OMAP: GPIO: Implement GPIO as a platform device

Implement GPIO as a platform device.

GPIO APIs are used in machine_init functions. Hence it is
required to complete GPIO probe before board_init. Therefore
GPIO device register and driver register are implemented as
postcore_initcalls.

omap_gpio_init() does nothing now and this function would be
removed in the next patch as it's usage is spread across most
of the board files.

Inorder to convert GPIO as platform device, modifications are
required in clockxxxx_data.c file for OMAP1 so that device names
can be used to obtain clock instead of getting clocks by
name/NULL ptr.

Use runtime pm APIs (pm_runtime_put*/pm_runtime_get*) for enabling
or disabling the clocks, modify sysconfig settings and remove usage
of clock FW APIs.
Note 1: Converting GPIO driver to use runtime PM APIs is not done as a
separate patch because GPIO clock names are different for various OMAPs
and are different for some of the banks in the same CPU. This would need
usage of cpu_is checks and bank id checks while using clock FW APIs in
the gpio driver. Hence while making GPIO a platform driver framework,
PM runtime APIs are used directly.

Note 2: While implementing GPIO as a platform device, pm runtime APIs
are used as mentioned above and modification is not done in gpio's
prepare for idle/ resume after idle functions. This would be done
in the next patch series and GPIO driver would be made to use dev_pm_ops
instead of sysdev_class in that series only.

Due to the above, the GPIO driver implicitly relies on
CM_AUTOIDLE = 1 on its iclk for power management to work, since the
driver never disables its iclk.
This would be taken care in the next patch series (see Note 3 below).

Refer to
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg39112.html
for more details.

Note 3: only pm_runtime_get_sync is called in gpio's probe() and
pm_runtime_put* is never called. This is to make the implementation
similar to the existing GPIO code. Another patch series would be sent
to correct this.

In OMAP3 and OMAP4 gpio's debounce clocks are optional clocks. They
are enabled/ disabled whenever required using clock framework APIs

TODO:
1. Cleanup the GPIO driver. Use function pointers and register
offest pointers instead of using hardcoded values
2. Remove all cpu_is_ checks and OMAP specific macros
3. Remove usage of gpio_bank array so that only
   instance specific information is used in driver code
4. Rename 'method'/ avoid it's usage
5. Fix the non-wakeup gpios handling for OMAP2430, OMAP3 & OMAP4
6. Modify gpio's prepare for idle/ resume after idle functions
   to use runtime pm implentation.

Signed-off-by: Charulatha V <charu@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Reviewed-by: Basak, Partha <p-basak2@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
[tony@atomide.com: updated for bank specific revision and updated boards]
Signed-off-by: Tony Lindgren <tony@atomide.com>

26 files changed, 1 insertions, 27 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index ce7b1f017670..fbc87395a025 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -4,7 +4,7 @@
 
 # Common support
 obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o \
-         common.o
+         common.o gpio.o
 
