linux-kernel - [PATCH 8/8] Input: olpc_apsp: allocate the GPIOs used

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Message-Id: <20180910112654.42061-9-lkundrak@v3.sk>
Date:   Mon, 10 Sep 2018 13:26:54 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     linux-kernel@...r.kernel.org
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH 8/8] Input: olpc_apsp: allocate the GPIOs used

Take the GPIO lines are used by the SP. The driver doesn't touch the
lines -- this is done to disallow anything else from fiddling with
them because that would confuse the SP firmware.

Also, the lines are now nicely visible in /sys/kernel/debug/gpio.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/input/serio/olpc_apsp.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/input/serio/olpc_apsp.c b/drivers/input/serio/olpc_apsp.c
index fe9e19014e70..287759c5f36d 100644
--- a/drivers/input/serio/olpc_apsp.c
+++ b/drivers/input/serio/olpc_apsp.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
+#include <linux/gpio/consumer.h>
 
 /*
  * The OLPC XO-1.75 and XO-4 laptops do not have a hardware PS/2 controller.
@@ -76,6 +77,8 @@ struct olpc_apsp {
 	struct serio *padio;
 	void __iomem *base;
 	struct clk *clk;
+	struct gpio_desc *clk_gpio;
+	struct gpio_desc *data_gpio;
 	int open_count;
 	int irq;
 };
@@ -211,6 +214,16 @@ static int olpc_apsp_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);
 
+	priv->clk_gpio = devm_gpiod_get_optional(&pdev->dev, "clk",
+							GPIOD_ASIS);
+	if (IS_ERR(priv->clk_gpio))
+		return PTR_ERR(priv->clk_gpio);
+
+	priv->data_gpio = devm_gpiod_get_optional(&pdev->dev, "data",
+							GPIOD_ASIS);
+	if (IS_ERR(priv->data_gpio))
+		return PTR_ERR(priv->data_gpio);
+
 	/* KEYBOARD */
 	kb_serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 	if (!kb_serio)
-- 
2.17.1