[PATCH 0/4] arm/tegra: Convert gpio & pinmux to platform devices

[PATCH 0/4] arm/tegra: Convert gpio & pinmux to platform devices

[Stephen Warren]

This series converts the Tegra GPIO and pinmux drivers to be regular
platform devices.

The series is extracted from an earlier series I posted that augmented
these drivers to initialize HW state from the device-tree. I'm holding
off on that aspect of the changes, since it's not entirely clear to me
whether the new pinmux API should drive the initial pinmux state setup
via "system hog" definitions, or whether pinmux drivers should indeed
do their own thing.

Dependencies:
* The patches need to be merged in one branch in order for bisectability.

* At least patch 3 depends on changes in Russell's gpio branch, since it
  edits a file renamed there. I imagine the series will be merged into
  that branch.

* The whole series is based off next-20110922 plus a couple patches in the
  ARM patch system (7094, 7095).

* This series affects both the GPIO and pinmux drivers. Potentially, the
  changes to the two driver could be split into separate series, but this
  would be complicated by the fact patch 1 edits all the board files to
  make the same change for both GPIO and pinmux; if split up, merging that
  all back together would cause conflicts.

* Patch 1's changes to board-seaboard-pinmux.c will have some merge
  conflicts with the patches Peter De Schrijver recently posted to enhance
  that file to support Ventana; each of our patches will change the context
  changes in the others' diffs. I'm not sure how best to manage this.
 
Stephen Warren (4):
  arm/tegra: Prep boards for gpio/pinmux conversion to pdevs
  arm/dt: Tegra: Add pinmux node to tegra20.dtsi
  gpio/tegra: Convert to a platform device
  arm/tegra: Convert pinmux driver to a platform device

 .../devicetree/bindings/pinmux/pinmux_nvidia.txt   |    5 +++
 arch/arm/boot/dts/tegra20.dtsi                     |    5 +++
 arch/arm/mach-tegra/board-harmony-pinmux.c         |    8 +++++
 arch/arm/mach-tegra/board-paz00-pinmux.c           |    8 +++++
 arch/arm/mach-tegra/board-seaboard-pinmux.c        |    9 ++++-
 arch/arm/mach-tegra/board-trimslice-pinmux.c       |    7 ++++
 arch/arm/mach-tegra/devices.c                      |   10 ++++++
 arch/arm/mach-tegra/devices.h                      |    2 +
 arch/arm/mach-tegra/pinmux.c                       |   26 ++++++++++++++++
 drivers/gpio/gpio-tegra.c                          |   31 +++++++++++++-------
 10 files changed, 98 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinmux/pinmux_nvidia.txt

[PATCH 1/4] arm/tegra: Prep boards for gpio/pinmux conversion to pdevs

[Stephen Warren]

The Tegra GPIO driver will be converted from static registration via
postcore_initcall() to be a platform device later in this patch series.
A new Tegra pinmux platform device will also be added.

Prepare for this by modifying all boards to register the appropriate
platform devices before-hand, so that when the drivers are converted,
those devices will be probed, and git bisectability will be maintained.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
See patch 0000 for details on dependencies.

 arch/arm/mach-tegra/board-harmony-pinmux.c   |    8 ++++++++
 arch/arm/mach-tegra/board-paz00-pinmux.c     |    8 ++++++++
 arch/arm/mach-tegra/board-seaboard-pinmux.c  |    9 +++++++--
 arch/arm/mach-tegra/board-trimslice-pinmux.c |    7 +++++++
 arch/arm/mach-tegra/devices.c                |   10 ++++++++++
 arch/arm/mach-tegra/devices.h                |    2 ++
 6 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-tegra/board-harmony-pinmux.c b/arch/arm/mach-tegra/board-harmony-pinmux.c
index 4d63e2e..e99b456 100644
--- a/arch/arm/mach-tegra/board-harmony-pinmux.c
+++ b/arch/arm/mach-tegra/board-harmony-pinmux.c
@@ -20,6 +20,7 @@
 
