[PATCH] mfd: lpc_ich: Assign subdevice ids automatically

[PATCH] mfd: lpc_ich: Assign subdevice ids automatically

[Mika Westerberg]

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.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.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:
-- 
2.1.4

Re: [PATCH] mfd: lpc_ich: Assign subdevice ids automatically

[Mika Westerberg]

Ping on this.

On Fri, May 08, 2015 at 02:31:30PM +0300, 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.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.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:
> -- 
> 2.1.4

Re: [PATCH] mfd: lpc_ich: Assign subdevice ids automatically

[Lee Jones]

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@linux.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
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