 omap-2-3-common                         = irq.o sdrc.o prm2xxx_3xxx.o
 hwmod-common                            = omap_hwmod.o \
diff --git a/arch/arm/mach-omap2/board-2430sdp.c b/arch/arm/mach-omap2/board-2430sdp.c
index b527f8d187ad..0f14001c1641 100644
--- a/arch/arm/mach-omap2/board-2430sdp.c
+++ b/arch/arm/mach-omap2/board-2430sdp.c
@@ -145,7 +145,6 @@ static void __init omap_2430sdp_init_irq(void)
         omap_board_config_size = ARRAY_SIZE(sdp2430_config);
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct twl4030_gpio_platform_data sdp2430_gpio_data = {
diff --git a/arch/arm/mach-omap2/board-3430sdp.c b/arch/arm/mach-omap2/board-3430sdp.c
index 4e3742c512b8..5cb23f3d4fc0 100644
--- a/arch/arm/mach-omap2/board-3430sdp.c
+++ b/arch/arm/mach-omap2/board-3430sdp.c
@@ -328,7 +328,6 @@ static void __init omap_3430sdp_init_irq(void)
         omap3_pm_init_cpuidle(omap3_cpuidle_params_table);
         omap2_init_common_hw(hyb18m512160af6_sdrc_params, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static int sdp3430_batt_table[] = {
diff --git a/arch/arm/mach-omap2/board-3630sdp.c b/arch/arm/mach-omap2/board-3630sdp.c
index bbcf580fa097..b23f401aa6b6 100644
--- a/arch/arm/mach-omap2/board-3630sdp.c
+++ b/arch/arm/mach-omap2/board-3630sdp.c
@@ -76,7 +76,6 @@ static void __init omap_sdp_init_irq(void)
         omap2_init_common_hw(h8mbx00u0mer0em_sdrc_params,
                         h8mbx00u0mer0em_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 #ifdef CONFIG_OMAP_MUX
diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index 94d989bee8ad..8842ec5e51e3 100644
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -223,7 +223,6 @@ static void __init omap_4430sdp_init_irq(void)
         omap2_gp_clockevent_set_gptimer(1);
 #endif
         gic_init_irq();
-        omap_gpio_init();
 }
 
 static struct omap_musb_board_data musb_board_data = {
diff --git a/arch/arm/mach-omap2/board-am3517crane.c b/arch/arm/mach-omap2/board-am3517crane.c
index 13ead330e389..8ba404770e75 100644
--- a/arch/arm/mach-omap2/board-am3517crane.c
+++ b/arch/arm/mach-omap2/board-am3517crane.c
@@ -19,7 +19,6 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
@@ -50,7 +49,6 @@ static void __init am3517_crane_init_irq(void)
 
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static void __init am3517_crane_init(void)
diff --git a/arch/arm/mach-omap2/board-am3517evm.c b/arch/arm/mach-omap2/board-am3517evm.c
index 07399505312b..df6900e8ad5a 100644
--- a/arch/arm/mach-omap2/board-am3517evm.c
+++ b/arch/arm/mach-omap2/board-am3517evm.c
@@ -392,7 +392,6 @@ static void __init am3517_evm_init_irq(void)
 
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct omap_musb_board_data musb_board_data = {
diff --git a/arch/arm/mach-omap2/board-apollon.c b/arch/arm/mach-omap2/board-apollon.c
index 6ae777e08896..f51f4f1e07f7 100644
--- a/arch/arm/mach-omap2/board-apollon.c
+++ b/arch/arm/mach-omap2/board-apollon.c
@@ -280,7 +280,6 @@ static void __init omap_apollon_init_irq(void)
         omap_board_config_size = ARRAY_SIZE(apollon_config);
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static void __init apollon_led_init(void)
diff --git a/arch/arm/mach-omap2/board-cm-t35.c b/arch/arm/mach-omap2/board-cm-t35.c
index 63f764e2af3f..78b67fb790bf 100644
--- a/arch/arm/mach-omap2/board-cm-t35.c
+++ b/arch/arm/mach-omap2/board-cm-t35.c
@@ -686,7 +686,6 @@ static void __init cm_t35_init_irq(void)
         omap2_init_common_hw(mt46h32m32lf6_sdrc_params,
                              mt46h32m32lf6_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct omap_board_mux board_mux[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-cm-t3517.c b/arch/arm/mach-omap2/board-cm-t3517.c
index 1dd303e9a267..7ee23dab84fe 100644
--- a/arch/arm/mach-omap2/board-cm-t3517.c
+++ b/arch/arm/mach-omap2/board-cm-t3517.c
@@ -250,7 +250,6 @@ static void __init cm_t3517_init_irq(void)
 
