Re: [PATCH 1/1] Added sleep support to UART

[Tony Lindgren <tony@atomide.com>]

* Tero.Kristo@nokia.com <Tero.Kristo@nokia.com> [080602 01:09]:
> Hi,
> 
> This patch currently depends on at least one of the PM workaround
> patches from Jouni Hogander. Namely this one:
> 
> [PATCH 07/10] 34XX: PM: Workaround to check whether any fck is active
> before entering sleep
> 
> Sorry I think I forgot to mention this in the patch note. Should we
> change the patch in order to make this one apply cleanly (I could make a
> separate patch for the UART fclk hack which depends on the above?)

Yeah that would be great.

Tony


> 
> -Tero
> 
> >-----Original Message-----
> >From: ext Tony Lindgren [mailto:tony@atomide.com] 
> >Sent: 31 May, 2008 02:02
> >To: Kristo Tero (Nokia-D/Tampere)
> >Cc: linux-omap@vger.kernel.org
> >Subject: Re: [PATCH 1/1] Added sleep support to UART
> >
> >Hi,
> >
> >* Tero Kristo <tero.kristo@nokia.com> [080529 06:07]:
> >> UART usage (e.g. serial console) now denies sleep for 5 
> >seconds. This 
> >> makes it possible to use serial console when dynamic idle is enabled.
> >> 
> >> Also moved code from pm-debug.c to serial.c, and made pm24xx.c use 
> >> this new implementation.
> >
> >The changes for pm34xx.c don't currently apply, can you please 
> >refresh this patch?
> >
> >Thanks,
> >
> >Tony
> >
> >
> >> Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
> >> ---
> >>  arch/arm/mach-omap2/pm-debug.c     |  132 
> >------------------------------------
> >>  arch/arm/mach-omap2/pm.h           |    8 --
> >>  arch/arm/mach-omap2/pm24xx.c       |   53 ++++++++++-----
> >>  arch/arm/mach-omap2/pm34xx.c       |    8 ++-
> >>  arch/arm/mach-omap2/serial.c       |  118 
> >++++++++++++++++++++++++++++++++
> >>  include/asm-arm/arch-omap/common.h |    3 +
> >>  6 files changed, 163 insertions(+), 159 deletions(-)
> >> 
> >> diff --git a/arch/arm/mach-omap2/pm-debug.c 
> >> b/arch/arm/mach-omap2/pm-debug.c index 8a9f3c4..c20fa3b 100644
> >> --- a/arch/arm/mach-omap2/pm-debug.c
> >> +++ b/arch/arm/mach-omap2/pm-debug.c
> >> @@ -34,138 +34,6 @@
> >>  #ifdef CONFIG_PM_DEBUG
> >>  int omap2_pm_debug = 0;
> >>  
> >> -static int serial_console_clock_disabled; -static int 
> >> serial_console_uart; -static unsigned int 
> >serial_console_next_disable;
> >> -
> >> -static struct clk *console_iclk, *console_fclk;
> >> -
> >> -static void serial_console_kick(void) -{
> >> -	serial_console_next_disable = omap2_read_32k_sync_counter();
> >> -	/* Keep the clocks on for 4 secs */
> >> -	serial_console_next_disable += 4 * 32768;
> >> -}
> >> -
> >> -static void serial_wait_tx(void)
> >> -{
> >> -	static const unsigned long uart_bases[3] = {
> >> -		0x4806a000, 0x4806c000, 0x4806e000
> >> -	};
> >> -	unsigned long lsr_reg;
> >> -	int looped = 0;
> >> -
> >> -	/* Wait for TX FIFO and THR to get empty */
> >> -	lsr_reg = IO_ADDRESS(uart_bases[serial_console_uart - 
> >1] + (5 << 2));
> >> -	while ((__raw_readb(lsr_reg) & 0x60) != 0x60)
> >> -		looped = 1;
