Merge tag 'memory-controller-drv-tegra-5.11-3' of git://git.kernel.or…

…g/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl into arm/drivers

Memory controller drivers for v5.11 - Tegra SoC, part two

Continuation of work on Tegra SoC memory controllers towards adding
interconnect support and integration with devfreq.

This brings few more patches including one which removes/fixes annoying
warning if the DTS patches get applied.  This is expected and only
informs that new features of Tegra memory controller drivers will not be
enabled however the warning itself could look worrying.

* tag 'memory-controller-drv-tegra-5.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl:
  memory: tegra30: Support interconnect framework
  memory: tegra20: Support hardware versioning and clean up OPP table initialization
  dt-bindings: memory: tegra20-emc: Document opp-supported-hw property

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt

@@ -16,6 +16,12 @@ Properties:
 - #interconnect-cells : Should be 0.
 - operating-points-v2: See ../bindings/opp/opp.txt for details.
 
+For each opp entry in 'operating-points-v2' table:
+- opp-supported-hw: One bitfield indicating SoC process ID mask
+
+	A bitwise AND is performed against this value and if any bit
+	matches, the OPP gets enabled.
+
 Optional properties:
 - core-supply: Phandle of voltage regulator of the SoC "core" power domain.
 

drivers/memory/tegra/Kconfig

@@ -24,6 +24,7 @@ config TEGRA30_EMC
 	tristate "NVIDIA Tegra30 External Memory Controller driver"
 	default y
 	depends on TEGRA_MC && ARCH_TEGRA_3x_SOC
+	select PM_OPP
 	help
 	  This driver is for the External Memory Controller (EMC) found on
 	  Tegra30 chips. The EMC controls the external DRAM on the board.

drivers/memory/tegra/tegra20-emc.c

@@ -910,43 +910,36 @@ static int tegra_emc_interconnect_init(struct tegra_emc *emc)
 
 static int tegra_emc_opp_table_init(struct tegra_emc *emc)
 {
-	struct opp_table *reg_opp_table = NULL, *clk_opp_table;
-	const char *rname = "core";
+	u32 hw_version = BIT(tegra_sku_info.soc_process_id);
+	struct opp_table *clk_opp_table, *hw_opp_table;
 	int err;
 
-	/*
-	 * Legacy device-trees don't have OPP table and EMC driver isn't
-	 * useful in this case.
-	 */
-	if (!device_property_present(emc->dev, "operating-points-v2")) {
-		dev_err(emc->dev,
-			"OPP table not found, please update your device tree\n");
-		return -ENODEV;
-	}
-
-	/* voltage scaling is optional */
-	if (device_property_present(emc->dev, "core-supply")) {
-		reg_opp_table = dev_pm_opp_set_regulators(emc->dev, &rname, 1);
-		if (IS_ERR(reg_opp_table))
-			return dev_err_probe(emc->dev, PTR_ERR(reg_opp_table),
-					     "failed to set OPP regulator\n");
-	}
-
 	clk_opp_table = dev_pm_opp_set_clkname(emc->dev, NULL);
 	err = PTR_ERR_OR_ZERO(clk_opp_table);
 	if (err) {
 		dev_err(emc->dev, "failed to set OPP clk: %d\n", err);
-		goto put_reg_table;
+		return err;
 	}
 
-	err = dev_pm_opp_of_add_table(emc->dev);
+	hw_opp_table = dev_pm_opp_set_supported_hw(emc->dev, &hw_version, 1);
+	err = PTR_ERR_OR_ZERO(hw_opp_table);
 	if (err) {
-		dev_err(emc->dev, "failed to add OPP table: %d\n", err);
+		dev_err(emc->dev, "failed to set OPP supported HW: %d\n", err);
 		goto put_clk_table;
 	}
 
-	dev_info(emc->dev, "current clock rate %lu MHz\n",
-		 clk_get_rate(emc->clk) / 1000000);
+	err = dev_pm_opp_of_add_table(emc->dev);
+	if (err) {
+		if (err == -ENODEV)
+			dev_err(emc->dev, "OPP table not found, please update your device tree\n");
+		else
+			dev_err(emc->dev, "failed to add OPP table: %d\n", err);
+
+		goto put_hw_table;
+	}
+
+	dev_info(emc->dev, "OPP HW ver. 0x%x, current clock rate %lu MHz\n",
+		 hw_version, clk_get_rate(emc->clk) / 1000000);
 
 	/* first dummy rate-set initializes voltage state */
 	err = dev_pm_opp_set_rate(emc->dev, clk_get_rate(emc->clk));
@@ -959,11 +952,10 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)
 
 remove_table:
 	dev_pm_opp_of_remove_table(emc->dev);
+put_hw_table:
+	dev_pm_opp_put_supported_hw(hw_opp_table);
 put_clk_table:
 	dev_pm_opp_put_clkname(clk_opp_table);
-put_reg_table:
-	if (reg_opp_table)
-		dev_pm_opp_put_regulators(reg_opp_table);
 
 	return err;
 }