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All calls to rsmu_write_page_register() have resulted in early return, becase all addresses in include/linux/mfd/idt8a340_reg.h are less than RSMU_CM_SCSR_BASE. There were 2 separate patch series which have to be merged in one time: mfd and ptp. The latter have been merged, the former[1] have not. Link: https://lore.kernel.org/netdev/LV3P220MB1202F8E2FCCFBA2519B4966EA0192@LV3P220MB1202.NAMP220.PROD.OUTLOOK.COM/ Fixes: 67d6c76fc815 ("mfd: rsmu: Support 32-bit address space") Signed-off-by: Matthew Bystrin --- drivers/mfd/rsmu_spi.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/mfd/rsmu_spi.c b/drivers/mfd/rsmu_spi.c index 39d9be1e141f..55c5698e7e77 100644 --- a/drivers/mfd/rsmu_spi.c +++ b/drivers/mfd/rsmu_spi.c @@ -101,11 +101,9 @@ static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg) switch (rsmu->type) { case RSMU_CM: - /* Do not modify page register for none-scsr registers */ - if (reg < RSMU_CM_SCSR_BASE) - return 0; page_reg = RSMU_CM_PAGE_ADDR; page = reg & RSMU_PAGE_MASK; + page |= RSMU_CM_SCSR_BASE; buf[0] = (u8)(page & 0xFF); buf[1] = (u8)((page >> 8) & 0xFF); buf[2] = (u8)((page >> 16) & 0xFF); -- 2.53.0