[PATCH v3 1/3] dt: add empty of_machine_is_compatible

[PATCH v3 1/3] dt: add empty of_machine_is_compatible

[Stephen Warren]

The patch adds an empty function for non-dt build, so that
drivers migrating to dt can save some '#ifdef CONFIG_OF'.

v3: New patch

Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
Patch 2 relies on this patch, but this patch would typically be merged via
Grant's OF/DT tree.

 include/linux/of.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/of.h b/include/linux/of.h
index 736b747..47303c7 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -302,6 +302,11 @@ static inline struct device_node *of_parse_phandle(struct device_node *np,
 	return NULL;
 }
 
+static inline int of_machine_is_compatible(const char *compat)
+{
+	return 0;
+}
+
 #define of_match_ptr(_ptr)	NULL
 #endif /* CONFIG_OF */
 
-- 
1.7.4.1

[PATCH v3 2/3] arm/tegra: Don't create duplicate gpio and pinmux devices

[Stephen Warren]

*_pinmux_init() register the GPIO and pinmux devices so that they're ready
before any other device needs them.

*_pinmux_init() are also called by board-dt.c in order to set up the GPIO
and pinmux configurations. In this case, if we register the devices, they
end up being probed once due to this registration, and a second time due
to a device-tree node (or vice-versa). The second probe fails since the
memory regions are already requested. Besides, we don't actually want the
duplicated devices.

To avoid this duplicate registration, modify *_pinmux_init() to check
whether it's running on a DT machine. If not, register the pinmux devices.
If so, don't register them.

Finally, modify board-dt.c to call the *_pinmux_init() after all devices have
been instantiated from device-tree. This allows the GPIO and pinmux devices
to be instantiated and initialized before calling functions to configure the
hardware.

This has one disadvantage: The pinmux and GPIO initialization now happens
after /all/ devices are instantiated, rather than after just gpio and
pinmux but before anything else. So the correct HW configuration is not
in place when e.g. the SD/MMC device is probed. Long-term, this should be
solved by doing both:

a) Initializing the HW state from DT nodes during GPIO and pinmux device
   probe.
b) Using the deferred driver probe mechanism, so that drivers can defer
   their probe until after the gpio and pinmux drivers have probed.

v2: s/int is_dt/bool is_dt/
v3: Use of_machine_is_compatible inside *_pinmux_init() rather than passing
an explicit parameter into the function from outside.

Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/mach-tegra/board-dt.c               |   13 +++++++------
 arch/arm/mach-tegra/board-harmony-pinmux.c   |    6 +++++-
 arch/arm/mach-tegra/board-paz00-pinmux.c     |    6 +++++-
 arch/arm/mach-tegra/board-seaboard-pinmux.c  |    5 ++++-
 arch/arm/mach-tegra/board-trimslice-pinmux.c |    5 ++++-
 5 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
index d368f8d..74743ad 100644
--- a/arch/arm/mach-tegra/board-dt.c
+++ b/arch/arm/mach-tegra/board-dt.c
@@ -101,6 +101,13 @@ static void __init tegra_dt_init(void)
 
 	tegra_clk_init_from_table(tegra_dt_clk_init_table);
 
+	/*
+	 * Finished with the static registrations now; fill in the missing
+	 * devices
+	 */
+	of_platform_populate(NULL, tegra_dt_match_table,
+				tegra20_auxdata_lookup, NULL);
+
 	for (i = 0; i < ARRAY_SIZE(pinmux_configs); i++) {
 		if (of_machine_is_compatible(pinmux_configs[i].machine)) {
 			pinmux_configs[i].init();
@@ -110,12 +117,6 @@ static void __init tegra_dt_init(void)
 
 	WARN(i == ARRAY_SIZE(pinmux_configs),
 		"Unknown platform! Pinmuxing not initialized\n");
-
-	/*
-	 * Finished with the static registrations now; fill in the missing
-	 * devices
-	 */
-	of_platform_populate(NULL, tegra_dt_match_table, tegra20_auxdata_lookup, NULL);
 }
 
 static const char * tegra_dt_board_compat[] = {
diff --git a/arch/arm/mach-tegra/board-harmony-pinmux.c b/arch/arm/mach-tegra/board-harmony-pinmux.c
index e99b456..7a4a26d 100644
--- a/arch/arm/mach-tegra/board-harmony-pinmux.c
+++ b/arch/arm/mach-tegra/board-harmony-pinmux.c
@@ -16,6 +16,8 @@
 
 #include <linux/kernel.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
+
 #include <mach/pinmux.h>
 
 #include "gpio-names.h"
@@ -161,7 +163,9 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void harmony_pinmux_init(void)
 {
-	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+	if (!of_machine_is_compatible("nvidia,tegra20"))
+		platform_add_devices(pinmux_devices,
+					ARRAY_SIZE(pinmux_devices));
 
 	tegra_pinmux_config_table(harmony_pinmux, ARRAY_SIZE(harmony_pinmux));
 
diff --git a/arch/arm/mach-tegra/board-paz00-pinmux.c b/arch/arm/mach-tegra/board-paz00-pinmux.c
index fb20894..be30e21 100644
--- a/arch/arm/mach-tegra/board-paz00-pinmux.c
+++ b/arch/arm/mach-tegra/board-paz00-pinmux.c
@@ -16,6 +16,8 @@
 
