mfd: altera-sysmgr: enable raw spinlock feature for preempt-rt kernel
When booting up preempt rt kernel on stratix10 platform, there is below calltrace: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:969 in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 1, name: swapper/0 Preemption disabled at: [<ffff8000100b25b0>] __setup_irq+0xe0/0x730 CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.10.78-rt54-yocto-preempt-rt #1 Hardware name: SoCFPGA Stratix 10 SoCDK (DT) Call trace: ...... ___might_sleep+0x144/0x180 rt_spin_lock+0x34/0x9c regmap_lock_spinlock+0x24/0x40 regmap_write+0x48/0x84 a10_eccmgr_irq_unmask+0x34/0x40 ...... altr_edac_a10_probe+0x16c/0x2b0 platform_drv_probe+0x60/0xb4 ...... ret_from_fork+0x10/0x38 Because regmap_write is invoked under preemption disabled status, and might trigger sleep. Recently, the commit 67021f25("regmap: teach regmap to use raw spinlocks if requested in the config ") add an option for regmap to use raw spinlock. So, enable raw spinlock in preempt-rt kernel to avoid the might sleep issue. Note: The commit 67021f25 is only in kernel v5.15, not included in earlier versions. So, if intend to fix this issue in earlier preempt-rt kernel, it is need to backport the 2 patches together, otherwise there will be building issue. Signed-off-by:Meng Li <Meng.Li@windriver.com> Signed-off-by: