[PATCH 18/24] ARM: at91: pm: add sama7g5 ddr phy controller

Claudiu Beznea
2021-03-31T11:01:14Z

SAMA7G5 self-refresh procedure accesses also the DDR PHY registers.
Adapt the code so that the at91_dt_ramc() to look also for DDR PHYs,
in case it is mandatory.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
arch/arm/mach-at91/pm.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 5dc942a2012d..4dec7216a80e 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -552,7 +552,12 @@ static const struct of_device_id ramc_ids[] __initconst = {
{ /*sentinel*/ }
};

-static __init void at91_dt_ramc(void)
+static const struct of_device_id ramc_phy_ids[] __initconst = {
+ { .compatible = "microchip,sama7g5-ddr3phy", },
+ { /* Sentinel. */ },
+};
+
+static __init void at91_dt_ramc(bool phy_mandatory)
{
struct device_node *np;
const struct of_device_id *of_id;
@@ -578,6 +583,16 @@ static __init void at91_dt_ramc(void)
if (!idx)
panic(pr_fmt("unable to find compatible ram controller node in dtb\n"));

+ /* Lookup for DDR PHY node, if any. */
+ for_each_matching_node_and_match(np, ramc_phy_ids, &of_id) {
+ soc_pm.data.ramc_phy = of_iomap(np, 0);
+ if (!soc_pm.data.ramc_phy)
+ panic(pr_fmt("unable to map ramc phy cpu registers\n"));
+ }
+
+ if (phy_mandatory && !soc_pm.data.ramc_phy)
+ panic(pr_fmt("DDR PHY is mandatory!\n"));
+
if (!standby) {
pr_warn("ramc no standby function available\n");
return;
@@ -936,7 +951,7 @@ void __init at91rm9200_pm_init(void)
soc_pm.data.standby_mode = AT91_PM_STANDBY;
soc_pm.data.suspend_mode = AT91_PM_ULP0;

- at91_dt_ramc();
+ at91_dt_ramc(false);

/*
* AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.
@@ -960,7 +975,7 @@ void __init sam9x60_pm_init(void)

at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
- at91_dt_ramc();
+ at91_dt_ramc(false);
at91_pm_init(NULL);

soc_pm.ws_ids = sam9x60_ws_ids;
@@ -980,7 +995,7 @@ void __init at91sam9_pm_init(void)
soc_pm.data.standby_mode = AT91_PM_STANDBY;
soc_pm.data.suspend_mode = AT91_PM_ULP0;

- at91_dt_ramc();
+ at91_dt_ramc(false);
at91_pm_init(at91sam9_idle);
}

@@ -994,7 +1009,7 @@ void __init sama5_pm_init(void)
return;

at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
- at91_dt_ramc();
+ at91_dt_ramc(false);
at91_pm_init(NULL);
}

@@ -1015,7 +1030,7 @@ void __init sama5d2_pm_init(void)

at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
- at91_dt_ramc();
+ at91_dt_ramc(false);
at91_pm_init(NULL);

soc_pm.ws_ids = sama5d2_ws_ids;
--
2.25.1