pinctrl: sunxi: Add support for the Allwinner A523

The Allwinner A523 contains pins in 10 out of the 11 possible pin banks;
it just skips port A.
Use the newly introduced DT based pinctrl driver to describe just the
generic pinctrl properties, so advertise the number of pins per bank
and the interrupt capabilities. The actual function/mux assignment is
taken from the devicetree.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/20250306235827.4895-8-andre.przywara@arm.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 60 insertions, 0 deletions

diff --git a/drivers/pinctrl/sunxi/Kconfig b/drivers/pinctrl/sunxi/Kconfig
index a78fdbbdfc0c..0cbe46668365 100644
--- a/drivers/pinctrl/sunxi/Kconfig
+++ b/drivers/pinctrl/sunxi/Kconfig
@@ -131,4 +131,9 @@ config PINCTRL_SUN50I_H616_R
 	default ARM64 && ARCH_SUNXI
 	select PINCTRL_SUNXI
 
+config PINCTRL_SUN55I_A523
+	bool "Support for the Allwinner A523 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
 endif
diff --git a/drivers/pinctrl/sunxi/Makefile b/drivers/pinctrl/sunxi/Makefile
index f5bad7a52951..4e55508ff7f7 100644
--- a/drivers/pinctrl/sunxi/Makefile
+++ b/drivers/pinctrl/sunxi/Makefile
@@ -27,5 +27,6 @@ obj-$(CONFIG_PINCTRL_SUN50I_H6)		+= pinctrl-sun50i-h6.o
 obj-$(CONFIG_PINCTRL_SUN50I_H6_R)	+= pinctrl-sun50i-h6-r.o
 obj-$(CONFIG_PINCTRL_SUN50I_H616)	+= pinctrl-sun50i-h616.o
 obj-$(CONFIG_PINCTRL_SUN50I_H616_R)	+= pinctrl-sun50i-h616-r.o
+obj-$(CONFIG_PINCTRL_SUN55I_A523)	+= pinctrl-sun55i-a523.o
 obj-$(CONFIG_PINCTRL_SUN9I_A80)		+= pinctrl-sun9i-a80.o
 obj-$(CONFIG_PINCTRL_SUN9I_A80_R)	+= pinctrl-sun9i-a80-r.o
diff --git a/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c
new file mode 100644
index 000000000000..7d2308c37d29
--- /dev/null
+++ b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Allwinner A523 SoC pinctrl driver.
+ *
+ * Copyright (C) 2023 Arm Ltd.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#include "pinctrl-sunxi.h"
+
+static const u8 a523_nr_bank_pins[SUNXI_PINCTRL_MAX_BANKS] =
+/*	  PA  PB  PC  PD  PE  PF  PG  PH  PI  PJ  PK */
+	{  0, 15, 17, 24, 16,  7, 15, 20, 17, 28, 24 };
+
+static const unsigned int a523_irq_bank_map[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+
+static const u8 a523_irq_bank_muxes[SUNXI_PINCTRL_MAX_BANKS] =
+/*	  PA  PB  PC  PD  PE  PF  PG  PH  PI  PJ  PK */
+	{  0, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14};
+
+static struct sunxi_pinctrl_desc a523_pinctrl_data = {
+	.irq_banks = ARRAY_SIZE(a523_irq_bank_map),
+	.irq_bank_map = a523_irq_bank_map,
+	.irq_read_needs_mux = true,
+	.io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_SEL,
+};
+
+static int a523_pinctrl_probe(struct platform_device *pdev)
+{
+	return sunxi_pinctrl_dt_table_init(pdev, a523_nr_bank_pins,
+					   a523_irq_bank_muxes,
+					   &a523_pinctrl_data,
+					   SUNXI_PINCTRL_NEW_REG_LAYOUT |
+					   SUNXI_PINCTRL_ELEVEN_BANKS);
+}
+
+static const struct of_device_id a523_pinctrl_match[] = {
+	{ .compatible = "allwinner,sun55i-a523-pinctrl", },
+	{}
+};
+
+static struct platform_driver a523_pinctrl_driver = {
+	.probe	= a523_pinctrl_probe,
+	.driver	= {
+		.name		= "sun55i-a523-pinctrl",
+		.of_match_table	= a523_pinctrl_match,
+	},
+};
+builtin_platform_driver(a523_pinctrl_driver);