IMX_MU_RSR
status = imx_mu_read(msi_data, msi_data->cfg->xSR[IMX_MU_RSR]);
[IMX_MU_RSR] = 0x20,
[IMX_MU_RSR] = 0x60,
[IMX_MU_RSR] = 0x12C,
status = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_RSR], xsr,
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);