> >> -	if (looped)
> >> -		serial_console_kick();
> >> -}
> >> -
> >> -u32 omap2_read_32k_sync_counter(void) -{
> >> -        return omap_readl(OMAP2_32KSYNCT_BASE + 0x0010);
> >> -}
> >> -
> >> -void serial_console_fclk_mask(u32 *f1, u32 *f2) -{
> >> -	switch (serial_console_uart)  {
> >> -	case 1:
> >> -		*f1 &= ~(1 << 21);
> >> -		break;
> >> -	case 2:
> >> -		*f1 &= ~(1 << 22);
> >> -		break;
> >> -	case 3:
> >> -		*f2 &= ~(1 << 2);
> >> -		break;
> >> -	}
> >> -}
> >> -
> >> -void serial_console_sleep(int enable) -{
> >> -	if (console_iclk == NULL || console_fclk == NULL)
> >> -		return;
> >> -
> >> -	if (enable) {
> >> -		BUG_ON(serial_console_clock_disabled);
> >> -		if (clk_get_usecount(console_fclk) == 0)
> >> -			return;
> >> -		if ((int) serial_console_next_disable - (int) 
> >omap2_read_32k_sync_counter() >= 0)
> >> -			return;
> >> -		serial_wait_tx();
> >> -		clk_disable(console_iclk);
> >> -		clk_disable(console_fclk);
> >> -		serial_console_clock_disabled = 1;
> >> -	} else {
> >> -		int serial_wakeup = 0;
> >> -		u32 l;
> >> -
> >> -		switch (serial_console_uart)  {
> >> -		case 1:
> >> -			l = prm_read_mod_reg(CORE_MOD, PM_WKST1);
> >> -			if (l & OMAP24XX_ST_UART1)
> >> -				serial_wakeup = 1;
> >> -			break;
> >> -		case 2:
> >> -			l = prm_read_mod_reg(CORE_MOD, PM_WKST1);
> >> -			if (l & OMAP24XX_ST_UART2)
> >> -				serial_wakeup = 1;
> >> -			break;
> >> -		case 3:
> >> -			l = prm_read_mod_reg(CORE_MOD, 
> >OMAP24XX_PM_WKST2);
> >> -			if (l & OMAP24XX_ST_UART3)
> >> -				serial_wakeup = 1;
> >> -			break;
> >> -		}
> >> -		if (serial_wakeup)
> >> -			serial_console_kick();
> >> -		if (!serial_console_clock_disabled)
> >> -			return;
> >> -		clk_enable(console_iclk);
> >> -		clk_enable(console_fclk);
> >> -		serial_console_clock_disabled = 0;
> >> -	}
> >> -}
> >> -
> >> -void pm_init_serial_console(void)
> >> -{
> >> -	const struct omap_serial_console_config *conf;
> >> -	char name[16];
> >> -
> >> -	conf = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
> >> -			       struct omap_serial_console_config);
> >> -	if (conf == NULL)
> >> -		return;
> >> -	if (conf->console_uart > 3 || conf->console_uart < 1)
> >> -		return;
> >> -	serial_console_uart = conf->console_uart;
> >> -	sprintf(name, "uart%d_fck", conf->console_uart);
> >> -	console_fclk = clk_get(NULL, name);
> >> -	if (IS_ERR(console_fclk))
> >> -		console_fclk = NULL;
> >> -	name[6] = 'i';
> >> -	console_iclk = clk_get(NULL, name);
> >> -	if (IS_ERR(console_fclk))
> >> -		console_iclk = NULL;
> >> -	if (console_fclk == NULL || console_iclk == NULL) {
> >> -		serial_console_uart = 0;
> >> -		return;
> >> -	}
> >> -	switch (serial_console_uart) {
> >> -	case 1:
> >> -		prm_set_mod_reg_bits(OMAP24XX_ST_UART1, 
> >CORE_MOD, PM_WKEN1);
> >> -		break;
> >> -	case 2:
> >> -		prm_set_mod_reg_bits(OMAP24XX_ST_UART2, 
> >CORE_MOD, PM_WKEN1);
> >> -		break;
> >> -	case 3:
> >> -		prm_set_mod_reg_bits(OMAP24XX_ST_UART3, 
> >CORE_MOD, OMAP24XX_PM_WKEN2);
