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From: Rosen Penev <rosenp@gmail.com>
To: linux-gpio@vger.kernel.org
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	Linus Walleij <linusw@kernel.org>,
	Bartosz Golaszewski <brgl@kernel.org>,
	linuxppc-dev@lists.ozlabs.org (open list:LINUX FOR POWERPC
	(32-BIT AND 64-BIT)), linux-kernel@vger.kernel.org (open list)
Subject: [PATCHv2 6/8] gpio: ppc44x: drop PPC-specific IO helpers
Date: Mon,  3 Aug 2026 15:35:37 -0700	[thread overview]
Message-ID: <20260803223539.86303-7-rosenp@gmail.com> (raw)
In-Reply-To: <20260803223539.86303-1-rosenp@gmail.com>

Replace PPC-specific clrbits32()/setbits32() with local helpers using
ioread32be()/iowrite32be() which are equivalent on PPC since commit
894fa235eb4c ("powerpc: inline iomap accessors").

Add COMPILE_TEST as a result to increase compile coverage.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/gpio/Kconfig       |  2 +-
 drivers/gpio/gpio-ppc44x.c | 40 ++++++++++++++++++++++++++------------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 15fd5874f4ea..0e021af4e81e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -595,7 +595,7 @@ config GPIO_POLARFIRE_SOC
 
 config GPIO_PPC44X
 	tristate "PPC44x GPIO support"
-	depends on 44x
+	depends on 44x || COMPILE_TEST
 	select GPIO_GENERIC
 	help
 	  Enable gpiolib support for ppc440 based boards.
diff --git a/drivers/gpio/gpio-ppc44x.c b/drivers/gpio/gpio-ppc44x.c
index d9048452162a..fd543fbb959a 100644
--- a/drivers/gpio/gpio-ppc44x.c
+++ b/drivers/gpio/gpio-ppc44x.c
@@ -48,6 +48,22 @@ struct ppc44x_gpio_chip {
 	void __iomem *regs;
 };
 
+static inline void ppc44x_clrbits32(void __iomem *addr, u32 mask)
+{
+	u32 val = ioread32be(addr);
+
+	val &= ~mask;
+	iowrite32be(val, addr);
+}
+
+static inline void ppc44x_setbits32(void __iomem *addr, u32 mask)
+{
+	u32 val = ioread32be(addr);
+
+	val |= mask;
+	iowrite32be(val, addr);
+}
+
 /*
  * GPIO LIB API implementation for GPIOs
  *
@@ -77,19 +93,19 @@ static int ppc44x_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 	guard(gpio_generic_lock_irqsave)(gen_gc);
 
 	/* Disable open-drain function */
-	clrbits32(&regs->odr, GPIO_MASK(gpio));
+	ppc44x_clrbits32(&regs->odr, GPIO_MASK(gpio));
 
 	/* Float the pin */
-	clrbits32(&regs->tcr, GPIO_MASK(gpio));
+	ppc44x_clrbits32(&regs->tcr, GPIO_MASK(gpio));
 	gen_gc->sdir &= ~GPIO_MASK(gpio);
 
 	/* Bits 0-15 use TSRL/OSRL, bits 16-31 use TSRH/OSRH */
 	if (gpio < 16) {
-		clrbits32(&regs->osrl, GPIO_MASK2(gpio));
-		clrbits32(&regs->tsrl, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->osrl, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->tsrl, GPIO_MASK2(gpio));
 	} else {
-		clrbits32(&regs->osrh, GPIO_MASK2(gpio));
-		clrbits32(&regs->tsrh, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->osrh, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->tsrh, GPIO_MASK2(gpio));
 	}
 
 	return 0;
@@ -108,19 +124,19 @@ ppc44x_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 	__ppc44x_gpio_set(gc, gpio, val);
 
 	/* Disable open-drain function */
-	clrbits32(&regs->odr, GPIO_MASK(gpio));
+	ppc44x_clrbits32(&regs->odr, GPIO_MASK(gpio));
 
 	/* Drive the pin */
-	setbits32(&regs->tcr, GPIO_MASK(gpio));
+	ppc44x_setbits32(&regs->tcr, GPIO_MASK(gpio));
 	gen_gc->sdir |= GPIO_MASK(gpio);
 
 	/* Bits 0-15 use TSRL, bits 16-31 use TSRH */
 	if (gpio < 16) {
-		clrbits32(&regs->osrl, GPIO_MASK2(gpio));
-		clrbits32(&regs->tsrl, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->osrl, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->tsrl, GPIO_MASK2(gpio));
 	} else {
-		clrbits32(&regs->osrh, GPIO_MASK2(gpio));
-		clrbits32(&regs->tsrh, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->osrh, GPIO_MASK2(gpio));
+		ppc44x_clrbits32(&regs->tsrh, GPIO_MASK2(gpio));
 	}
 
 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
-- 
2.55.0


  parent reply	other threads:[~2026-08-03 22:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-03 22:35 [PATCHv2 0/8] gpio: move ppc4xx driver to drivers/gpio and modernize Rosen Penev
2026-08-03 22:35 ` [PATCHv2 1/8] gpio: move ppc4xx gpio driver from arch/powerpc to drivers/gpio Rosen Penev
2026-08-03 22:35 ` [PATCHv2 2/8] gpio: ppc44x: update all 4xx to 44x Rosen Penev
2026-08-03 22:35 ` [PATCHv2 3/8] gpio: ppc44x: Use module platform driver helper for GPIO Rosen Penev
2026-08-03 22:35 ` [PATCHv2 4/8] gpio: ppc44x: Use platform resource helper for GPIO MMIO Rosen Penev
2026-08-03 22:35 ` [PATCHv2 5/8] gpio: ppc44x: Convert GPIO to generic MMIO Rosen Penev
2026-08-03 22:35 ` Rosen Penev [this message]
2026-08-03 22:35 ` [PATCHv2 7/8] gpio: ppc44x: fix undefined behavior in GPIO_MASK2 macro Rosen Penev
2026-08-03 22:35 ` [PATCHv2 8/8] gpio: ppc44x: use dev_name() for chip label Rosen Penev
2026-08-06 22:15 ` [PATCHv2 0/8] gpio: move ppc4xx driver to drivers/gpio and modernize Linus Walleij
2026-08-07  3:54   ` Madhavan Srinivasan
2026-08-11  4:53 ` Madhavan Srinivasan

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