 #include <linux/kernel.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
+
 #include <mach/pinmux.h>
 
 #include "gpio-names.h"
@@ -158,7 +160,9 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void paz00_pinmux_init(void)
 {
-	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+	if (!of_machine_is_compatible("nvidia,tegra20"))
+		platform_add_devices(pinmux_devices,
+					ARRAY_SIZE(pinmux_devices));
 
 	tegra_pinmux_config_table(paz00_pinmux, ARRAY_SIZE(paz00_pinmux));
 
diff --git a/arch/arm/mach-tegra/board-seaboard-pinmux.c b/arch/arm/mach-tegra/board-seaboard-pinmux.c
index fbce31d..eb5991d 100644
--- a/arch/arm/mach-tegra/board-seaboard-pinmux.c
+++ b/arch/arm/mach-tegra/board-seaboard-pinmux.c
@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
 
 #include <mach/pinmux.h>
 #include <mach/pinmux-t2.h>
@@ -218,7 +219,9 @@ static void __init update_pinmux(struct tegra_pingroup_config *newtbl, int size)
 
 void __init seaboard_common_pinmux_init(void)
 {
-	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+	if (!of_machine_is_compatible("nvidia,tegra20"))
+		platform_add_devices(pinmux_devices,
+					ARRAY_SIZE(pinmux_devices));
 
 	tegra_pinmux_config_table(seaboard_pinmux, ARRAY_SIZE(seaboard_pinmux));
 
diff --git a/arch/arm/mach-tegra/board-trimslice-pinmux.c b/arch/arm/mach-tegra/board-trimslice-pinmux.c
index 4969dd2..7ab719d 100644
--- a/arch/arm/mach-tegra/board-trimslice-pinmux.c
+++ b/arch/arm/mach-tegra/board-trimslice-pinmux.c
@@ -16,6 +16,7 @@
 #include <linux/gpio.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/of.h>
 
 #include <mach/pinmux.h>
 
@@ -157,7 +158,9 @@ static struct tegra_gpio_table gpio_table[] = {
 
 void __init trimslice_pinmux_init(void)
 {
-	platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices));
+	if (!of_machine_is_compatible("nvidia,tegra20"))
+		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));
 }
-- 
1.7.4.1

Re: [PATCH v3 2/3] arm/tegra: Don't create duplicate gpio and pinmux devices

[Olof Johansson]

On Tue, Oct 25, 2011 at 02:01:27PM +0200, Stephen Warren wrote:
> *_pinmux_init() register the GPIO and pinmux devices so that they're ready
> before any other device needs them.
> 
> *_pinmux_init() are also called by board-dt.c in order to set up the GPIO
> and pinmux configurations. In this case, if we register the devices, they
> end up being probed once due to this registration, and a second time due
> to a device-tree node (or vice-versa). The second probe fails since the
> memory regions are already requested. Besides, we don't actually want the
> duplicated devices.
> 
> To avoid this duplicate registration, modify *_pinmux_init() to check
> whether it's running on a DT machine. If not, register the pinmux devices.
> If so, don't register them.
> 
> Finally, modify board-dt.c to call the *_pinmux_init() after all devices have
> been instantiated from device-tree. This allows the GPIO and pinmux devices
> to be instantiated and initialized before calling functions to configure the
> hardware.
> 
> This has one disadvantage: The pinmux and GPIO initialization now happens
> after /all/ devices are instantiated, rather than after just gpio and
> pinmux but before anything else. So the correct HW configuration is not
> in place when e.g. the SD/MMC device is probed. Long-term, this should be
> solved by doing both:
> 
> a) Initializing the HW state from DT nodes during GPIO and pinmux device
>    probe.
> b) Using the deferred driver probe mechanism, so that drivers can defer
>    their probe until after the gpio and pinmux drivers have probed.
> 
> v2: s/int is_dt/bool is_dt/
> v3: Use of_machine_is_compatible inside *_pinmux_init() rather than passing
> an explicit parameter into the function from outside.
> 
> Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
>  arch/arm/mach-tegra/board-dt.c               |   13 +++++++------
>  arch/arm/mach-tegra/board-harmony-pinmux.c   |    6 +++++-
>  arch/arm/mach-tegra/board-paz00-pinmux.c     |    6 +++++-
>  arch/arm/mach-tegra/board-seaboard-pinmux.c  |    5 ++++-
>  arch/arm/mach-tegra/board-trimslice-pinmux.c |    5 ++++-
>  5 files changed, 25 insertions(+), 10 deletions(-)

This looks pretty good. Given the fact that current behavior is buggy,
merging it for 3.2 makes sense. Grant, you OK with that for the
prerequisite OF patch?