> >> -		break;
> >> -	}
> >> -}
> >> -
> >>  #define DUMP_PRM_MOD_REG(mod, reg)    \
> >>  	regs[reg_count].name = #mod "." #reg; \
> >>  	regs[reg_count++].val = prm_read_mod_reg(mod, reg) diff --git 
> >> a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h index 
> >> 351456e..a1a35ea 100644
> >> --- a/arch/arm/mach-omap2/pm.h
> >> +++ b/arch/arm/mach-omap2/pm.h
> >> @@ -20,18 +20,10 @@ extern unsigned short enable_dyn_sleep;  extern 
> >> atomic_t sleep_block;
> >>  
> >>  #ifdef CONFIG_PM_DEBUG
> >> -extern u32 omap2_read_32k_sync_counter(void);
> >>  extern void omap2_pm_dump(int mode, int resume, unsigned int us); 
> >> -extern void serial_console_fclk_mask(u32 *f1, u32 *f2); 
> >-extern void 
> >> pm_init_serial_console(void); -extern void serial_console_sleep(int 
> >> enable);  extern int omap2_pm_debug;  #else -#define 
> >> omap2_read_32k_sync_counter() 0; -#define 
> >serial_console_sleep(enable) 
> >> do; while(0) -#define pm_init_serial_console() do; while(0)  #define 
> >> omap2_pm_dump(mode,resume,us) do; while(0) -#define 
> >> serial_console_fclk_mask(f1,f2)  do; while(0)  #define 
> >omap2_pm_debug 
> >> 0  #endif /* CONFIG_PM_DEBUG */  #endif diff --git 
> >> a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c index 
> >> 5d060de..9bb7ae4 100644
> >> --- a/arch/arm/mach-omap2/pm24xx.c
> >> +++ b/arch/arm/mach-omap2/pm24xx.c
> >> @@ -44,6 +44,7 @@
> >>  #include <asm/arch/mux.h>
> >>  #include <asm/arch/dma.h>
> >>  #include <asm/arch/board.h>
> >> +#include <asm/arch/common.h>
> >>  
> >>  #include "prm.h"
> >>  #include "prm-regbits-24xx.h"
> >> @@ -77,7 +78,9 @@ static int omap2_fclks_active(void)
> >>  
> >>  	f1 = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
> >>  	f2 = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
> >> -	serial_console_fclk_mask(&f1, &f2);
> >> +#ifdef CONFIG_PM_DEBUG
> >> +	omap_serial_fclk_mask(&f1, &f2);
> >> +#endif
> >>  	if (f1 | f2)
> >>  		return 1;
> >>  	return 0;
> >> @@ -85,7 +88,8 @@ static int omap2_fclks_active(void)
> >>  
> >>  static void omap2_enter_full_retention(void)  {
> >> -	u32 l, sleep_time = 0;
> >> +	u32 l = 0;
> >> +	s64 sleep_time = 0;
> >>  
> >>  	/* There is 1 reference hold for all children of the oscillator
> >>  	 * clock, the following will remove it. If no one else 
> >uses the @@ 
> >> -114,29 +118,38 @@ static void omap2_enter_full_retention(void)
> >>  	omap2_gpio_prepare_for_retention();
> >>  
> >>  	if (omap2_pm_debug) {
> >> +		struct timespec t;
> >>  		omap2_pm_dump(0, 0, 0);
> >> -		sleep_time = omap2_read_32k_sync_counter();
> >> +		getnstimeofday(&t);
> >> +		sleep_time = timespec_to_ns(&t);
> >>  	}
> >>  
> >> +#ifdef CONFIG_PM_DEBUG
> >> +	omap_serial_enable_clocks(0);
> >> +#endif
> >> +
> >>  	/* One last check for pending IRQs to avoid extra latency due
> >>  	 * to sleeping unnecessarily. */
> >>  	if (omap_irq_pending())
> >>  		goto no_sleep;
> >>  
> >> -	serial_console_sleep(1);
> >>  	/* Jump to SRAM suspend code */
