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ram: k3-ddrss: Enable vtt regulator if present 

Attempt to get and enable a vtt regulator if one is provided from the
dts. If we do not find one, continue as not all platforms have this.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
This commit is contained in:
Lokesh Vutla 2021-05-11 10:22:13 -05:00
parent 9f9b5c1c16
commit 2ce6dedf0b
1 changed files with 14 additions and 0 deletions
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14
drivers/ram/k3-ddrss/k3-ddrss.c
View File

@ -15,6 +15,7 @@
#include <asm/io.h>
#include <power-domain.h>
#include <wait_bit.h>
#include <power/regulator.h>
#include "lpddr4_obj_if.h"
#include "lpddr4_if.h"
@ -40,6 +41,7 @@ struct k3_ddrss_desc {
u32 ddr_freq1;
u32 ddr_freq2;
u32 ddr_fhs_cnt;
struct udevice *vtt_supply;
};
static lpddr4_obj *driverdt;
@ -215,6 +217,18 @@ static int k3_ddrss_power_on(struct k3_ddrss_desc *ddrss)
return ret;
}
ret = device_get_supply_regulator(ddrss->dev, "vtt-supply",
&ddrss->vtt_supply);
if (ret) {
dev_dbg(ddrss->dev, "vtt-supply not found.\n");
} else {
ret = regulator_set_value(ddrss->vtt_supply, 3300000);
if (ret)
return ret;
dev_dbg(ddrss->dev, "VTT regulator enabled, volt = %d\n",
regulator_get_value(ddrss->vtt_supply));
}
return 0;
}