linux-kernel - Re: [PATCH] mfd: lpc_ich: Separate device cells for clarity

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Message-ID: <20150919101606.GS3218@x1>
Date:	Sat, 19 Sep 2015 11:16:06 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Aaron Sierra <asierra@...-inc.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Tyser <ptyser@...-inc.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH] mfd: lpc_ich: Separate device cells for clarity

On Thu, 03 Sep 2015, Aaron Sierra wrote:

> The lpc_ich_cells array gives the wrong impression about the
> relationship between the watchdog and GPIO devices. They are
> completely distinct devices, so this patch separates the
> array into distinct mfd_cell structs per device.

What does this mean?  In what way are they distinct?

> A side effect of removing the array, is that the lpc_cells enum
> is no longer needed.
> 
> Signed-off-by: Aaron Sierra <asierra@...-inc.com>
> ---
>  drivers/mfd/lpc_ich.c | 42 ++++++++++++++++++------------------------
>  1 file changed, 18 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> index 8de3439..7a01d430 100644
> --- a/drivers/mfd/lpc_ich.c
> +++ b/drivers/mfd/lpc_ich.c
> @@ -131,24 +131,18 @@ static struct resource gpio_ich_res[] = {
>  	},
>  };
>  
> -enum lpc_cells {
> -	LPC_WDT = 0,
> -	LPC_GPIO,
> +static struct mfd_cell lpc_ich_wdt_cell = {
> +	.name = "iTCO_wdt",
> +	.num_resources = ARRAY_SIZE(wdt_ich_res),
> +	.resources = wdt_ich_res,
> +	.ignore_resource_conflicts = true,
>  };
>  
> -static struct mfd_cell lpc_ich_cells[] = {
> -	[LPC_WDT] = {
> -		.name = "iTCO_wdt",
> -		.num_resources = ARRAY_SIZE(wdt_ich_res),
> -		.resources = wdt_ich_res,
> -		.ignore_resource_conflicts = true,
> -	},
> -	[LPC_GPIO] = {
> -		.name = "gpio_ich",
> -		.num_resources = ARRAY_SIZE(gpio_ich_res),
> -		.resources = gpio_ich_res,
> -		.ignore_resource_conflicts = true,
> -	},
> +static struct mfd_cell lpc_ich_gpio_cell = {
> +	.name = "gpio_ich",
> +	.num_resources = ARRAY_SIZE(gpio_ich_res),
> +	.resources = gpio_ich_res,
> +	.ignore_resource_conflicts = true,
>  };
>  
>  /* chipset related info */
> @@ -881,7 +875,7 @@ static int lpc_ich_init_gpio(struct pci_dev *dev)
>  	base_addr = base_addr_cfg & 0x0000ff80;
>  	if (!base_addr) {
>  		dev_notice(&dev->dev, "I/O space for ACPI uninitialized\n");
> -		lpc_ich_cells[LPC_GPIO].num_resources--;
> +		lpc_ich_gpio_cell.num_resources--;
>  		goto gpe0_done;
>  	}
>  
> @@ -895,7 +889,7 @@ static int lpc_ich_init_gpio(struct pci_dev *dev)
>  		 * the platform_device subsystem doesn't see this resource
>  		 * or it will register an invalid region.
>  		 */
> -		lpc_ich_cells[LPC_GPIO].num_resources--;
> +		lpc_ich_gpio_cell.num_resources--;
>  		acpi_conflict = true;
>  	} else {
>  		lpc_ich_enable_acpi_space(dev);
> @@ -933,14 +927,14 @@ gpe0_done:
>  	lpc_chipset_info[priv->chipset].use_gpio = ret;
>  	lpc_ich_enable_gpio_space(dev);
>  
> -	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_GPIO]);
> +	lpc_ich_finalize_cell(dev, &lpc_ich_gpio_cell);
>  	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
> -			      &lpc_ich_cells[LPC_GPIO], 1, NULL, 0, NULL);
> +			      &lpc_ich_gpio_cell, 1, NULL, 0, NULL);
>  
>  gpio_done:
>  	if (acpi_conflict)
>  		pr_warn("Resource conflict(s) found affecting %s\n",
> -				lpc_ich_cells[LPC_GPIO].name);
> +				lpc_ich_gpio_cell.name);
>  	return ret;
>  }
>  
> @@ -984,7 +978,7 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
>  	 */
>  	if (lpc_chipset_info[priv->chipset].iTCO_version == 1) {
>  		/* Don't register iomem for TCO ver 1 */
> -		lpc_ich_cells[LPC_WDT].num_resources--;
> +		lpc_ich_wdt_cell.num_resources--;
>  	} else if (lpc_chipset_info[priv->chipset].iTCO_version == 2) {
>  		pci_read_config_dword(dev, RCBABASE, &base_addr_cfg);
>  		base_addr = base_addr_cfg & 0xffffc000;
> @@ -1007,9 +1001,9 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
>  		res->end = base_addr + ACPIBASE_PMC_END;
>  	}
>  
> -	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_WDT]);
> +	lpc_ich_finalize_cell(dev, &lpc_ich_wdt_cell);
>  	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
> -			      &lpc_ich_cells[LPC_WDT], 1, NULL, 0, NULL);
> +			      &lpc_ich_wdt_cell, 1, NULL, 0, NULL);
>  
>  wdt_done:
>  	return ret;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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