[PATCH v2 3/9] ram: k3-ddrss: Add comment about ecc_reserved_space

[Neha Malcom Francis]

The reserved space needed for storing the parity remains the same no
matter the size of the region that is being protected. Add this as a
comment for better code understanding.

Signed-off-by: Neha Malcom Francis <n-francis at ti.com>
---
 drivers/ram/k3-ddrss/k3-ddrss.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/ram/k3-ddrss/k3-ddrss.c b/drivers/ram/k3-ddrss/k3-ddrss.c
index ee1d9b5998f..a94755c3542 100644
--- a/drivers/ram/k3-ddrss/k3-ddrss.c
+++ b/drivers/ram/k3-ddrss/k3-ddrss.c
@@ -737,6 +737,11 @@ static void k3_ddrss_lpddr4_ecc_calc_reserved_mem(struct k3_ddrss_desc *ddrss)
 {
 	fdtdec_setup_mem_size_base_lowest();
 
+	/*
+	 * For every 512-byte data block, 64 bytes of ECC is stored inline and
+	 * is a reserved region. It remains 1/9th of the total DDR size
+	 * irrespective of the size of the region under protection.
+	 */
 	ddrss->ecc_reserved_space = ddrss->ddr_ram_size;
 	do_div(ddrss->ecc_reserved_space, 9);
 
-- 
2.34.1