hal: add sysctl peripheral, doc hidden for default

Signed-off-by: Zhouqi Jiang <[email protected]>

src/lib.rs

@@ -15,6 +15,8 @@ pub mod gpio;
 pub mod phy;
 pub mod smhc;
 pub mod spi;
+#[doc(hidden)]
+pub mod sysctl;
 #[macro_use]
 pub mod uart;
 

src/sysctl.rs

@@ -0,0 +1,20 @@
+//! System power, LDO and calibration controller.
+
+use volatile_register::{RO, RW};
+
+/// System power, LDO and calibration controller registers.
+#[repr(C)]
+pub struct RegisterBlock {
+    /// System LDO Control Register.
+    // TODO: offset = 0x150
+    pub ldo_control: RW<u32>,
+    /// Resistor Calibration Control register.
+    // TODO: offset = 0x160
+    pub zq_resistor_control: RW<u32>,
+    /// 240-Ohm Resistor Manual Control register.
+    // TODO: offset = 0x168
+    pub zq_resistor_240_control: RW<u32>,
+    /// Resistor Calibration Status register.
+    // TODO: offset = 0x16C
+    pub zq_resistor_state: RO<u32>,
+}