Re: [PATCH 3/3] ARM: OMAP2+: Add SSI driver configuration

[Tony Lindgren <tony@atomide.com>]

* Sebastian Reichel <sre@debian.org> [130811 09:25]:
> From: Sebastian Reichel <sre@ring0.de>
> 
> This patch configures and activates the OMAP SSI driver on the RX-51.

Hmm, I'd rather see this be DT only driver at this point. We're pretty
close to flipping omap3 to be DT only, and I'd rather not add new
platform code at this point. With DT, none of this patch is needed,
you can do all this in the driver probe based on the .dts configuration.

Regards,

Tony

>  arch/arm/mach-omap2/Makefile                 |    4 ++
>  arch/arm/mach-omap2/board-rx51-peripherals.c |   10 +++-
>  arch/arm/mach-omap2/ssi.c                    |   82 ++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/mach-omap2/ssi.c
> 
> diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
> index d4f6715..ace860d 100644
> --- a/arch/arm/mach-omap2/Makefile
> +++ b/arch/arm/mach-omap2/Makefile
> @@ -222,6 +222,10 @@ ifneq ($(CONFIG_DRM_OMAP),)
>  obj-y					+= drm.o
>  endif
>  
> +# Synchronous Serial Interface (SSI)
> +omap-ssi-$(CONFIG_OMAP_SSI)		:= ssi.o
> +obj-y					+= $(omap-ssi-m) $(omap-ssi-y)
> +
>  # Specific board support
>  obj-$(CONFIG_MACH_OMAP_GENERIC)		+= board-generic.o
>  obj-$(CONFIG_MACH_OMAP_H4)		+= board-h4.o
> diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c b/arch/arm/mach-omap2/board-rx51-peripherals.c
> index 9c2dd10..e2ca155 100644
> --- a/arch/arm/mach-omap2/board-rx51-peripherals.c
> +++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
> @@ -27,6 +27,7 @@
>  #include <linux/power/isp1704_charger.h>
>  #include <linux/platform_data/spi-omap2-mcspi.h>
>  #include <linux/platform_data/mtd-onenand-omap2.h>
> +#include <linux/platform_data/hsi-omap-ssi.h>
>  
>  #include <asm/system_info.h>
>  
> @@ -73,6 +74,8 @@
>  #define LIS302_IRQ1_GPIO 181
>  #define LIS302_IRQ2_GPIO 180  /* Not yet in use */
>  
> +#define RX51_CAWAKE_GPIO 151
> +
>  /* List all SPI devices here. Note that the list/probe order seems to matter! */
>  enum {
>  	RX51_SPI_WL1251,
> @@ -265,6 +268,11 @@ static struct spi_board_info rx51_peripherals_spi_board_info[] __initdata = {
>  	},
>  };
>  
> +static struct omap_ssi_board_config ssi_board_config = {
> +	.num_ports = 1,
> +	.cawake_gpio = { RX51_CAWAKE_GPIO },
> +};
> +
>  static struct platform_device rx51_battery_device = {
>  	.name	= "rx51-battery",
>  	.id	= -1,
> @@ -1295,7 +1303,7 @@ void __init rx51_peripherals_init(void)
>  	if (partition)
>  		omap_hsmmc_init(mmc);
>  
> +	omap_ssi_config(&ssi_board_config);
>  	rx51_charger_init();
>  	rx51_init_twl4030_hwmon();
>  }
> -
> diff --git a/arch/arm/mach-omap2/ssi.c b/arch/arm/mach-omap2/ssi.c
> new file mode 100644
> index 0000000..a9d6eee
> --- /dev/null
> +++ b/arch/arm/mach-omap2/ssi.c
> @@ -0,0 +1,82 @@
> +/*
> + * linux/arch/arm/mach-omap2/ssi.c
> + *
> + * Copyright (C) 2010 Nokia Corporation. All rights reserved.
> + *
> + * Contact: Carlos Chinea <carlos.chinea@nokia.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/platform_data/hsi-omap-ssi.h>
> +#include "omap_hwmod.h"
> +#include "omap_device.h"
> +#include "omap-pm.h"
> +
> +static struct omap_ssi_platform_data ssi_pdata = {
> +	.num_ports      = SSI_NUM_PORTS,
> +	.cawake_gpio    = {0},
> +	.get_dev_context_loss_count  = omap_pm_get_dev_context_loss_count,
> +};
> +
> +int __init omap_ssi_config(struct omap_ssi_board_config *ssi_config)
> +{
> +	unsigned int port, offset, cawake_gpio;
> +	int err;
> +
> +	ssi_pdata.num_ports = ssi_config->num_ports;
> +
> +	for (port = 0, offset = 7; port < ssi_config->num_ports; port++, offset += 5) {
> +		cawake_gpio = ssi_config->cawake_gpio[port];
> +		if (!cawake_gpio)
> +			continue; /* Nothing to do */
> +		err = gpio_request(cawake_gpio, "cawake");
> +		if (err < 0)
> +			goto rback;
> +		gpio_direction_input(cawake_gpio);
> +
> +		ssi_pdata.cawake_gpio[port] = ssi_config->cawake_gpio[port];
> +	}
> +
> +	return 0;
> +
> +rback:
> +	pr_err("omap-ssi: Request cawake (gpio%d) failed\n", cawake_gpio);
> +	while (port > 0)
> +		gpio_free(ssi_config->cawake_gpio[--port]);
> +
> +	return err;
> +}
> +
> +static int __init omap_ssi_init(void)
> +{
> +	struct omap_hwmod *oh;
> +	struct platform_device *pdev;
> +
> +	oh = omap_hwmod_lookup("ssi");
> +	if (!oh)
> +		return -EINVAL;
> +
> +	pdev = omap_device_build("omap_ssi", 0, oh, &ssi_pdata, sizeof(struct omap_ssi_platform_data));
> +	WARN(IS_ERR(pdev), "Can't build omap_device for omap_ssi\n");
> +
> +	return 0;
> +}
> +subsys_initcall(omap_ssi_init);
> -- 
> 1.7.10.4
> 
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