 #include "gpio-names.h"
 #include "board-harmony.h"
+#include "devices.h"
 
 static struct tegra_pingroup_config harmony_pinmux[] = {
 	{TEGRA_PINGROUP_ATA,   TEGRA_MUX_IDE,           TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
@@ -140,6 +141,11 @@ static struct tegra_pingroup_config harmony_pinmux[] = {
 	{TEGRA_PINGROUP_XM2D,  TEGRA_MUX_NONE,          TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
 };
 
+static struct platform_device *pinmux_devices[] = {
+	&tegra_gpio_device,
+	&tegra_pinmux_device,
+};
+
 static struct tegra_gpio_table gpio_table[] = {
 	{ .gpio = TEGRA_GPIO_SD2_CD,		.enable = true	},
 	{ .gpio = TEGRA_GPIO_SD2_WP,		.enable = true	},
@@ -155,6 +161,8 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void harmony_pinmux_init(void)
 {
+	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+
 	tegra_pinmux_config_table(harmony_pinmux, ARRAY_SIZE(harmony_pinmux));
 
 	tegra_gpio_config(gpio_table, ARRAY_SIZE(gpio_table));
diff --git a/arch/arm/mach-tegra/board-paz00-pinmux.c b/arch/arm/mach-tegra/board-paz00-pinmux.c
index 2225769..fb20894 100644
--- a/arch/arm/mach-tegra/board-paz00-pinmux.c
+++ b/arch/arm/mach-tegra/board-paz00-pinmux.c
@@ -20,6 +20,7 @@
 
 #include "gpio-names.h"
 #include "board-paz00.h"
+#include "devices.h"
 
 static struct tegra_pingroup_config paz00_pinmux[] = {
 	{TEGRA_PINGROUP_ATA,   TEGRA_MUX_GMI,           TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
@@ -140,6 +141,11 @@ static struct tegra_pingroup_config paz00_pinmux[] = {
 	{TEGRA_PINGROUP_XM2D,  TEGRA_MUX_NONE,          TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
 };
 
+static struct platform_device *pinmux_devices[] = {
+	&tegra_gpio_device,
+	&tegra_pinmux_device,
+};
+
 static struct tegra_gpio_table gpio_table[] = {
 	{ .gpio = TEGRA_GPIO_SD1_CD,	.enable = true },
 	{ .gpio = TEGRA_GPIO_SD1_WP,	.enable = true },
@@ -152,6 +158,8 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void paz00_pinmux_init(void)
 {
+	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+
 	tegra_pinmux_config_table(paz00_pinmux, ARRAY_SIZE(paz00_pinmux));
 
 	tegra_gpio_config(gpio_table, ARRAY_SIZE(gpio_table));
diff --git a/arch/arm/mach-tegra/board-seaboard-pinmux.c b/arch/arm/mach-tegra/board-seaboard-pinmux.c
index 74f78b7..f092298 100644
--- a/arch/arm/mach-tegra/board-seaboard-pinmux.c
+++ b/arch/arm/mach-tegra/board-seaboard-pinmux.c
@@ -21,6 +21,7 @@
 
 #include "gpio-names.h"
 #include "board-seaboard.h"
+#include "devices.h"
 
 #define DEFAULT_DRIVE(_name)					\
 	{							\
@@ -157,8 +158,10 @@ static __initdata struct tegra_pingroup_config seaboard_pinmux[] = {
 	{TEGRA_PINGROUP_XM2D,  TEGRA_MUX_NONE,          TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
 };
 