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct omap_board_mux board_mux[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-devkit8000.c b/arch/arm/mach-omap2/board-devkit8000.c
index 53ac762518bd..a30a7fce8cbf 100644
--- a/arch/arm/mach-omap2/board-devkit8000.c
+++ b/arch/arm/mach-omap2/board-devkit8000.c
@@ -450,7 +450,6 @@ static void __init devkit8000_init_irq(void)
 #ifdef CONFIG_OMAP_32K_TIMER
         omap2_gp_clockevent_set_gptimer(12);
 #endif
-        omap_gpio_init();
 }
 
 static void __init devkit8000_ads7846_init(void)
diff --git a/arch/arm/mach-omap2/board-h4.c b/arch/arm/mach-omap2/board-h4.c
index 929993b4bf26..68e6f4c8e00a 100644
--- a/arch/arm/mach-omap2/board-h4.c
+++ b/arch/arm/mach-omap2/board-h4.c
@@ -293,7 +293,6 @@ static void __init omap_h4_init_irq(void)
         omap_board_config_size = ARRAY_SIZE(h4_config);
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
         h4_init_flash();
 }
 
diff --git a/arch/arm/mach-omap2/board-igep0020.c b/arch/arm/mach-omap2/board-igep0020.c
index fe76b59b13ed..3bda186fe677 100644
--- a/arch/arm/mach-omap2/board-igep0020.c
+++ b/arch/arm/mach-omap2/board-igep0020.c
@@ -484,7 +484,6 @@ static void __init igep2_init_irq(void)
 {
         omap2_init_common_hw(m65kxxxxam_sdrc_params, m65kxxxxam_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct twl4030_codec_audio_data igep2_audio_data = {
diff --git a/arch/arm/mach-omap2/board-igep0030.c b/arch/arm/mach-omap2/board-igep0030.c
index 22b0b253e16b..c7c57cdf83d6 100644
--- a/arch/arm/mach-omap2/board-igep0030.c
+++ b/arch/arm/mach-omap2/board-igep0030.c
@@ -291,7 +291,6 @@ static void __init igep3_init_irq(void)
 {
         omap2_init_common_hw(m65kxxxxam_sdrc_params, m65kxxxxam_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct twl4030_platform_data igep3_twl4030_pdata = {
diff --git a/arch/arm/mach-omap2/board-ldp.c b/arch/arm/mach-omap2/board-ldp.c
index 3dab44e3eb42..d97e3caed7c0 100644
--- a/arch/arm/mach-omap2/board-ldp.c
+++ b/arch/arm/mach-omap2/board-ldp.c
@@ -294,7 +294,6 @@ static void __init omap_ldp_init_irq(void)
         omap_board_config_size = ARRAY_SIZE(ldp_config);
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct twl4030_usb_data ldp_usb_data = {
diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index e823c7042ab3..d8a489338e0c 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -641,7 +641,6 @@ static void __init n8x0_init_irq(void)
 {
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 #ifdef CONFIG_OMAP_MUX
diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 14f42240ae79..a4131bef50fb 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -490,7 +490,6 @@ static void __init omap3_beagle_init_irq(void)
 #ifdef CONFIG_OMAP_32K_TIMER
         omap2_gp_clockevent_set_gptimer(12);
 #endif
-        omap_gpio_init();
 }
 