> >>  	omap2_sram_suspend(OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL));
> >>  no_sleep:
> >> -	serial_console_sleep(0);
> >> +#ifdef CONFIG_PM_DEBUG
> >> +	omap_serial_check_wakeup();
> >> +	omap_serial_enable_clocks(1);
> >> +#endif
> >>  
> >>  	if (omap2_pm_debug) {
> >>  		unsigned long long tmp;
> >> -		u32 resume_time;
> >> +		s64 resume_time;
> >> +		struct timespec t;
> >>  
> >> -		resume_time = omap2_read_32k_sync_counter();
> >> +		getnstimeofday(&t);
> >> +		resume_time = timespec_to_ns(&t);
> >>  		tmp = resume_time - sleep_time;
> >> -		tmp *= 1000000;
> >> -		omap2_pm_dump(0, 1, tmp / 32768);
> >> +		omap2_pm_dump(0, 1, tmp / 1000);
> >>  	}
> >>  	omap2_gpio_resume_after_retention();
> >>  
> >> @@ -195,7 +208,7 @@ static int omap2_allow_mpu_retention(void)
> >>  
> >>  static void omap2_enter_mpu_retention(void)  {
> >> -	u32 sleep_time = 0;
> >> +	s64 sleep_time = 0;
> >>  	int only_idle = 0;
> >>  
> >>  	/* Putting MPU into the WFI state while a transfer is active @@ 
> >> -223,20 +236,24 @@ static void omap2_enter_mpu_retention(void)
> >>  	}
> >>  
> >>  	if (omap2_pm_debug) {
> >> +		struct timespec t;
> >> +
> >>  		omap2_pm_dump(only_idle ? 2 : 1, 0, 0);
> >> -		sleep_time = omap2_read_32k_sync_counter();
> >> +		getnstimeofday(&t);
> >> +		sleep_time = timespec_to_ns(&t);
> >>  	}
> >>  
> >>  	omap2_sram_idle();
> >>  
> >>  	if (omap2_pm_debug) {
> >>  		unsigned long long tmp;
> >> -		u32 resume_time;
> >> +		s64 resume_time;
> >> +		struct timespec t;
> >>  
> >> -		resume_time = omap2_read_32k_sync_counter();
> >> +		getnstimeofday(&t);
> >> +		resume_time = timespec_to_ns(&t);
> >>  		tmp = resume_time - sleep_time;
> >> -		tmp *= 1000000;
> >> -		omap2_pm_dump(only_idle ? 2 : 1, 1, tmp / 32768);
> >> +		omap2_pm_dump(only_idle ? 2 : 1, 1, tmp / 1000);
> >>  	}
> >>  }
> >>  
> >> @@ -252,6 +269,10 @@ static int omap2_can_sleep(void)
> >>  		return 0;
> >>  	if (omap_dma_running())
> >>  		return 0;
> >> +#ifdef CONFIG_PM_DEBUG
> >> +	if (!omap_serial_can_sleep())
> >> +		return 0;
> >> +#endif
> >>  
> >>  	return 1;
> >>  }
> >> @@ -516,8 +537,6 @@ int __init omap2_pm_init(void)
> >>  
> >>  	prcm_setup_regs();
> >>  
> >> -	pm_init_serial_console();
> >> -
> >>  	/* Hack to prevent MPU retention when STI console is enabled. */
> >>  	{
> >>  		const struct omap_sti_console_config *sti; diff --git 
> >> a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 
> >> abe5cb4..5b68dae 100644
> >> --- a/arch/arm/mach-omap2/pm34xx.c
> >> +++ b/arch/arm/mach-omap2/pm34xx.c
> >> @@ -94,6 +94,9 @@ static irqreturn_t prcm_interrupt_handler 
> >(int irq, void *dev_id)
> >>  	u32 wkst, irqstatus_mpu;
> >>  	u32 fclk, iclk;
> >>  
> >> +	/* Check if we woke up to serial console activity */
> >> +	omap_serial_check_wakeup();
> >> +
> >>  	/* WKUP */
> >>  	wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
> >>  	if (wkst) {
> >> @@ -242,8 +245,7 @@ static int omap3_fclks_active(void)