-
-
+static struct platform_device *pinmux_devices[] = {
+	&tegra_gpio_device,
+	&tegra_pinmux_device,
+};
 
 static struct tegra_gpio_table gpio_table[] = {
 	{ .gpio = TEGRA_GPIO_SD2_CD,		.enable = true },
@@ -173,6 +176,8 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void __init seaboard_pinmux_init(void)
 {
+	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+
 	tegra_pinmux_config_table(seaboard_pinmux, ARRAY_SIZE(seaboard_pinmux));
 
 	tegra_drive_pinmux_config_table(seaboard_drive_pinmux,
diff --git a/arch/arm/mach-tegra/board-trimslice-pinmux.c b/arch/arm/mach-tegra/board-trimslice-pinmux.c
index bcb1916..4969dd2 100644
--- a/arch/arm/mach-tegra/board-trimslice-pinmux.c
+++ b/arch/arm/mach-tegra/board-trimslice-pinmux.c
@@ -21,6 +21,7 @@
 
 #include "gpio-names.h"
 #include "board-trimslice.h"
+#include "devices.h"
 
 static __initdata struct tegra_pingroup_config trimslice_pinmux[] = {
 	{TEGRA_PINGROUP_ATA,   TEGRA_MUX_IDE,           TEGRA_PUPD_NORMAL,	TEGRA_TRI_TRISTATE},
@@ -141,6 +142,11 @@ static __initdata struct tegra_pingroup_config trimslice_pinmux[] = {
 	{TEGRA_PINGROUP_XM2D,  TEGRA_MUX_NONE,          TEGRA_PUPD_NORMAL,      TEGRA_TRI_NORMAL},
 };
 
+static struct platform_device *pinmux_devices[] = {
+	&tegra_gpio_device,
+	&tegra_pinmux_device,
+};
+
 static struct tegra_gpio_table gpio_table[] = {
 	{ .gpio = TRIMSLICE_GPIO_SD4_CD, .enable = true	}, /* mmc4 cd */
 	{ .gpio = TRIMSLICE_GPIO_SD4_WP, .enable = true	}, /* mmc4 wp */
@@ -151,6 +157,7 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void __init trimslice_pinmux_init(void)
 {
+	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
 	tegra_pinmux_config_table(trimslice_pinmux, ARRAY_SIZE(trimslice_pinmux));
 	tegra_gpio_config(gpio_table, ARRAY_SIZE(gpio_table));
 }
diff --git a/arch/arm/mach-tegra/devices.c b/arch/arm/mach-tegra/devices.c
index 57e35d2..48262bf 100644
--- a/arch/arm/mach-tegra/devices.c
+++ b/arch/arm/mach-tegra/devices.c
@@ -31,6 +31,16 @@
 #include <mach/usb_phy.h>
 #include "gpio-names.h"
 
+struct platform_device tegra_gpio_device = {
+	.name		= "tegra-gpio",
+	.id		= -1,
+};
+
+struct platform_device tegra_pinmux_device = {
+	.name		= "tegra-pinmux",
+	.id		= -1,
+};
+
 static struct resource i2c_resource1[] = {
 	[0] = {
 		.start	= INT_I2C,
diff --git a/arch/arm/mach-tegra/devices.h b/arch/arm/mach-tegra/devices.h
index 4a7dc0a..873ecb2 100644
--- a/arch/arm/mach-tegra/devices.h
+++ b/arch/arm/mach-tegra/devices.h
@@ -21,6 +21,8 @@
 
 #include <linux/platform_device.h>
 
+extern struct platform_device tegra_gpio_device;
+extern struct platform_device tegra_pinmux_device;
 extern struct platform_device tegra_sdhci_device1;
 extern struct platform_device tegra_sdhci_device2;
 extern struct platform_device tegra_sdhci_device3;
-- 
1.7.0.4

[PATCH 2/4] arm/dt: Tegra: Add pinmux node to tegra20.dtsi

[Stephen Warren]

Add a pinmux node to tegra20.dtsi in order to instantiate the future
pinmux device.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
See patch 0000 for details on dependencies.

