linux-kernel - Re: [PATCH v2] mfd: lpc_ich: Assign subdevice ids automatically

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Message-ID: <20150609110905.GS2982@x1>
Date:	Tue, 9 Jun 2015 12:09:05 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Peter Tyser <ptyser@...-inc.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mfd: lpc_ich: Assign subdevice ids automatically

On Tue, 09 Jun 2015, Mika Westerberg wrote:

> Using -1 as platform device id means that the platform driver core will not
> assign any id to the device (the device name will not have id at all). This
> results problems on systems that have multiple PCHs (Platform Controller
> HUBs) because all of them also include their own copy of LPC device.
> 
> All the subsequent device creations will fail because there already exists
> platform device with the same name.
> 
> Fix this by passing PLATFORM_DEVID_AUTO as platform device id. This makes
> the platform device core to allocate new ids automatically.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
> v1 -> v2: Use PLATFORM_DEVID_AUTO instead of -2 as suggested by Lee
> 
>  drivers/mfd/lpc_ich.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> index 12d960a60ec4..8de34398abc0 100644
> --- a/drivers/mfd/lpc_ich.c
> +++ b/drivers/mfd/lpc_ich.c
> @@ -934,8 +934,8 @@ gpe0_done:
>  	lpc_ich_enable_gpio_space(dev);
>  
>  	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_GPIO]);
> -	ret = mfd_add_devices(&dev->dev, -1, &lpc_ich_cells[LPC_GPIO],
> -			      1, NULL, 0, NULL);
> +	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
> +			      &lpc_ich_cells[LPC_GPIO], 1, NULL, 0, NULL);
>  
>  gpio_done:
>  	if (acpi_conflict)
> @@ -1008,8 +1008,8 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
>  	}
>  
>  	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_WDT]);
> -	ret = mfd_add_devices(&dev->dev, -1, &lpc_ich_cells[LPC_WDT],
> -			      1, NULL, 0, NULL);
> +	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
> +			      &lpc_ich_cells[LPC_WDT], 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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