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path: root/drivers/clk/at91/sama5d3.c
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Diffstat (limited to 'drivers/clk/at91/sama5d3.c')
-rw-r--r--drivers/clk/at91/sama5d3.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c
index 7e93c6edf305..ad6068b884de 100644
--- a/drivers/clk/at91/sama5d3.c
+++ b/drivers/clk/at91/sama5d3.c
@@ -40,9 +40,14 @@ static const struct clk_pcr_layout sama5d3_pcr_layout = {
static const struct {
char *n;
char *p;
+ unsigned long flags;
u8 id;
} sama5d3_systemck[] = {
- { .n = "ddrck", .p = "masterck_div", .id = 2 },
+ /*
+ * ddrck feeds DDR controller and is enabled by bootloader thus we need
+ * to keep it enabled in case there is no Linux consumer for it.
+ */
+ { .n = "ddrck", .p = "masterck_div", .id = 2, .flags = CLK_IS_CRITICAL },
{ .n = "lcdck", .p = "masterck_div", .id = 3 },
{ .n = "smdck", .p = "smdclk", .id = 4 },
{ .n = "uhpck", .p = "usbck", .id = 6 },
@@ -56,6 +61,7 @@ static const struct {
char *n;
u8 id;
struct clk_range r;
+ unsigned long flags;
} sama5d3_periphck[] = {
{ .n = "dbgu_clk", .id = 2, },
{ .n = "hsmc_clk", .id = 5, },
@@ -99,7 +105,11 @@ static const struct {
{ .n = "tdes_clk", .id = 44, },
{ .n = "trng_clk", .id = 45, },
{ .n = "fuse_clk", .id = 48, },
- { .n = "mpddr_clk", .id = 49, },
+ /*
+ * mpddr_clk feeds DDR controller and is enabled by bootloader thus we
+ * need to keep it enabled in case there is no Linux consumer for it.
+ */
+ { .n = "mpddr_clk", .id = 49, .flags = CLK_IS_CRITICAL },
};
static void __init sama5d3_pmc_setup(struct device_node *np)
@@ -222,7 +232,8 @@ static void __init sama5d3_pmc_setup(struct device_node *np)
for (i = 0; i < ARRAY_SIZE(sama5d3_systemck); i++) {
hw = at91_clk_register_system(regmap, sama5d3_systemck[i].n,
sama5d3_systemck[i].p,
- sama5d3_systemck[i].id);
+ sama5d3_systemck[i].id,
+ sama5d3_systemck[i].flags);
if (IS_ERR(hw))
goto err_free;
@@ -236,7 +247,8 @@ static void __init sama5d3_pmc_setup(struct device_node *np)
"masterck_div",
sama5d3_periphck[i].id,
&sama5d3_periphck[i].r,
- INT_MIN);
+ INT_MIN,
+ sama5d3_periphck[i].flags);
if (IS_ERR(hw))
goto err_free;