-Olof

[PATCH v3 3/3] arm/tegra: Add device-tree support for TrimSlice board

[Stephen Warren]

* Add device-tree file for TrimSlice
* Add that to the list of .dts files to build
* Update board-dt.c to recognize TrimSlice board name

v2: Makefile: Add board-trimslice-pinmux.c to obj-$(CONFIG_MACH_TEGRA_DT).
v3: Makefile: Use brackets not braces around var names

Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/tegra-trimslice.dts |   38 +++++++++++++++++++++++++++++++++
 arch/arm/mach-tegra/Makefile          |    1 +
 arch/arm/mach-tegra/Makefile.boot     |    1 +
 arch/arm/mach-tegra/board-dt.c        |    3 ++
 4 files changed, 43 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/boot/dts/tegra-trimslice.dts

diff --git a/arch/arm/boot/dts/tegra-trimslice.dts b/arch/arm/boot/dts/tegra-trimslice.dts
new file mode 100644
index 0000000..d3d0d20
--- /dev/null
+++ b/arch/arm/boot/dts/tegra-trimslice.dts
@@ -0,0 +1,38 @@
+/dts-v1/;
+
+/memreserve/ 0x1c000000 0x04000000;
+/include/ "tegra20.dtsi"
+
+/ {
+	model = "Compulab TrimSlice board";
+	compatible = "compulab,trimslice", "nvidia,tegra20";
+
+	chosen {
+		bootargs = "vmalloc=192M video=tegrafb console=ttyS0,115200n8 root=/dev/mmcblk0p1 rw rootwait";
+	};
+
+	memory@0 {
+		reg = < 0x00000000 0x40000000 >;
+	};
+
+	i2c@7000c000 {
+		clock-frequency = <400000>;
+	};
+
+	i2c@7000c400 {
+		clock-frequency = <400000>;
+	};
+
+	i2c@7000c500 {
+		clock-frequency = <400000>;
+	};
+
+	serial@70006000 {
+		clock-frequency = < 216000000 >;
+	};
+
+	sdhci@c8000600 {
+		cd-gpios = <&gpio 121 0>;
+		wp-gpios = <&gpio 122 0>;
+	};
+};
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 91a07e1..3034d84 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -32,6 +32,7 @@ obj-${CONFIG_MACH_SEABOARD}             += board-seaboard-pinmux.o
 obj-${CONFIG_MACH_TEGRA_DT}             += board-dt.o
 obj-${CONFIG_MACH_TEGRA_DT}             += board-harmony-pinmux.o
 obj-${CONFIG_MACH_TEGRA_DT}             += board-seaboard-pinmux.o
+obj-$(CONFIG_MACH_TEGRA_DT)             += board-trimslice-pinmux.o
 
 obj-${CONFIG_MACH_TRIMSLICE}            += board-trimslice.o
 obj-${CONFIG_MACH_TRIMSLICE}            += board-trimslice-pinmux.o
diff --git a/arch/arm/mach-tegra/Makefile.boot b/arch/arm/mach-tegra/Makefile.boot
index bd12c9f..9f177a4 100644
--- a/arch/arm/mach-tegra/Makefile.boot
+++ b/arch/arm/mach-tegra/Makefile.boot
@@ -4,4 +4,5 @@ initrd_phys-$(CONFIG_ARCH_TEGRA_2x_SOC)	:= 0x00800000
 
 dtb-$(CONFIG_MACH_HARMONY) += tegra-harmony.dtb
 dtb-$(CONFIG_MACH_SEABOARD) += tegra-seaboard.dtb
+dtb-$(CONFIG_MACH_TRIMSLICE) += tegra-trimslice.dtb
 dtb-$(CONFIG_MACH_VENTANA) += tegra-ventana.dtb
diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
index 74743ad..79817b6 100644
--- a/arch/arm/mach-tegra/board-dt.c
+++ b/arch/arm/mach-tegra/board-dt.c
@@ -47,6 +47,7 @@
 
 void harmony_pinmux_init(void);
 void seaboard_pinmux_init(void);
+void trimslice_pinmux_init(void);
 void ventana_pinmux_init(void);
 
 struct of_dev_auxdata tegra20_auxdata_lookup[] __initdata = {
@@ -84,6 +85,7 @@ static struct {
 	char *machine;
 	void (*init)(void);
 } pinmux_configs[] = {
+	{ "compulab,trimslice", trimslice_pinmux_init },
 	{ "nvidia,harmony", harmony_pinmux_init },
 	{ "nvidia,seaboard", seaboard_pinmux_init },
 	{ "nvidia,ventana", ventana_pinmux_init },
@@ -120,6 +122,7 @@ static void __init tegra_dt_init(void)
 }
 
 static const char * tegra_dt_board_compat[] = {
+	"compulab,trimslice",
 	"nvidia,harmony",
 	"nvidia,seaboard",
 	"nvidia,ventana",
-- 
1.7.4.1