> >>  	fck_per = cm_read_mod_reg(OMAP3430_PER_MOD,
> >>  				  CM_FCLKEN);
> >>  	gpio_fclk_mask(&fck_per);
> >> -	fck_core1 &= ~(0x3 << 13);
> >> -	fck_per &= ~(0x1 << 11);
> >> +	omap_serial_fclk_mask(&fck_core1, &fck_per);
> >>  	if (fck_core1 | fck_core3 | fck_sgx | fck_dss |
> >>  	    fck_cam | fck_per | fck_usbhost)
> >>  		return 1;
> >> @@ -258,6 +260,8 @@ static int omap3_can_sleep(void)
> >>  		return 0;
> >>  	if (atomic_read(&sleep_block) > 0)
> >>  		return 0;
> >> +	if (!omap_serial_can_sleep())
> >> +		return 0;
> >>  	return 1;
> >>  }
> >>  
> >> diff --git a/arch/arm/mach-omap2/serial.c 
> >> b/arch/arm/mach-omap2/serial.c index b0fa582..65571f9 100644
> >> --- a/arch/arm/mach-omap2/serial.c
> >> +++ b/arch/arm/mach-omap2/serial.c
> >> @@ -23,8 +23,47 @@
> >>  #include <asm/arch/common.h>
> >>  #include <asm/arch/board.h>
> >>  
> >> +#include "prm.h"
> >> +#include "pm.h"
> >> +
> >> +#define SERIAL_AWAKE_TIME 5
> >> +
> >>  static struct clk *uart_ick[OMAP_MAX_NR_PORTS];  static struct clk 
> >> *uart_fck[OMAP_MAX_NR_PORTS];
> >> +static s64 omap_serial_next_sleep;
> >> +
> >> +static const u32 omap2_uart_wk_st[OMAP_MAX_NR_PORTS] = {
> >> +	PM_WKST1, PM_WKST1, OMAP24XX_PM_WKST2 }; static const u32 
> >> +omap2_uart_wk_en[OMAP_MAX_NR_PORTS] = {
> >> +	PM_WKEN1, PM_WKEN1, OMAP24XX_PM_WKEN2 }; const u32 
> >> +omap2_uart_wk_bit[OMAP_MAX_NR_PORTS] = {
> >> +	OMAP24XX_ST_UART1, OMAP24XX_ST_UART2, OMAP24XX_ST_UART3 };
> >> +
> >> +#if defined(CONFIG_ARCH_OMAP2)
> >> +static const u32 omap_uart_fclk_mask[OMAP_MAX_NR_PORTS] = {
> >> +	OMAP24XX_EN_UART1, OMAP24XX_EN_UART2, OMAP24XX_EN_UART3 
> >}; #endif
> >> +
> >> +#if defined(CONFIG_ARCH_OMAP3)
> >> +static const u32 omap_uart_fclk_mask[OMAP_MAX_NR_PORTS] = {
> >> +	OMAP3430_EN_UART1, OMAP3430_EN_UART2, OMAP3430_EN_UART3 };
> >> +
> >> +/* UART padconfig registers, these may differ if 
> >non-default padconfig
> >> +   is used */
> >> +#define CONTROL_PADCONF_UART1_RX 0x48002182 #define 
> >> +CONTROL_PADCONF_UART2_RX 0x4800217A #define 
> >CONTROL_PADCONF_UART3_RX 
> >> +0x4800219E #define PADCONF_WAKEUP_ST 0x8000
> >> +
> >> +static const u32 omap_uart_padconf[OMAP_MAX_NR_PORTS] = {
> >> +	CONTROL_PADCONF_UART1_RX, CONTROL_PADCONF_UART2_RX, 
> >> +CONTROL_PADCONF_UART3_RX }; #endif
> >>  
> >>  static struct plat_serial8250_port serial_platform_data[] = {
> >>  	{
> >> @@ -83,6 +122,15 @@ static inline void __init 
> >omap_serial_reset(struct plat_serial8250_port *p)
> >>  	serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 
> >2) | (1 << 
> >> 0));  }
> >>  
> >> +static void omap_serial_kick(void)
> >> +{
> >> +	struct timespec t;
> >> +
> >> +	getnstimeofday(&t);
> >> +	omap_serial_next_sleep = timespec_to_ns(&t) +
> >> +		(s64)SERIAL_AWAKE_TIME * (s64)1000000000; }
> >> +
> >>  void omap_serial_enable_clocks(int enable)  {
> >>  	int i;
> >> @@ -99,6 +147,71 @@ void omap_serial_enable_clocks(int enable)
> >>  	}
> >>  }
> >>  
> >> +void omap_serial_fclk_mask(u32 *f1, u32 *f2) {
