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Author SHA1 Message Date
Erwan Gouriou
0143b5e3de drivers/pinctrl: stm32f1: Provide a function which centralize remap 
Centralize AFIO remapping into one single function.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-20 09:09:29 -05:00
Kumar Gala
c22e34397e drivers: serial: stm32: set default parity in driver 
Have the driver default to UART_CFG_PARITY_NONE if no parity property
exists rather than using default in binding.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-10-15 04:01:22 -05:00
Erwan Gouriou
91e9fde778 drivers/serial: stm32f1: REMAP_FULL is not a possible remap value 
'remap' value can never be REMAP_FULL for usart.
Fix this value depending on the usart instance.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-14 07:11:46 -05:00
Erwan Gouriou
b74a2162cb soc/arm: stm32: swap argument order in ST_STM32 PINCTRL macros 
In order to be in line with other DT_INST macros in zephyr code base,
swap the arguments order in following macro definitions:
*ST_STM32_DT_PINCTRL
*ST_STM32_DT_INST_PINCTRL
Update the users accordingly.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-09 11:52:59 +02:00
Erwan Gouriou
2d3cda7663 soc/arm: stm32: use _INST_ namespace in devicetree pinctrl helpers 
Current set of helpers provided for STM32 pinctrl devicetree are
using device instance as input.
In order to prepare for next version that will take node identifier
as input, change existing set of macros using _INST_ namespace.

Additionally rename NODE_ID_FROM_PINCTRL to
ST_STM32_DT_INST_NODE_ID_FROM_PINCTRL.

Finally update existing macros users to this new name scheme.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-09 11:52:59 +02:00
Erwan Gouriou
c495d4b985 drivers/serial: stm32f1: Disable remap when not required 
Make sure remap is disabled when not requested.
This should have no impact on current cases but is important
when dynamic pin configuration will be used.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-06 04:58:38 -05:00
Erwan Gouriou
346d2ab92f drivers/uart: stm32f1: Add remap support for dt configured pinctrl 
On stm32f1 series, device pinctrl configuration could be modified
thanks to remapping capability.
Remapping allows to provide alternate pinctrl configuration to a
peripheral device and applies to all impacted pins.

So, specifically for stm32f1 series, apply remapping when required
before proceeding with pin configuration.
Additionally, because remapping is defined individually for each pin,
apply a function on pinctrl configuration to check remapping setting
coherency accorss pins.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-01 11:08:42 -05:00
Erwan Gouriou
252a623ca2 drivers/serial: stm32: Enable use of dt pinctrl as serial signals 
When available, use dt pinctrl to configure a variable number of
serial signals.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-01 11:08:42 -05:00
Erwan Gouriou
ccd6b72bc0 drivers/serial: stm32: Fix indentation in STM32_UART_INIT 
Looks better this way

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-10-01 11:08:42 -05:00
Tomasz Bursztyka
ef560e0a53 drivers: Manual const-ification of device driver instance 
These are all the case that coccinelle cannot find as they are inside
macro declarations.

Fixed via:

git grep -rlz -E "\(struct device \*" |
	xargs -0 sed -i 's/(struct device/(const struct device/g'

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-09-02 13:48:13 +02:00
Tomasz Bursztyka
4dcfb5531c isr: Normalize usage of device instance through ISR 
The goal of this patch is to replace the 'void *' parameter by 'struct
device *' if they use such variable or just 'const void *' on all
relevant ISRs

This will avoid not-so-nice const qualifier tweaks when device instances
will be constant.

Note that only the ISR passed to IRQ_CONNECT are of interest here.

In order to do so, the script fix_isr.py below is necessary:

from pathlib import Path
import subprocess
import pickle
import mmap
import sys
import re
import os

cocci_template = """
@r_fix_isr_0
@
type ret_type;
identifier P;
identifier D;
@@
-ret_type <!fn!>(void *P)
+ret_type <!fn!>(const struct device *P)
{
 ...
(
 const struct device *D = (const struct device *)P;
|
 const struct device *D = P;
)
 ...
}

@r_fix_isr_1
@
type ret_type;
identifier P;
identifier D;
@@
-ret_type <!fn!>(void *P)
+ret_type <!fn!>(const struct device *P)
{
 ...
 const struct device *D;
 ...
(
 D = (const struct device *)P;
|
 D = P;
)
 ...
}

@r_fix_isr_2
@
type ret_type;
identifier A;
@@
-ret_type <!fn!>(void *A)
+ret_type <!fn!>(const void *A)
{
 ...
}

@r_fix_isr_3
@
const struct device *D;
@@
-<!fn!>((void *)D);
+<!fn!>(D);

@r_fix_isr_4
@
type ret_type;
identifier D;
identifier P;
@@
-ret_type <!fn!>(const struct device *P)
+ret_type <!fn!>(const struct device *D)
{
 ...
(
-const struct device *D = (const struct device *)P;
|
-const struct device *D = P;
)
 ...
}

