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

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Message-ID: <20150609073249.GF2982@x1>
Date:	Tue, 9 Jun 2015 08:32:49 +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] mfd: lpc_ich: Assign subdevice ids automatically

On Fri, 08 May 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 -2 as a platform device id. This makes the platform
> device core to allocate new ids automatically.

Please use the defines provided in:
 
  include/linux/platform_device.h
 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  drivers/mfd/lpc_ich.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> index 12d960a60ec4..c211cf361680 100644
> --- a/drivers/mfd/lpc_ich.c
> +++ b/drivers/mfd/lpc_ich.c
> @@ -934,7 +934,7 @@ 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],
> +	ret = mfd_add_devices(&dev->dev, -2, &lpc_ich_cells[LPC_GPIO],
>  			      1, NULL, 0, NULL);
>  
>  gpio_done:
> @@ -1008,7 +1008,7 @@ 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],
> +	ret = mfd_add_devices(&dev->dev, -2, &lpc_ich_cells[LPC_WDT],
>  			      1, NULL, 0, NULL);
>  
>  wdt_done:

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