phy: samsung-ufs: switch back to syscon_regmap_lookup_by_phandle()

Now exynos-pmu can register its custom regmap for gs101 via
of_syscon_register_regmap() we can switch back to the standard
syscon_regmap_lookup_by_phandle() api for obtaining the regmap.

Additionally add a Kconfig dependency for MFD_SYSCON.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20241029192107.2344279-1-peter.griffin@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: petegriffin

drivers/phy/samsung/Kconfig

@@ -33,6 +33,7 @@ config PHY_SAMSUNG_UFS
 	tristate "Exynos SoC series UFS PHY driver"
 	depends on OF && (ARCH_EXYNOS || COMPILE_TEST)
 	select GENERIC_PHY
+	select MFD_SYSCON
 	help
 	  Enable this to support the Samsung Exynos SoC UFS PHY driver for
 	  Samsung Exynos SoCs. This driver provides the interface for UFS host

drivers/phy/samsung/phy-samsung-ufs.c

@@ -13,11 +13,11 @@
 #include <linux/of.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
-#include <linux/soc/samsung/exynos-pmu.h>
 
 #include "phy-samsung-ufs.h"
 
@@ -268,8 +268,8 @@ static int samsung_ufs_phy_probe(struct platform_device *pdev)
 		goto out;
 	}
 
-	phy->reg_pmu = exynos_get_pmu_regmap_by_phandle(dev->of_node,
-							"samsung,pmu-syscon");
+	phy->reg_pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
+						       "samsung,pmu-syscon");
 	if (IS_ERR(phy->reg_pmu)) {
 		err = PTR_ERR(phy->reg_pmu);
 		dev_err(dev, "failed syscon remap for pmu\n");