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Subject[PATCH v2] of: make MAX_RESERVED_REGIONS configurable
Date
MAX_RESERVED_REGIONS has changed several times. Max reserved regions
count grows bigger as more SOC subsystems require reserved regions.

Add a Kconfig for it so that when properly configured, the static
reserved_mem array consumes less memory on systems with few reserved
regions.

Signed-off-by: Calvin Zhang <calvinzhang.cool@gmail.com>
---
drivers/of/Kconfig | 10 ++++++++++
drivers/of/of_reserved_mem.c | 3 +--
2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 80b5fd44ab1c..47ffff9f6aba 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -73,6 +73,16 @@ config OF_IRQ
config OF_RESERVED_MEM
def_bool OF_EARLY_FLATTREE

+config OF_MAX_RESERVED_REGIONS
+ int "Maximum count of reserved regions"
+ depends on OF_RESERVED_MEM
+ default 64
+ help
+ Reserved regions in /reserved-memory node includes static
+ reservations with fixed location and dynamic ones for device
+ CMA regions. This parameter sets the maximum number of reserved
+ regions in the system.
+
config OF_RESOLVE
bool

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 9c0fb962c22b..d90ae4c03011 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -25,8 +25,7 @@

#include "of_private.h"

-#define MAX_RESERVED_REGIONS 64
-static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
+static struct reserved_mem reserved_mem[CONFIG_OF_MAX_RESERVED_REGIONS];
static int reserved_mem_count;

static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
--
2.30.2
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