linux-kernel - [PATCH 2/2] mfd: ab8500-core: Add device tree support for AB8505

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Date:   Sun, 17 Nov 2019 23:10:53 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Stephan Gerhold <stephan@...hold.net>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 2/2] mfd: ab8500-core: Add device tree support for AB8505

AB8505 support was never fully converted to the device tree.
Most of the MFD cells for AB8505 lack an "of_compatible",
which prevents them from being configured through the device tree.

Align the definition of the AB8505 MFD cells with the ones for AB8500,
and add device tree compatibles. Except for GPIO and regulators the
compatibles are equal to those used for AB8500 because the hardware
does not differ much.

Finally, change db8500_prcmu_register_ab8500() to check for the AB8505
device tree node additionally, and probe it if it is found.

Cc: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
 drivers/mfd/ab8500-core.c  | 14 ++++++++++++--
 drivers/mfd/db8500-prcmu.c | 26 ++++++++++++++++++++------
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index bafc729fc434..6db7969101d6 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -718,17 +718,20 @@ static const struct mfd_cell ab8505_devs[] = {
 #ifdef CONFIG_DEBUG_FS
 	{
 		.name = "ab8500-debug",
+		.of_compatible = "stericsson,ab8500-debug",
 	},
 #endif
 	{
 		.name = "ab8500-sysctrl",
+		.of_compatible = "stericsson,ab8500-sysctrl",
 	},
 	{
 		.name = "ab8500-regulator",
+		.of_compatible = "stericsson,ab8505-regulator",
 	},
 	{
 		.name = "abx500-clk",
-		.of_compatible = "stericsson,abx500-clk",
+		.of_compatible = "stericsson,ab8500-clk",
 	},
 	{
 		.name = "ab8500-gpadc",
@@ -736,25 +739,32 @@ static const struct mfd_cell ab8505_devs[] = {
 	},
 	{
 		.name = "ab8500-rtc",
+		.of_compatible = "stericsson,ab8500-rtc",
 	},
 	{
 		.name = "ab8500-acc-det",
+		.of_compatible = "stericsson,ab8500-acc-det",
 	},
 	{
 		.name = "ab8500-poweron-key",
+		.of_compatible = "stericsson,ab8500-poweron-key",
 	},
 	{
 		.name = "ab8500-pwm",
+		.of_compatible = "stericsson,ab8500-pwm",
 		.id = 1,
 	},
 	{
 		.name = "pinctrl-ab8505",
+		.of_compatible = "stericsson,ab8505-gpio",
 	},
 	{
 		.name = "ab8500-usb",
+		.of_compatible = "stericsson,ab8500-usb",
 	},
 	{
 		.name = "ab8500-codec",
+		.of_compatible = "stericsson,ab8500-codec",
 	},
 	{
 		.name = "ab-iddet",
@@ -1276,7 +1286,7 @@ static int ab8500_probe(struct platform_device *pdev)
 
 static const struct platform_device_id ab8500_id[] = {
 	{ "ab8500-core", AB8500_VERSION_AB8500 },
-	{ "ab8505-i2c", AB8500_VERSION_AB8505 },
+	{ "ab8505-core", AB8500_VERSION_AB8505 },
 	{ "ab9540-i2c", AB8500_VERSION_AB9540 },
 	{ "ab8540-i2c", AB8500_VERSION_AB8540 },
 	{ }
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 57ac58b4b5f3..26d967a1a046 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -3060,30 +3060,44 @@ static const struct mfd_cell db8500_prcmu_devs[] = {
 static int db8500_prcmu_register_ab8500(struct device *parent)
 {
 	struct device_node *np;
-	struct resource ab8500_resource;
+	struct resource ab850x_resource;
 	const struct mfd_cell ab8500_cell = {
 		.name = "ab8500-core",
 		.of_compatible = "stericsson,ab8500",
 		.id = AB8500_VERSION_AB8500,
-		.resources = &ab8500_resource,
+		.resources = &ab850x_resource,
 		.num_resources = 1,
 	};
+	const struct mfd_cell ab8505_cell = {
+		.name = "ab8505-core",
+		.of_compatible = "stericsson,ab8505",
+		.id = AB8500_VERSION_AB8505,
+		.resources = &ab850x_resource,
+		.num_resources = 1,
+	};
+	const struct mfd_cell *ab850x_cell;
 
 	if (!parent->of_node)
 		return -ENODEV;
 
 	/* Look up the device node, sneak the IRQ out of it */
 	for_each_child_of_node(parent->of_node, np) {
-		if (of_device_is_compatible(np, ab8500_cell.of_compatible))
+		if (of_device_is_compatible(np, ab8500_cell.of_compatible)) {
+			ab850x_cell = &ab8500_cell;
 			break;
+		}
+		if (of_device_is_compatible(np, ab8505_cell.of_compatible)) {
+			ab850x_cell = &ab8505_cell;
+			break;
+		}
 	}
 	if (!np) {
-		dev_info(parent, "could not find AB8500 node in the device tree\n");
+		dev_info(parent, "could not find AB850X node in the device tree\n");
 		return -ENODEV;
 	}
-	of_irq_to_resource_table(np, &ab8500_resource, 1);
+	of_irq_to_resource_table(np, &ab850x_resource, 1);
 
-	return mfd_add_devices(parent, 0, &ab8500_cell, 1, NULL, 0, NULL);
+	return mfd_add_devices(parent, 0, ab850x_cell, 1, NULL, 0, NULL);
 }
 
 /**
-- 
2.23.0