 static struct platform_device *omap3_beagle_devices[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-omap2/board-omap3evm.c
index b04365c6bb10..5ca02202d608 100644
--- a/arch/arm/mach-omap2/board-omap3evm.c
+++ b/arch/arm/mach-omap2/board-omap3evm.c
@@ -625,7 +625,6 @@ static void __init omap3_evm_init_irq(void)
         omap_board_config_size = ARRAY_SIZE(omap3_evm_config);
         omap2_init_common_hw(mt46h32m32lf6_sdrc_params, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct platform_device *omap3_evm_devices[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-omap3logic.c b/arch/arm/mach-omap2/board-omap3logic.c
index 5f7d2c1e7ef5..263294044c7e 100644
--- a/arch/arm/mach-omap2/board-omap3logic.c
+++ b/arch/arm/mach-omap2/board-omap3logic.c
@@ -199,7 +199,6 @@ static void __init omap3logic_init_irq(void)
 {
         omap2_init_common_hw(NULL, NULL);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 #ifdef CONFIG_OMAP_MUX
diff --git a/arch/arm/mach-omap2/board-omap3pandora.c b/arch/arm/mach-omap2/board-omap3pandora.c
index 89ed1be2d62e..1031d7cadb3a 100644
--- a/arch/arm/mach-omap2/board-omap3pandora.c
+++ b/arch/arm/mach-omap2/board-omap3pandora.c
@@ -639,7 +639,6 @@ static void __init omap3pandora_init_irq(void)
         omap2_init_common_hw(mt46h32m32lf6_sdrc_params,
                              mt46h32m32lf6_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static void pandora_wl1251_set_power(bool enable)
diff --git a/arch/arm/mach-omap2/board-omap3stalker.c b/arch/arm/mach-omap2/board-omap3stalker.c
index f25272125413..ea13e2aeeec5 100644
--- a/arch/arm/mach-omap2/board-omap3stalker.c
+++ b/arch/arm/mach-omap2/board-omap3stalker.c
@@ -589,7 +589,6 @@ static void __init omap3_stalker_init_irq(void)
 #ifdef CONFIG_OMAP_32K_TIMER
         omap2_gp_clockevent_set_gptimer(12);
 #endif
-        omap_gpio_init();
 }
 
 static struct platform_device *omap3_stalker_devices[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-omap3touchbook.c b/arch/arm/mach-omap2/board-omap3touchbook.c
index 41104bb8774c..2339964058cc 100644
--- a/arch/arm/mach-omap2/board-omap3touchbook.c
+++ b/arch/arm/mach-omap2/board-omap3touchbook.c
@@ -428,7 +428,6 @@ static void __init omap3_touchbook_init_irq(void)
 #ifdef CONFIG_OMAP_32K_TIMER
         omap2_gp_clockevent_set_gptimer(12);
 #endif
-        omap_gpio_init();
 }
 
 static struct platform_device *omap3_touchbook_devices[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c
index 801f8146b00c..38f942beb121 100644
--- a/arch/arm/mach-omap2/board-omap4panda.c
+++ b/arch/arm/mach-omap2/board-omap4panda.c
@@ -79,7 +79,6 @@ static void __init omap4_panda_init_irq(void)
 {
         omap2_init_common_hw(NULL, NULL);
         gic_init_irq();
-        omap_gpio_init();
 }
 
 static const struct ehci_hcd_omap_platform_data ehci_pdata __initconst = {
diff --git a/arch/arm/mach-omap2/board-overo.c b/arch/arm/mach-omap2/board-overo.c
index 7053bc0b46db..805b78393393 100644
--- a/arch/arm/mach-omap2/board-overo.c
+++ b/arch/arm/mach-omap2/board-overo.c
@@ -416,7 +416,6 @@ static void __init overo_init_irq(void)
         omap2_init_common_hw(mt46h32m32lf6_sdrc_params,
                              mt46h32m32lf6_sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 static struct platform_device *overo_devices[] __initdata = {
diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 36f2cf4efd57..1c3b0795c6e2 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -108,7 +108,6 @@ static void __init rx51_init_irq(void)
         sdrc_params = rx51_get_sdram_timings();
         omap2_init_common_hw(sdrc_params, sdrc_params);
         omap_init_irq();
-        omap_gpio_init();
 }
 
 extern void __init rx51_peripherals_init(void);
diff --git a/arch/arm/mach-omap2/board-zoom.c b/arch/arm/mach-omap2/board-zoom.c
index 3da69e4102a4..abd864a50b4e 100644
--- a/arch/arm/mach-omap2/board-zoom.c
+++ b/arch/arm/mach-omap2/board-zoom.c
@@ -43,7 +43,6 @@ static void __init omap_zoom_init_irq(void)
                                 h8mbx00u0mer0em_sdrc_params);
 
         omap_init_irq();
-        omap_gpio_init();
 }
 
 #ifdef CONFIG_OMAP_MUX