ARM: at91: pm: add sama7g5 ddr phy controller

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>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210415105010.569620-19-claudiu.beznea@microchip.com

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 5dc942a2012d9d99db7eb9ff4af030e60747bb8e..4dec7216a80e136d5b4ae612f515e15244414478 100644 (file)
--- 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;