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Date:   Thu, 28 Oct 2021 00:17:02 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Lee Jones <lee.jones@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Russell King <linux@...linux.org.uk>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Joshua Thompson <funaho@...ai.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Tony Lindgren <tony@...mide.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Pavel Machek <pavel@....cz>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-sh@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-acpi@...r.kernel.org,
        linux-omap@...r.kernel.org, openbmc@...ts.ozlabs.org,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH v2 32/45] mfd: retu: Use devm_register_simple_power_off_handler()

Use devm_register_simple_power_off_handler() that replaces global
pm_power_off variable and allows to register multiple power-off handlers.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/mfd/retu-mfd.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
index c748fd29a220..d18f05c1f095 100644
--- a/drivers/mfd/retu-mfd.c
+++ b/drivers/mfd/retu-mfd.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/reboot.h>
 #include <linux/regmap.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/retu.h>
@@ -81,9 +82,6 @@ static struct regmap_irq_chip retu_irq_chip = {
 	.ack_base	= RETU_REG_IDR,
 };
 
-/* Retu device registered for the power off. */
-static struct retu_dev *retu_pm_power_off;
-
 static const struct resource tahvo_usb_res[] = {
 	{
 		.name	= "tahvo-usb",
@@ -165,12 +163,12 @@ int retu_write(struct retu_dev *rdev, u8 reg, u16 data)
 }
 EXPORT_SYMBOL_GPL(retu_write);
 
-static void retu_power_off(void)
+static void retu_power_off(void *data)
 {
-	struct retu_dev *rdev = retu_pm_power_off;
+	struct retu_dev *rdev = data;
 	int reg;
 
-	mutex_lock(&retu_pm_power_off->mutex);
+	mutex_lock(&rdev->mutex);
 
 	/* Ignore power button state */
 	regmap_read(rdev->regmap, RETU_REG_CC1, &reg);
@@ -183,7 +181,7 @@ static void retu_power_off(void)
 	for (;;)
 		cpu_relax();
 
-	mutex_unlock(&retu_pm_power_off->mutex);
+	mutex_unlock(&rdev->mutex);
 }
 
 static int retu_regmap_read(void *context, const void *reg, size_t reg_size,
@@ -261,6 +259,17 @@ static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		 (ret & RETU_REG_ASICR_VILMA) ? rdat->companion_name : "",
 		 (ret >> 4) & 0x7, ret & 0xf);
 
+	if (i2c->addr == 1) {
+		ret = devm_register_simple_power_off_handler(&i2c->dev,
+							     retu_power_off,
+							     rdev);
+		if (ret) {
+			dev_err(rdev->dev,
+				"could not register power-off handler: %d\n", ret);
+			return ret;
+		}
+	}
+
 	/* Mask all interrupts. */
 	ret = retu_write(rdev, rdat->irq_chip->mask_base, 0xffff);
 	if (ret < 0)
@@ -279,10 +288,6 @@ static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		return ret;
 	}
 
-	if (i2c->addr == 1 && !pm_power_off) {
-		retu_pm_power_off = rdev;
-		pm_power_off	  = retu_power_off;
-	}
 
 	return 0;
 }
@@ -291,10 +296,6 @@ static int retu_remove(struct i2c_client *i2c)
 {
 	struct retu_dev *rdev = i2c_get_clientdata(i2c);
 
-	if (retu_pm_power_off == rdev) {
-		pm_power_off	  = NULL;
-		retu_pm_power_off = NULL;
-	}
 	mfd_remove_devices(rdev->dev);
 	regmap_del_irq_chip(i2c->irq, rdev->irq_data);
 
-- 
2.33.1

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