 .../devicetree/bindings/pinmux/pinmux_nvidia.txt   |    5 +++++
 arch/arm/boot/dts/tegra20.dtsi                     |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinmux/pinmux_nvidia.txt

diff --git a/Documentation/devicetree/bindings/pinmux/pinmux_nvidia.txt b/Documentation/devicetree/bindings/pinmux/pinmux_nvidia.txt
new file mode 100644
index 0000000..36f82db
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinmux/pinmux_nvidia.txt
@@ -0,0 +1,5 @@
+NVIDIA Tegra 2 pinmux controller
+
+Required properties:
+- compatible : "nvidia,tegra20-pinmux"
+
diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi
index 5727595..5921c1d 100644
--- a/arch/arm/boot/dts/tegra20.dtsi
+++ b/arch/arm/boot/dts/tegra20.dtsi
@@ -77,6 +77,11 @@
 		gpio-controller;
 	};
 
+	pinmux: pinmux@70000000 {
+		compatible = "nvidia,tegra20-pinmux";
+		reg = < 0x70000000 0xc00 >;
+	};
+
 	serial@70006000 {
 		compatible = "nvidia,tegra20-uart";
 		reg = <0x70006000 0x40>;
-- 
1.7.0.4

[PATCH 3/4] gpio/tegra: Convert to a platform device

[Stephen Warren]

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
See patch 0000 for details on dependencies.

 drivers/gpio/gpio-tegra.c |   31 ++++++++++++++++++++-----------
 1 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 6b65207..849da25 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -20,10 +20,10 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
-
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/of.h>
+#include <linux/platform_device.h>
 
 #include <asm/mach/irq.h>
 
@@ -333,7 +333,7 @@ static struct irq_chip tegra_gpio_irq_chip = {
  */
 static struct lock_class_key gpio_lock_class;
 
-static int __init tegra_gpio_init(void)
+static int __init tegra_gpio_probe(struct platform_device *pdev)
 {
 	struct tegra_gpio_bank *bank;
 	int gpio;
@@ -347,15 +347,6 @@ static int __init tegra_gpio_init(void)
 		}
 	}
 
-#ifdef CONFIG_OF_GPIO
-	/*
-	 * This isn't ideal, but it gets things hooked up until this
-	 * driver is converted into a platform_device
-	 */
-	tegra_gpio_chip.of_node = of_find_compatible_node(NULL, NULL,
-						"nvidia,tegra20-gpio");
-#endif /* CONFIG_OF_GPIO */
-
 	gpiochip_add(&tegra_gpio_chip);
 
 	for (gpio = 0; gpio < TEGRA_NR_GPIOS; gpio++) {
@@ -384,6 +375,24 @@ static int __init tegra_gpio_init(void)
 	return 0;
 }
 
+static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
+	{ .compatible = "nvidia,tegra20-gpio", },
+	{ },
+};
+
+static struct platform_driver tegra_gpio_driver = {
+	.driver		= {
+		.name	= "tegra-gpio",
+		.owner	= THIS_MODULE,
+		.of_match_table = tegra_gpio_of_match,
+	},
+	.probe		= tegra_gpio_probe,
+};
+
+static int __init tegra_gpio_init(void)
+{
+	return platform_driver_register(&tegra_gpio_driver);
+}
 postcore_initcall(tegra_gpio_init);
 
 void __init tegra_gpio_config(struct tegra_gpio_table *table, int num)
-- 
1.7.0.4

[PATCH 4/4] arm/tegra: Convert pinmux driver to a platform device

[Stephen Warren]

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
See patch 0000 for details on dependencies.

 arch/arm/mach-tegra/pinmux.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-tegra/pinmux.c b/arch/arm/mach-tegra/pinmux.c
index f80d507..46b9d87 100644
--- a/arch/arm/mach-tegra/pinmux.c
+++ b/arch/arm/mach-tegra/pinmux.c
@@ -20,6 +20,7 @@
 #include <linux/errno.h>
 #include <linux/spinlock.h>
 #include <linux/io.h>
+#include <linux/platform_device.h>
 
