linux-kernel - [PATCH v5 06/10] gpio: gpio-aspeed-sgpio: Add AST2400 and AST2500 platform data.

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Date:   Tue, 8 Jun 2021 18:25:41 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     <steven_lee@...eedtech.com>, <Hongweiz@....com>,
        <ryan_chen@...eedtech.com>, <billy_tsai@...eedtech.com>
Subject: [PATCH v5 06/10] gpio: gpio-aspeed-sgpio: Add AST2400 and AST2500 platform data.

We use platform data to store GPIO pin mask and the max number of
available GPIO pins for AST2600.
Refactor driver to also add the platform data for AST2400/AST2500 and
remove unused MAX_NR_HW_SGPIO and ASPEED_SGPIO_PINS_MASK macros.

Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
---
 drivers/gpio/gpio-aspeed-sgpio.c | 34 +++++++++++---------------------
 1 file changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c
index ea20a0127748..7d0a4f6fd9d1 100644
--- a/drivers/gpio/gpio-aspeed-sgpio.c
+++ b/drivers/gpio/gpio-aspeed-sgpio.c
@@ -17,21 +17,8 @@
 #include <linux/spinlock.h>
 #include <linux/string.h>
 
-/*
- * MAX_NR_HW_GPIO represents the number of actual hardware-supported GPIOs (ie,
- * slots within the clocked serial GPIO data). Since each HW GPIO is both an
- * input and an output, we provide MAX_NR_HW_GPIO * 2 lines on our gpiochip
- * device.
- *
- * We use SGPIO_OUTPUT_OFFSET to define the split between the inputs and
- * outputs; the inputs start at line 0, the outputs start at OUTPUT_OFFSET.
- */
-#define MAX_NR_HW_SGPIO			80
-#define SGPIO_OUTPUT_OFFSET		MAX_NR_HW_SGPIO
-
 #define ASPEED_SGPIO_CTRL		0x54
 
-#define ASPEED_SGPIO_PINS_MASK		GENMASK(9, 6)
 #define ASPEED_SGPIO_CLK_DIV_MASK	GENMASK(31, 16)
 #define ASPEED_SGPIO_ENABLE		BIT(0)
 #define ASPEED_SGPIO_PINS_SHIFT		6
@@ -484,6 +471,11 @@ static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
 	return 0;
 }
 
+static const struct aspeed_sgpio_pdata ast2400_sgpio_pdata = {
+	.max_ngpios = 80,
+	.pin_mask = GENMASK(9, 6),
+};
+
 static const struct aspeed_sgpio_pdata ast2600_sgpiom_128_pdata = {
 	.max_ngpios = 128,
 	.pin_mask = GENMASK(10, 6),
@@ -495,8 +487,8 @@ static const struct aspeed_sgpio_pdata ast2600_sgpiom_80_pdata = {
 };
 
 static const struct of_device_id aspeed_sgpio_of_table[] = {
-	{ .compatible = "aspeed,ast2400-sgpio" },
-	{ .compatible = "aspeed,ast2500-sgpio" },
+	{ .compatible = "aspeed,ast2400-sgpio", .data = &ast2400_sgpio_pdata, },
+	{ .compatible = "aspeed,ast2500-sgpio", .data = &ast2400_sgpio_pdata, },
 	{ .compatible = "aspeed,ast2600-sgpiom-128", .data = &ast2600_sgpiom_128_pdata, },
 	{ .compatible = "aspeed,ast2600-sgpiom-80", .data = &ast2600_sgpiom_80_pdata, },
 	{}
@@ -521,13 +513,11 @@ static int __init aspeed_sgpio_probe(struct platform_device *pdev)
 		return PTR_ERR(gpio->base);
 
 	pdata = device_get_match_data(&pdev->dev);
-	if (pdata) {
-		gpio->max_ngpios = pdata->max_ngpios;
-		pin_mask = pdata->pin_mask;
-	} else {
-		gpio->max_ngpios = MAX_NR_HW_SGPIO;
-		pin_mask = ASPEED_SGPIO_PINS_MASK;
-	}
+	if (!pdata)
+		return -EINVAL;
+
+	gpio->max_ngpios = pdata->max_ngpios;
+	pin_mask = pdata->pin_mask;
 
 	rc = of_property_read_u32(pdev->dev.of_node, "ngpios", &nr_gpios);
 	if (rc < 0) {
-- 
2.17.1