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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 04:20:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 04:20:09 +0300
commitbaaa68a9796ef2cadfe5caaf4c730412eda0f31c (patch)
tree73a8daadf72b5a80268222b863fc9f8f286b3c3d /drivers/net/wan
parent8ffa5709e577385a1c8d20fb434cb02732f1d991 (diff)
parent2f618d5ef5dd05e2380ee627814de90d5a33c3f2 (diff)
downloadlinux-baaa68a9796ef2cadfe5caaf4c730412eda0f31c.tar.xz
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 ...
Diffstat (limited to 'drivers/net/wan')
-rw-r--r--drivers/net/wan/Kconfig3
-rw-r--r--drivers/net/wan/ixp4xx_hss.c39
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);