Re: [PATCH 3/7] drivers: soc: xilinx: add check for platform

[Greg KH]

On Fri, Sep 29, 2023 at 03:55:54AM -0700, Jay Buddhabhatti wrote:
> Some error event IDs for Versal and Versal NET are different.
> Both the platforms should access their respective error event
> IDs so use sub_family_code to check for platform and check
> error IDs for respective platforms. The family code is passed
> via platform data to avoid platform detection again.
> Platform data is setup when even driver is registered.
> 
> Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@xxxxxxx>
> ---
>  drivers/firmware/xilinx/zynqmp.c        |  2 +-
>  drivers/soc/xilinx/xlnx_event_manager.c | 25 ++++++++++++++++++++-----
>  include/linux/firmware/xlnx-zynqmp.h    | 16 ++++++++++++----
>  3 files changed, 33 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 5f40288f69a9..6583efa9ac48 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -2019,7 +2019,7 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
>  	np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
>  	if (np) {
>  		em_dev = platform_device_register_data(&pdev->dev, "xlnx_event_manager",
> -						       -1, NULL, 0);
> +						       -1, &pm_sub_family_code, 4);
>  		if (IS_ERR(em_dev))
>  			dev_err_probe(&pdev->dev, PTR_ERR(em_dev), "EM register fail with error\n");
>  	}
> diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
> index 38cfc161a713..8074ded7b39c 100644
> --- a/drivers/soc/xilinx/xlnx_event_manager.c
> +++ b/drivers/soc/xilinx/xlnx_event_manager.c
> @@ -23,6 +23,7 @@ static DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number1);
>  
>  static int virq_sgi;
>  static int event_manager_availability = -EACCES;
> +static u32 pm_sub_family_code;

Why is this not a per-device variable?  Global variables like this for
drivers are almost always wrong.

thanks,

greg k-h