linux-kernel - [PATCH 05/10] ARM: spitz: Use software nodes to describe SPI CS lines

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Date: Fri, 28 Jun 2024 11:08:45 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Haojian Zhuang <haojian.zhuang@...il.com>,
	Daniel Mack <daniel@...que.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	soc@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] ARM: spitz: Use software nodes to describe SPI CS lines

From: Linus Walleij <linus.walleij@...aro.org>

Convert the Spitz to use software nodes for specifying SPI CS. Because
the SPI core can figure out the number of chipselects from the number
of GPIO handles specified in properties, setting "num-cs" property is
no longer needed.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 arch/arm/mach-pxa/pxa27x.c |  1 +
 arch/arm/mach-pxa/spitz.c  | 21 ++++++++++-----------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index b135b9ef665c..f8382477d629 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -341,6 +341,7 @@ static int __init pxa27x_init(void)
 		register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 
 		if (!of_have_populated_dt()) {
+			software_node_register(&pxa2xx_gpiochip_node);
 			pxa2xx_set_dmac_info(&pxa27x_dma_pdata);
 			ret = platform_add_devices(devices,
 						   ARRAY_SIZE(devices));
diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index b14eb2a54f80..504d04bb2df7 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -14,6 +14,7 @@
 #include <linux/gpio_keys.h>
 #include <linux/gpio.h>
 #include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
 #include <linux/leds.h>
 #include <linux/i2c.h>
 #include <linux/platform_data/i2c-pxa.h>
@@ -28,6 +29,7 @@
 #include <linux/input/matrix_keypad.h>
 #include <linux/regulator/machine.h>
 #include <linux/io.h>
+#include <linux/property.h>
 #include <linux/reboot.h>
 #include <linux/memblock.h>
 
@@ -128,7 +130,6 @@ static unsigned long spitz_pin_config[] __initdata = {
 	GPIO1_GPIO | WAKEUP_ON_EDGE_FALL,	/* SPITZ_GPIO_RESET */
 };
 
-
 /******************************************************************************
  * Scoop GPIO expander
  ******************************************************************************/
@@ -565,18 +566,17 @@ static struct spi_board_info spitz_spi_devices[] = {
 	},
 };
 
-static struct gpiod_lookup_table spitz_spi_gpio_table = {
-	.dev_id = "spi2",
-	.table = {
-		GPIO_LOOKUP_IDX("gpio-pxa", SPITZ_GPIO_ADS7846_CS, "cs", 0, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("gpio-pxa", SPITZ_GPIO_LCDCON_CS, "cs", 1, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("gpio-pxa", SPITZ_GPIO_MAX1111_CS, "cs", 2, GPIO_ACTIVE_LOW),
-		{ },
-	},
+static const struct software_node_ref_args spitz_spi_gpio_refs[] = {
+	SOFTWARE_NODE_REFERENCE(&pxa2xx_gpiochip_node, SPITZ_GPIO_ADS7846_CS,
+				GPIO_ACTIVE_LOW),
+	SOFTWARE_NODE_REFERENCE(&pxa2xx_gpiochip_node, SPITZ_GPIO_LCDCON_CS,
+				GPIO_ACTIVE_LOW),
+	SOFTWARE_NODE_REFERENCE(&pxa2xx_gpiochip_node, SPITZ_GPIO_MAX1111_CS,
+				GPIO_ACTIVE_LOW),
 };
 
 static const struct property_entry spitz_spi_properties[] = {
-	PROPERTY_ENTRY_U32("num-cs", 3),
+	PROPERTY_ENTRY_REF_ARRAY("gpios", spitz_spi_gpio_refs),
 	{ }
 };
 
@@ -598,7 +598,6 @@ static void __init spitz_spi_init(void)
 		gpiod_add_lookup_table(&spitz_lcdcon_gpio_table);
 
 	gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
-	gpiod_add_lookup_table(&spitz_spi_gpio_table);
 
 	pd = platform_device_register_full(&spitz_spi_device_info);
 	err = PTR_ERR_OR_ZERO(pd);
-- 
2.45.2.803.g4e1b14247a-goog