regmap: port regmap_update_bits from linux ...

Port the regmap_update_bits function from linux v4.14-rc1 to barebox.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs-core: replace DEVFS_IS_PARTITION flag with pointer to the master cdev ...

Instead of having a flag indicating a cdev is a partition on
some master cdev, just add a master pointer to the cdev, so
that we can also find out who the master is.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

regmap: Add regmap_write_bits() function ...

Add code implementing a simple version of regmap_write_bits().

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: Introduce dev_request_mem_resource ...

dev_request_mem_region returns a void * which shall be checked with
IS_ERR(), but in some cases the valid pointer returned clashes with
error values. This is especially the case on some Atmel SoCs.

This introduces dev_request_mem_resource which returns a struct resource
instead which in any case can be checked with IS_ERR(). It's the drivers
responsibility then to get the IOMEM pointer from the resource.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: Fix unregister device after device probe failure ...

When a device probe fails the device is removed from the active list.
If then the device is unregistered afterwards it is removed from the
active list again resulting in a crash. To fix this initialize the
devices active list entry when removing it from the active list.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add initial regmap support ...

This adds initial regmap support. Function prototypes are from
the Kernel, the implemention is mostly rewritten. Currently the
regmap support is limited to the bare minimum to get started.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/mips'

drivers: bus: Match against id_table first ...

Matching against driver's name before looking throught its id_table
can lead to a somewhat strange and unintuitive behaviour where a
device whose driver's name matches one of the lines in id_table (which
is not unheard of in Linux kernel) will be probed against said driver
with 'id_table' field set to NULL which in turn will result in
dev_get_drvdata erroring out with -ENODEV.

This patch changes the behaviour such that device_match() only tries
to match against driver's name only if id_table of that driver is not
present.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: make all dev_request_mem_region_* routines MIPS compatible ...

Use IOMEM() macro in all dev_request_mem_region_* routines to allow
the proper mapping on all platforms.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

exitcall: move device_shutdown to exitcall infrastructure ...

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: detect: detect parent devices aswell ...

Let device_detect_by_name detect parent devices aswell. We
separate the devname strings by colons and call device_detect()
for each component. This makes it possible for example to

detect nand0.root.ubi.root

With the above detect will be called for nand0, nand0.root, nand0.root.ubi
and nand0.root.ubi.root. The nand0.root detection step will detect the
UBI volume and attach it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/of-device-id'

Merge branch 'for-next/misc'

of: use 'const void *' for struct of_device_id.data ...

Since 2011 barebox' of_device_id struct uses unsigned long type for data field:

    struct of_device_id {
            char *compatible;
            unsigned long data;
    };

Almost always struct of_device_id.data field are used as pointer
and need 'unsigned long' casting.

E.g. see 'git grep -A 4 of_device_id drivers/' output:

    drivers/ata/sata-imx.c:static __maybe_unused struct of_device_id imx_sata_dt_ids[] = {
    drivers/ata/sata-imx.c- {
    drivers/ata/sata-imx.c-         .compatible = "fsl,imx6q-ahci",
    drivers/ata/sata-imx.c-         .data = (unsigned long)&data_imx6,
    drivers/ata/sata-imx.c- }, {

Here is of_device_id struct in linux kernel v4.0:

    struct of_device_id {
            char name[32];
            char type[32];
            char compatible[128];
            const void *data;
    };

Changing of_device_id.data type to 'const void *data' will increase
barebox' linux kernel compatibility and decrease number of 'unsigned
long' casts.

Part of the patch was done using the 'coccinelle' tool with the
following semantic patch:

    @rule1@
    identifier dev;
    identifier type;
    identifier func;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type)
    + dev_get_drvdata(dev, (const void **)&type)
    ...>
    }
    @rule2@
    identifier dev;
    identifier type;
    identifier func;
    identifier data;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type->data)
    + dev_get_drvdata(dev, (const void **)&type->data)
    ...>
    }

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/base: Mark (of|platform)_device_id data as constant ...

There should be no reason to ever change the data pointed to by id_table
or of_compatible. So make this offical by adding some 'const's.

In Linux the corresponding pointers are marked as const, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

base: Introduce deferred probing ...

As expected, we would need deferred probing sooner or later. This is
a first approach to allow devices to return -EPROBE_DEFER and get
sorted into a list of deferred devices that will be re-probed later.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: Call bus->remove instead of driver->remove ...

In devices_shutdown we should call the busses remove function
which in turn calls the drivers remove function. Otherwise for
example PCI devices never get removed since they do not have
a remove function but a pcidev->remove function instead.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: Call remove function only when available ...

The bus implementations currently call the drivers remove
hook unconditionally, but this hook is seldomly populated. Only call
it when it's actually populated.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: fix device remove order ...

The active list is supposed to collect active devices in the
opposite order they are probed. This is used to remove the
devices in the correct order in devices_shutdown. The order
is wrong though when in a drivers probe function other devices
are registered. To get the order right we have to add the new
device to the active list before it is probed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers: remove unused function dev_protect() ...

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: dev_request_mem_region: fix return value for MIPS ...

The commit

    commit 0d7a213
    Author: Antony Pavlov <antonynpavlov at gmail.com>
    Date:   Wed Sep 10 11:42:19 2014 +0400

        MIPS: dts: use physical addresses (as Linux does)

        With IOMEM() adapted for MIPS we can use physical addresses
        in device tree reg property.

has switched MIPS dts files to physical addresses usage.

The patch was tested on qemu, but qemu malta board is tolerant
of using physical addresses for accesing to device
(Ingenic JZ4755 and JZ4780 processors are tolerant too!).
But other CPUs (e.g. Loongson LS1B) can throw an exception
in this situation.

Additional physical address to virtual address translation
on MIPS is needed.

We already have this in include/common.h

    #if defined(CONFIG_MIPS)
    #include <asm/addrspace.h>

    #define IOMEM(addr) ((void __force __iomem *)CKSEG1ADDR(addr))
    #else
    #define IOMEM(addr) ((void __force __iomem *)(addr))
    #endif

So use IOMEM() to fix dev_request_mem_region() return value.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: workaroud resource request that conflicts with errno PTR ...

broken since

commit ed6e965
Author:     Sascha Hauer <s.hauer@pengutronix.de>
resource: Let dev_request_mem_region return an error pointer

Introduce dev_request_mem_region_err_null

only used on platform like at91 where the resource address conflicts
with errno PTR.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/resource-err-ptr'

Introduce message logging support ...

This adds a buffer for log messages and a 'dmesg' command to
print the messages. The log buffer is implemented as log objects
rather than a string buffer. This makes it easy to implement
limiting the messages, cleaning the buffer and timestamping
the messages.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let dev_request_mem_region return an error pointer ...

For all users fix or add the error check.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let dev_request_mem_region_by_name return an error pointer ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let dev_get_mem_region return an error pointer ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

resource: Let dev_get_resource return an error pointer ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let request_iomem_region return an error pointer ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let dev_get_mem_region_by_name return an error pointer ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>