Subject: [PATCH v2 1/7 v2] ARM: OMAP1: ams-delta: register latch dependent devices later

From: [email-masked] (Tony Lindgren)
Date: Wed, 21 Dec 2011 11:08:15 -0800

* Janusz Krzysztofik <[email-masked]> [111220 13:23]:
> In preparation to converting Amstrad Delta on-board latches to
> basic_mmio_gpio devices, registration of platform devices which depend
> on latches and will require initialization of their GPIO pins first,
> should be moved out of .machine_init down to late_initcall level, as the
> gpio-generic driver is not available until device_initcall time.  The
> latch reset operation, which will be replaced with GPIO initialization,
> must also be moved to late_initcall for the same reason.
> 
> Since there was already another, separate arch_initcall function for
> setting up one of those latch dependent devices, the on-board modem
> device, reuse that function, i.e., rename it to a name that matches the
> new purpose, extend with other device setup relocated from
> .machine_init, and move down to the late_initcall level.
> 
> While being at it, add missing gpio_free() in case the modem platform
> device registration fails.
> 
> Thanks to Tony Lindgren <[email-masked]> who suggested this approach
> instead of shifting up the gpio-generic driver initialization.
> 
> In addition, defer registration of the Amstrad Delta ASoC and serio
> devices, done from their device driver files, until late_initcall time,
> as those drivers will depend on their GPIO pins already requested from
> the board late_init() function until updated to register their GPIO pins
> themselves.
> 
> Created and tested against linux-3.2-rc6.
> 
> Signed-off-by: Janusz Krzysztofik <[email-masked]>

Planning to apply this series. Dmitry, care to ack the drivers/input/serio/
related change?

Regards,

Tony

> ---
> Changes since the initial version of this patch:
> * use late_initcall() unconditionally in modules, requested by Russell
>   King (thanks!); an updated patch 7/7 will follow,
> * in the changelog message, move credits to Tony up a bit, since the
>   person responsible for other changes (he might not necessarily like)
>   is me, not him ;).
> 
> Comments copied from this patch initial submission:
> This patch was not present in the initial submission, it replaces the
> old patch 1/10, providing an alternative solution not touching the
> gpio-generic driver.
> 
>  arch/arm/mach-omap1/board-ams-delta.c |   28 ++++++++++++++++++++--------
>  drivers/input/serio/ams_delta_serio.c |    2 +-
>  sound/soc/omap/ams-delta.c            |    2 +-
>  3 files changed, 22 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index b0f15d2..50987c9 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -275,11 +275,14 @@ static struct omap1_cam_platform_data ams_delta_camera_platform_data = {
>  };
>  
>  static struct platform_device *ams_delta_devices[] __initdata = {
> -	&ams_delta_nand_device,
>  	&ams_delta_kp_device,
> +	&ams_delta_camera_device,
> +};
> +
> +static struct platform_device *late_devices[] __initdata = {
> +	&ams_delta_nand_device,
>  	&ams_delta_lcd_device,
>  	&ams_delta_led_device,
> -	&ams_delta_camera_device,
>  };
>  
>  static void __init ams_delta_init(void)
> @@ -307,9 +310,6 @@ static void __init ams_delta_init(void)
>  	omap_serial_init();
>  	omap_register_i2c_bus(1, 100, NULL, 0);
>  
> -	/* Clear latch2 (NAND, LCD, modem enable) */
> -	ams_delta_latch2_write(~0, 0);
> -
>  	omap1_usb_init(&ams_delta_usb_config);
>  	omap1_set_camera_info(&ams_delta_camera_platform_data);
>  #ifdef CONFIG_LEDS_TRIGGERS
> @@ -345,13 +345,18 @@ static struct platform_device ams_delta_modem_device = {
>  	},
>  };
>  
> -static int __init ams_delta_modem_init(void)
> +static int __init late_init(void)
>  {
>  	int err;
>  
>  	if (!machine_is_ams_delta())
>  		return -ENODEV;
>  
> +	/* Clear latch2 (NAND, LCD, modem enable) */
> +	ams_delta_latch2_write(~0, 0);
> +
> +	platform_add_devices(late_devices, ARRAY_SIZE(late_devices));
> +
>  	omap_cfg_reg(M14_1510_GPIO2);
>  	ams_delta_modem_ports[0].irq =
>  			gpio_to_irq(AMS_DELTA_GPIO_PIN_MODEM_IRQ);
> @@ -367,9 +372,16 @@ static int __init ams_delta_modem_init(void)
>  		AMS_DELTA_LATCH2_MODEM_NRESET | AMS_DELTA_LATCH2_MODEM_CODEC,
>  		AMS_DELTA_LATCH2_MODEM_NRESET | AMS_DELTA_LATCH2_MODEM_CODEC);
>  
> -	return platform_device_register(&ams_delta_modem_device);
> +	err = platform_device_register(&ams_delta_modem_device);
> +	if (err)
> +		goto gpio_free;
> +	return 0;
> +
> +gpio_free:
> +	gpio_free(AMS_DELTA_GPIO_PIN_MODEM_IRQ);
> +	return err;
>  }
> -arch_initcall(ams_delta_modem_init);
> +late_initcall(late_init);
>  
>  static void __init ams_delta_map_io(void)
>  {
> diff --git a/drivers/input/serio/ams_delta_serio.c b/drivers/input/serio/ams_delta_serio.c
> index d4d08bd..835d37a 100644
> --- a/drivers/input/serio/ams_delta_serio.c
> +++ b/drivers/input/serio/ams_delta_serio.c
> @@ -165,7 +165,7 @@ serio:
>  	kfree(ams_delta_serio);
>  	return err;
>  }
> -module_init(ams_delta_serio_init);
> +late_initcall(ams_delta_serio_init);
>  
>  static void __exit ams_delta_serio_exit(void)
>  {
> diff --git a/sound/soc/omap/ams-delta.c b/sound/soc/omap/ams-delta.c
> index ccb8a6a..be81bc7 100644
> --- a/sound/soc/omap/ams-delta.c
> +++ b/sound/soc/omap/ams-delta.c
> @@ -636,7 +636,7 @@ err:
>  	platform_device_put(ams_delta_audio_platform_device);
>  	return ret;
>  }
> -module_init(ams_delta_module_init);
> +late_initcall(ams_delta_module_init);
>  
>  static void __exit ams_delta_module_exit(void)
>  {
> -- 
> 1.7.3.4
>