Merge tag 'arm-soc-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC updates from Arnd Bergmann:
 "SoC specific code is generally used for older platforms that don't
  (yet) use device tree to do the same things.

   - Support is added for i.MXRT10xx, a Cortex-M7 based microcontroller
     from NXP. At the moment this is still incomplete as other portions
     are merged through different trees.

   - Long abandoned support for running NOMMU ARMv4 or ARMv5 platforms
     gets removed, now the Arm NOMMU platforms are limited to the
     Cortex-M family of microcontrollers

   - Two old PXA boards get removed, along with corresponding driver
     bits.

   - Continued cleanup of the Intel IXP4xx platforms, removing some
     remnants of the old board files.

   - Minor Cleanups and fixes for Orion, PXA, MMP, Mstar, Samsung

   - CPU idle support for AT91

   - A system controller driver for Polarfire"

* tag 'arm-soc-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (29 commits)
  ARM: remove support for NOMMU ARMv4/v5
  ARM: PXA: fix up decompressor code
  soc: microchip: make mpfs_sys_controller_put static
  ARM: pxa: remove Intel Imote2 and Stargate 2 boards
  ARM: mmp: Fix failure to remove sram device
  ARM: mstar: Select ARM_ERRATA_814220
  soc: add microchip polarfire soc system controller
  ARM: at91: Kconfig: select PM_OPP
  ARM: at91: PM: add cpu idle support for sama7g5
  ARM: at91: ddr: fix typo to align with datasheet naming
  ARM: at91: ddr: align macro definitions
  ARM: at91: ddr: remove CONFIG_SOC_SAMA7 dependency
  ARM: ixp4xx: Convert to SPARSE_IRQ and P2V
  ARM: ixp4xx: Drop all common code
  ARM: ixp4xx: Drop custom DMA coherency and bouncing
  ARM: ixp4xx: Remove feature bit accessors
  net: ixp4xx_hss: Check features using syscon
  net: ixp4xx_eth: Drop platform data support
  soc: ixp4xx-npe: Access syscon regs using regmap
  soc: ixp4xx: Add features from regmap helper
  ...

2 files changed, 24 insertions, 18 deletions

diff --git a/drivers/net/wan/Kconfig b/drivers/net/wan/Kconfig
index 592a8389fc5a..140780ac1745 100644
--- a/drivers/net/wan/Kconfig
+++ b/drivers/net/wan/Kconfig
@@ -293,7 +293,8 @@ config SLIC_DS26522
 config IXP4XX_HSS
 	tristate "Intel IXP4xx HSS (synchronous serial port) support"
 	depends on HDLC && IXP4XX_NPE && IXP4XX_QMGR
-	depends on ARCH_IXP4XX
+	depends on ARCH_IXP4XX && OF
+	select MFD_SYSCON
 	help
 	  Say Y here if you want to use built-in HSS ports
 	  on IXP4xx processor.
diff --git a/drivers/net/wan/ixp4xx_hss.c b/drivers/net/wan/ixp4xx_hss.c
index 0b7d9f2f2b8b..863c3e34e136 100644
--- a/drivers/net/wan/ixp4xx_hss.c
+++ b/drivers/net/wan/ixp4xx_hss.c
@@ -16,8 +16,10 @@
 #include <linux/hdlc.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/poll.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
@@ -1389,9 +1391,28 @@ static int ixp4xx_hss_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct net_device *ndev;
 	struct device_node *np;
+	struct regmap *rmap;
 	struct port *port;
 	hdlc_device *hdlc;
 	int err;
+	u32 val;
+
+	/*
+	 * Go into the syscon and check if we have the HSS and HDLC
+	 * features available, else this will not work.
+	 */
+	rmap = syscon_regmap_lookup_by_compatible("syscon");
+	if (IS_ERR(rmap))
+		return dev_err_probe(dev, PTR_ERR(rmap),
+				     "failed to look up syscon\n");
+
+	val = cpu_ixp4xx_features(rmap);
+
+	if ((val & (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) !=
+	    (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) {
+		dev_err(dev, "HDLC and HSS feature unavailable in platform\n");
+		return -ENODEV;
+	}
 
 	np = dev->of_node;
 
@@ -1516,25 +1537,9 @@ static struct platform_driver ixp4xx_hss_driver = {
 	.probe		= ixp4xx_hss_probe,
 	.remove		= ixp4xx_hss_remove,
 };
-
-static int __init hss_init_module(void)
-{
-	if ((ixp4xx_read_feature_bits() &
-	     (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) !=
-	    (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS))
-		return -ENODEV;
-
-	return platform_driver_register(&ixp4xx_hss_driver);
-}
-
-static void __exit hss_cleanup_module(void)
-{
-	platform_driver_unregister(&ixp4xx_hss_driver);
-}
+module_platform_driver(ixp4xx_hss_driver);
 
 MODULE_AUTHOR("Krzysztof Halasa");
 MODULE_DESCRIPTION("Intel IXP4xx HSS driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:ixp4xx_hss");
-module_init(hss_init_module);
-module_exit(hss_cleanup_module);