firmware: xilinx: Add DLL reset support

SD DLL resets are required for some of the operations on ZynqMP platform.
Add DLL reset support in ZynqMP firmware driver for SD DLL reset.
Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/1579602095-30060-3-git-send-email-manish.narani@xilinx.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/firmware/xilinx/zynqmp.c

@@ -512,6 +512,7 @@ static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
 static inline int zynqmp_is_valid_ioctl(u32 ioctl_id)
 {
 	switch (ioctl_id) {
+	case IOCTL_SD_DLL_RESET:
 	case IOCTL_SET_SD_TAPDELAY:
 	case IOCTL_SET_PLL_FRAC_MODE:
 	case IOCTL_GET_PLL_FRAC_MODE:

include/linux/firmware/xlnx-zynqmp.h

@@ -100,7 +100,8 @@ enum pm_ret_status {
 };
 
 enum pm_ioctl_id {
-	IOCTL_SET_SD_TAPDELAY = 7,
+	IOCTL_SD_DLL_RESET = 6,
+	IOCTL_SET_SD_TAPDELAY,
 	IOCTL_SET_PLL_FRAC_MODE,
 	IOCTL_GET_PLL_FRAC_MODE,
 	IOCTL_SET_PLL_FRAC_DATA,
@@ -271,6 +272,12 @@ enum tap_delay_type {
 	PM_TAPDELAY_OUTPUT,
 };
 
+enum dll_reset_type {
+	PM_DLL_RESET_ASSERT,
+	PM_DLL_RESET_RELEASE,
+	PM_DLL_RESET_PULSE,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID