > +EXPORT_SYMBOL_NS_GPL(mfpwm_release, "ROCKCHIP_MFPWM"); > > + > > +/** > > + * mfpwm_register_subdev - register a single mfpwm_func > > + * @mfpwm: pointer to the parent &struct rockchip_mfpwm > > + * @name: sub-device name string > > + * > > + * Allocate a single &struct mfpwm_func, fill its members with appropriate data, > > + * and register a new mfd cell. > > + * > > + * Returns: 0 on success, negative errno on error > > + */ > > +static int mfpwm_register_subdev(struct rockchip_mfpwm *mfpwm, > > + const char *name) > > +{ > > + struct rockchip_mfpwm_func *func; > > + struct mfd_cell cell = {}; > > + > > + func = devm_kzalloc(&mfpwm->pdev->dev, sizeof(*func), GFP_KERNEL); > > + if (IS_ERR(func)) > > + return PTR_ERR(func); > > + func->irq = mfpwm->irq; > > + func->parent = mfpwm; > > + func->id = atomic_inc_return(&subdev_id); > > + func->base = mfpwm->base; > > + func->core = mfpwm->chosen_clk; > > + cell.name = name; > > + cell.platform_data = func; > > + cell.pdata_size = sizeof(*func); > > + // cell.ignore_resource_conflicts = true; > > + // cell.resources = mfpwm->pdev->resource; > > + // cell.num_resources = mfpwm->pdev->num_resources; > > + > > + return devm_mfd_add_devices(&mfpwm->pdev->dev, func->id, &cell, 1, NULL, > > + 0, NULL); > > +} > > + > > +static int mfpwm_register_subdevs(struct rockchip_mfpwm *mfpwm) > > +{ > > + int ret; > > + > > > + ret = mfpwm_register_subdev(mfpwm, "pwm-rockchip-v4"); > > Not sure who came up with this name? > In case we need to filter wouldn't be easier to order it just like the bindings: manufacture '-' function Please snip your replies in the future. -- Lee Jones [李琼斯] From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 363CDCCFA06 for ; Mon, 3 Nov 2025 15:26:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; 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sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vFwRY-0000000A94j-3CbA; Mon, 03 Nov 2025 15:26:05 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B8E27416CD; Mon, 3 Nov 2025 15:26:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6021C4CEFD; Mon, 3 Nov 2025 15:25:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762183563; bh=vTEEqBvf4uzbZw74WdV2qWj7leVepYcRsHzgRilYAj0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dR4lyfqyfIeJ3Ig5IPvfd8uQHC7OCGkNY5Ighzdr7vuELihzTMXwpe1J33wj3KKqF yXmy51zxJLjI4GwonRG1NW5zAvQittC2tg3yCjRcZMgdiNt30fumnf97uLkEaLYA+4 r6swm9vdmo8l8qyKlx6b9m3eX9FfPDwKiTLK9JjVkvYookjhlcFEBfKoOVT0WsG9+p 82keLUNdicu7twpN0Qvj8BU2ViUhie01STXSh+ioYOCdTJddR+uVE8NIufhxzLUmM/ 5GGmf0rKR9Akh31tWmPTVFX7fFXFURZ+UPi8gqlwg3/kVJsyQmz7JnBtqO5mhL3JQK 383L40wVejGiQ== Date: Mon, 3 Nov 2025 15:25:56 +0000 From: Lee Jones To: Johan Jonker Cc: Nicolas Frattaroli , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , William Breathitt Gray , kernel@collabora.com, Jonas Karlman , Alexey Charkov , linux-rockchip@lists.infradead.org, linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Subject: Re: [PATCH v3 2/5] mfd: Add Rockchip mfpwm driver Message-ID: <20251103152556.GB8064@google.com> References: <20251027-rk3576-pwm-v3-0-654a5cb1e3f8@collabora.com> <20251027-rk3576-pwm-v3-2-654a5cb1e3f8@collabora.com> <16341fe2-7d2b-45a6-a861-93950c1bbd1f@yandex.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <16341fe2-7d2b-45a6-a861-93950c1bbd1f@yandex.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251103_072604_850551_13EC2507 X-CRM114-Status: GOOD ( 55.42 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org T24gVHVlLCAyOCBPY3QgMjAyNSwgSm9oYW4gSm9ua2VyIHdyb3RlOgoKPiAKPiAKPiBPbiAxMC8y Ny8yNSAxODoxMSwgTmljb2xhcyBGcmF0dGFyb2xpIHdyb3RlOgo+ID4gV2l0aCB0aGUgUm9ja2No aXAgUkszNTc2LCB0aGUgUFdNIElQIHVzZWQgYnkgUm9ja2NoaXAgaGFzIGNoYW5nZWQKPiA+IHN1 YnN0YW50aWFsbHkuIExvb2tpbmcgYXQgYm90aCB0aGUgZG93bnN0cmVhbSBwd20tcm9ja2NoaXAg ZHJpdmVyIGFzCj4gPiB3ZWxsIGFzIHRoZSBtYWlubGluZSBwd20tcm9ja2NoaXAgZHJpdmVyIG1h ZGUgaXQgY2xlYXIgdGhhdCB3aXRoIGFsbCBpdHMKPiA+IGFkZGl0aW9uYWwgZmVhdHVyZXMgYW5k 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