> >> +	if (uart_ick[0])
> >> +		*f1 &= ~omap_uart_fclk_mask[0];
> >> +	if (uart_ick[1])
> >> +		*f1 &= ~omap_uart_fclk_mask[1];
> >> +	if (uart_ick[2])
> >> +		*f2 &= ~omap_uart_fclk_mask[2];
> >> +}
> >> +
> >> +void omap_serial_check_wakeup(void)
> >> +{
> >> +	int i;
> >> +
> >> +	if (cpu_is_omap34xx())
> >> +		for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
> >> +			if (!uart_ick[i])
> >> +				continue;
> >> +			if (omap_readw(omap_uart_padconf[i]) & 
> >PADCONF_WAKEUP_ST)
> >> +				omap_serial_kick();
> >> +				return;
> >> +		}
> >> +
> >> +	if (cpu_is_omap24xx()) {
> >> +		u32 l;
> >> +
> >> +		for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
> >> +			if (!uart_ick[i])
> >> +				continue;
> >> +			l = prm_read_mod_reg(CORE_MOD, 
> >omap2_uart_wk_st[i]);
> >> +			if (l & omap2_uart_wk_bit[i])
> >> +				omap_serial_kick();
> >> +				return;
> >> +		}
> >> +	}
> >> +}
> >> +
> >> +int omap_serial_can_sleep(void)
> >> +{
> >> +	s64 cnt;
> >> +	int i;
> >> +	struct timespec t;
> >> +
> >> +	struct plat_serial8250_port *p = serial_platform_data;
> >> +
> >> +	getnstimeofday(&t);
> >> +	cnt = timespec_to_ns(&t);
> >> +
> >> +	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
> >> +		if (!uart_ick[i])
> >> +			continue;
> >> +		/* Check if we have data in the transmit buffer */
> >> +		if ((serial_read_reg(p + i, UART_LSR) & 
> >(UART_LSR_TEMT|UART_LSR_THRE))
> >> +			!= (UART_LSR_TEMT|UART_LSR_THRE)) {
> >> +				omap_serial_kick();
> >> +				return 0;
> >> +		}
> >> +	}
> >> +
> >> +	if (omap_serial_next_sleep - cnt >= 0)
> >> +		return 0;
> >> +
> >> +	return 1;
> >> +}
> >> +
> >>  void __init omap_serial_init(void)
> >>  {
> >>  	int i;
> >> @@ -142,7 +255,12 @@ void __init omap_serial_init(void)
> >>  			clk_enable(uart_fck[i]);
> >>  
> >>  		omap_serial_reset(p);
> >> +
> >> +		if (cpu_is_omap24xx())
> >> +			
> >prm_set_mod_reg_bits(omap2_uart_wk_bit[i], CORE_MOD, 
> >> +omap2_uart_wk_en[i]);
> >>  	}
> >> +
> >> +	omap_serial_kick();
> >>  }
> >>  
> >>  static struct platform_device serial_device = { diff --git 
> >> a/include/asm-arm/arch-omap/common.h 
> >> b/include/asm-arm/arch-omap/common.h
> >> index 6c072de..68894f9 100644
> >> --- a/include/asm-arm/arch-omap/common.h
> >> +++ b/include/asm-arm/arch-omap/common.h
> >> @@ -35,6 +35,9 @@ extern void omap_map_common_io(void);  
> >extern struct 
> >> sys_timer omap_timer;  extern void omap_serial_init(void);  extern 
> >> void omap_serial_enable_clocks(int enable);
> >> +extern int omap_serial_can_sleep(void); extern void 
> >> +omap_serial_fclk_mask(u32 *f1, u32 *f2); void 
> >> +omap_serial_check_wakeup(void);
> >>  #ifdef CONFIG_I2C_OMAP
> >>  extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
> >>  				 struct i2c_board_info const *info,
> >> --
> >> 1.5.4.3
> >> 
> >> --
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> >> in the body of a message to majordomo@vger.kernel.org More majordomo 
> >> info at  http://vger.kernel.org/majordomo-info.html
> >