diff --git a/drivers/gpu/nvgpu/include/nvgpu/fifo.h b/drivers/gpu/nvgpu/include/nvgpu/fifo.h
index 9b0c7265e..efa4548cb 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/fifo.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/fifo.h
@@ -96,6 +96,14 @@
  *
  *   + include/nvgpu/tsg.h
  *
+ * RAM
+ * -------
+ *
+ * TODO
+ *
+ *   + include/nvgpu/gops_ramin.h
+ *   + include/nvgpu/gops_ramfc.h
+ *
  * Data Structures
  * ===============
  *
diff --git a/drivers/gpu/nvgpu/include/nvgpu/gops_ramin.h b/drivers/gpu/nvgpu/include/nvgpu/gops_ramin.h
index e2168a517..c2aaacf6d 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/gops_ramin.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/gops_ramin.h
@@ -27,25 +27,148 @@
 struct gk20a;
 struct nvgpu_mem;
 
+/**
+ * @file
+ *
+ * RAMIN HAL interface.
+ */
+
+/**
+ * RAMIN HAL operations.
+ *
+ * @see gpu_ops
+ */
 struct gops_ramin {
+	/**
+	 * @brief Sets GR context in Channel Instance Block.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 * @param inst_block [in]	Memory descriptor of Instance Block.
+	 * @param gpu_va [in]		GPU VA of GR context.
+	 *
+	 * This HAL programs GR engine context state address in channel
+	 * Instance Block.
+	 *
+	 * \a gpu_va is the GPU VA of the block of memory that will be
+	 * used for storing GR engine context state.
+	 */
 	void (*set_gr_ptr)(struct gk20a *g,
 			struct nvgpu_mem *inst_block, u64 gpu_va);
+	/**
+	 * @brief Sets size of big pages.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 * @param mem [in]		Memory descriptor of Instance Block.
+	 * @param size [in]		Big page size in bytes (e.g #SZ_64K
+	 * 				or #SZ_128K).
+	 *
+	 * Programs the \a size of big pages in a given Instance Block.
+	 */
 	void (*set_big_page_size)(struct gk20a *g,
 			struct nvgpu_mem *mem, u32 size);
+
+	/**
+	 * @brief Init Instance Block's PDB.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 * @param inst_block [in]	Memory descriptor of Instance Block.
+	 * @param pdb_addr [in]		Page Directory Base (physical address).
+	 * @param pdb_mem [in]		Memory descriptor of PDB.
+	 *
+	 * Initializes Page Directory Base in Instance Block:
+	 * - Set aperture for PDB memory, as per pdb_mem descriptor
+	 *   (i.e. sysmem/vidmem coherent/non-coherent).
+	 * - Set big page size to default (64K).
+	 * - Set lo and hi 32-bits of \a pdb_addr.
+	 * - Set PT format.
+	 * - Set volatile attribute default.
+	 *
+	 * \a pdb_mem is the DMA memory describing the PTEs or PDEs.
+	 *
+	 * @see nvgpu_pd_gpu_addr
+	 */
 	void (*init_pdb)(struct gk20a *g, struct nvgpu_mem *inst_block,
 			u64 pdb_addr, struct nvgpu_mem *pdb_mem);
+
+	/**
+	 * @brief Init PDB for sub-contexts.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 * @param inst_block [in]	Memory descriptor of Instance Block.
+	 * @param pdb_mem [in]		Memory descriptor of PDB.
+	 * @param replayable [in]	Indicates if errors are replayable
+	 * 				for this Instance Block.
+	 *
+	 * This HAL configures PDB for all sub-contexts of Instance Block:
+	 * - Get max number of sub-contexts from HW.
+	 * - Get aperture mask from \a pdb_mem.
+	 * - Get physical address of \a pdb_mem.
+	 * - For each sub-context:
+	 *    - Build PDB entry with defaults for PT version, big page size,
+	 *      volatile attribute, and above aperture.
+	 *    - If \a replayable is true, set replayable attribute for TEX
+	 *      and GCC faults.
+	 *    - Set lo and hi 32-bits to point to \a pdb_mem.
+	 *    - Program related entry in Instance Block.
+	 *
+	 * @see NVGPU_SETUP_BIND_FLAGS_REPLAYABLE_FAULTS_ENABLE
+	 */
 	void (*init_subctx_pdb)(struct gk20a *g,
 			struct nvgpu_mem *inst_block,
 			struct nvgpu_mem *pdb_mem,
 			bool replayable);
+
+	/**
+	 * @brief Init WAR for PDB cache.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 *
+	 * This HAL allows implementing chip specific initialization
+	 * related to PDB cache.
+	 *
+	 * @return 0 in case of success, < 0 in case of failure.
+	 */
 	int (*init_pdb_cache_war)(struct gk20a *g);
+
+	/**
+	 * @brief Deinit WAR for PDB cache.
+	 *
+	 * @param g [in]		Pointer to GPU driver struct.
+	 *
+	 * This HAL allows implementing chip specific de-initialization
+	 * related to PDB cache.
+	 */
 	void (*deinit_pdb_cache_war)(struct gk20a *g);
+
+	/**
+	 * @brief Instance Block shift.
+	 *
+	 * Returns Instance Block shift in bits, as defined in hardware manuals.
+	 * This is the amount of bits that should be 0 in the physical address
+	 * of the Instance Block. Therefore it defines the expected alignement
+	 * for the Instance Block address.
+	 *
+	 * @return Instance block shift in bits.
+	 */
+	u32 (*base_shift)(void);
+
+	/**
+	 * @brief Instance Block size.
+	 *
+	 * Returns Instance Block size, as defined in hardware manuals.
+	 *
+	 * @returns Instance Block size in bytes.
+	 */
+	u32 (*alloc_size)(void);
+
+	/** @cond DOXYGEN_SHOULD_SKIP_THIS */
+
 	void (*set_adr_limit)(struct gk20a *g,
 			struct nvgpu_mem *inst_block, u64 va_limit);
-	u32 (*base_shift)(void);
-	u32 (*alloc_size)(void);
 	void (*set_eng_method_buffer)(struct gk20a *g,
 			struct nvgpu_mem *inst_block, u64 gpu_va);
+
+	/** @endcond DOXYGEN_SHOULD_SKIP_THIS */
 };
 
 #endif