 #include <mach/iomap.h>
 #include <mach/pinmux.h>
@@ -665,6 +666,31 @@ void tegra_pinmux_config_pullupdown_table(const struct tegra_pingroup_config *co
 	}
 }
 
+static int __init tegra_pinmux_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct of_device_id tegra_pinmux_of_match[] __devinitdata = {
+	{ .compatible = "nvidia,tegra20-pinmux", },
+	{ },
+};
+
+static struct platform_driver tegra_pinmux_driver = {
+	.driver		= {
+		.name	= "tegra-pinmux",
+		.owner	= THIS_MODULE,
+		.of_match_table = tegra_pinmux_of_match,
+	},
+	.probe		= tegra_pinmux_probe,
+};
+
+static int __init tegra_pinmux_init(void)
+{
+	return platform_driver_register(&tegra_pinmux_driver);
+}
+postcore_initcall(tegra_pinmux_init);
+
 #ifdef	CONFIG_DEBUG_FS
 
 #include <linux/debugfs.h>
-- 
1.7.0.4

Re: [PATCH 0/4] arm/tegra: Convert gpio & pinmux to platform devices

[Arnd Bergmann]

On Thursday 22 September 2011, Stephen Warren wrote:
> 
> This series converts the Tegra GPIO and pinmux drivers to be regular
> platform devices.

Looks good overall.

> The series is extracted from an earlier series I posted that augmented
> these drivers to initialize HW state from the device-tree. I'm holding
> off on that aspect of the changes, since it's not entirely clear to me
> whether the new pinmux API should drive the initial pinmux state setup
> via "system hog" definitions, or whether pinmux drivers should indeed
> do their own thing.

I think at least you should try to do an ioremap of the pinmux register
area in the pinmux probe function and make sure that it's called early
enough, if at all possible.

Right now, there is an empty probe() function, which is a bit silly,
and the pg_readl()/pg_writel() functions use hardcoded register
addresses.

	Arnd

RE: [PATCH 0/4] arm/tegra: Convert gpio & pinmux to platform devices

[Stephen Warren]

Arnd Bergmann wrote at Friday, September 23, 2011 10:49 AM:
> On Thursday 22 September 2011, Stephen Warren wrote:
> >
> > This series converts the Tegra GPIO and pinmux drivers to be regular
> > platform devices.
> 
> Looks good overall.

Thanks.

> > The series is extracted from an earlier series I posted that augmented
> > these drivers to initialize HW state from the device-tree. I'm holding
> > off on that aspect of the changes, since it's not entirely clear to me
> > whether the new pinmux API should drive the initial pinmux state setup
> > via "system hog" definitions, or whether pinmux drivers should indeed
> > do their own thing.
> 
> I think at least you should try to do an ioremap of the pinmux register
> area in the pinmux probe function and make sure that it's called early
> enough, if at all possible.
> 
> Right now, there is an empty probe() function, which is a bit silly,
> and the pg_readl()/pg_writel() functions use hardcoded register
> addresses.

For GPIO, calling ioremap() should be pretty easy.

For pinmux, there are complications: The pinmux HW doesn't have a dedicated
address range, but rather the registers are somewhat scattered in groups
throughout the "APB_MISC" address range. APB_MISC also includes strapping,
JTAG configuration, and USB PHY registers, all of which exist between the
various groups of pinmux registers. On Tegra30, there's slightly less of
this, yet in turn this means that the number of chunks of address space used
by the pinmux module differs from Tegra20.

Right now, the pinmux driver data tables (which define the set of pin groups
known to the pinmux driver) all store register addresses as offsets from the
base of this APB_MISC region for simplicity.

What are your thoughts here; should I go ahead and update the pinmux driver
to ioremap() each of these chunks individually, and update the data tables
to be a tuple (chunk ID, offset_from_chunk), or leave things as is?

Thanks.

-- 
nvpublic