linux-kernel - [PATCH v3] gpio: mockup: Allow probing from device tree

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Message-ID: <20201028085748.17388-1-vincent.whitchurch@axis.com>
Date:   Wed, 28 Oct 2020 09:57:48 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Bamvor Jian Zhang <bamv2005@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
CC:     <kernel@...s.com>, <devicetree@...r.kernel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] gpio: mockup: Allow probing from device tree

Allow the mockup driver to be probed via the device tree without any
module parameters, allowing it to be used to configure and test higher
level drivers like the leds-gpio driver and corresponding userspace
before actual hardware is available.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---

Notes:
    v3:
    - Keep includes sorted alphabetically
    - Drop CONFIG_OF ifdefs
    
    v2:
    - Remove most of the added code, since the latest driver doesn't need it.
    - Drop DT binding document, since Rob Herring was OK with not documenting this:
      https://lore.kernel.org/linux-devicetree/5baa1ae6.1c69fb81.847f2.3ab1@mx.google.com/

 drivers/gpio/gpio-mockup.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 67ed4f238d43..ca87c590ef3f 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -16,6 +16,7 @@
 #include <linux/irq_sim.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
@@ -460,9 +461,16 @@ static int gpio_mockup_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id gpio_mockup_of_match[] = {
+	{ .compatible = "gpio-mockup", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, gpio_mockup_of_match);
+
 static struct platform_driver gpio_mockup_driver = {
 	.driver = {
 		.name = "gpio-mockup",
+		.of_match_table = of_match_ptr(gpio_mockup_of_match),
 	},
 	.probe = gpio_mockup_probe,
 };
@@ -556,8 +564,7 @@ static int __init gpio_mockup_init(void)
 {
 	int i, num_chips, err;
 
-	if ((gpio_mockup_num_ranges < 2) ||
-	    (gpio_mockup_num_ranges % 2) ||
+	if ((gpio_mockup_num_ranges % 2) ||
 	    (gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
 		return -EINVAL;
 
-- 
2.28.0