@r_fix_isr_5
@
type ret_type;
identifier D;
identifier P;
@@
-ret_type <!fn!>(const struct device *P)
+ret_type <!fn!>(const struct device *D)
{
 ...
-const struct device *D;
...
(
-D = (const struct device *)P;
|
-D = P;
)
 ...
}
"""

def find_isr(fn):
    db = []
    data = None
    start = 0

    try:
        with open(fn, 'r+') as f:
            data = str(mmap.mmap(f.fileno(), 0).read())
    except Exception as e:
        return db

    while True:
        isr = ""
        irq = data.find('IRQ_CONNECT', start)
        while irq > -1:
            p = 1
            arg = 1
            p_o = data.find('(', irq)
            if p_o < 0:
                irq = -1
                break;

            pos = p_o + 1

            while p > 0:
                if data[pos] == ')':
                    p -= 1
                elif data[pos] == '(':
                    p += 1
                elif data[pos] == ',' and p == 1:
                    arg += 1

                if arg == 3:
                    isr += data[pos]

                pos += 1

            isr = isr.strip(',\\n\\t ')
            if isr not in db and len(isr) > 0:
                db.append(isr)

            start = pos
            break

        if irq < 0:
            break

    return db

def patch_isr(fn, isr_list):
    if len(isr_list) <= 0:
        return

    for isr in isr_list:
        tmplt = cocci_template.replace('<!fn!>', isr)
        with open('/tmp/isr_fix.cocci', 'w') as f:
            f.write(tmplt)

        cmd = ['spatch', '--sp-file', '/tmp/isr_fix.cocci', '--in-place', fn]

        subprocess.run(cmd)

def process_files(path):
    if path.is_file() and path.suffix in ['.h', '.c']:
        p = str(path.parent) + '/' + path.name
        isr_list = find_isr(p)
        patch_isr(p, isr_list)
    elif path.is_dir():
        for p in path.iterdir():
            process_files(p)

if len(sys.argv) < 2:
    print("You need to provide a dir/file path")
    sys.exit(1)

process_files(Path(sys.argv[1]))

And is run: ./fix_isr.py <zephyr root directory>

Finally, some files needed manual fixes such.

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-09-02 13:48:13 +02:00
Tomasz Bursztyka
e18fcbba5a device: Const-ify all device driver instance pointers 
Now that device_api attribute is unmodified at runtime, as well as all
the other attributes, it is possible to switch all device driver
instance to be constant.

A coccinelle rule is used for this:

@r_const_dev_1
  disable optional_qualifier
@
@@
-struct device *
+const struct device *

@r_const_dev_2
 disable optional_qualifier
@
@@
-struct device * const
+const struct device *

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-09-02 13:48:13 +02:00
Tomasz Bursztyka
98d9b01322 device: Apply driver_api/data attributes rename everywhere 
Via coccinelle:

@r_device_driver_api_and_data_1@
struct device *D;
@@
(
D->
-	driver_api
+	api
|
D->
-	driver_data
+	data
)

@r_device_driver_api_and_data_2@
expression E;
@@
(
net_if_get_device(E)->
-	driver_api
+	api
|
net_if_get_device(E)->
-	driver_data
+	data
)

And grep/sed rules for macros:

git grep -rlz 'dev)->driver_data' |
	xargs -0 sed -i 's/dev)->driver_data/dev)->data/g'

git grep -rlz 'dev->driver_data' |
	xargs -0 sed -i 's/dev->driver_data/dev->data/g'

git grep -rlz 'device->driver_data' |
	xargs -0 sed -i 's/device->driver_data/device->data/g'

Fixes #27397

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-08-11 19:30:53 +02:00
Tomasz Bursztyka
af6140cc0d device: Apply config_info rename everywhere 
Via coccinelle:

@r_device_config@
struct device *D;
@@

D->
-	config_info
+	config

And 2 grep/sed rules for macros:

git grep -rlz 'dev)->config_info' |
	xargs -0 sed -i 's/dev)->config_info/dev)->config/g'

git grep -rlz 'dev->config_info' |
	xargs -0 sed -i 's/dev->config_info/dev->config/g'

Fixes #27397

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-08-11 19:30:53 +02:00
Tomasz Bursztyka
04d6d0b120 drivers: serial: Fix uart_irq_callback_user_data_t usage 
Now providing the device pointer that calls the callback.

Fixes #26923

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-07-30 09:43:12 +02:00
Kumar Gala
a1b77fd589 zephyr: replace zephyr integer types with C99 types 
git grep -l 'u\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/u\(8\|16\|32\|64\)_t/uint\1_t/g"
	git grep -l 's\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/s\(8\|16\|32\|64\)_t/int\1_t/g"

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-06-08 08:23:57 -05:00
Kumar Gala
c2135f8721 devicetree: DT_NODE_HAS_COMPAT_STATUS_OKAY -> DT_NODE_HAS_COMPAT_STATUS 
Swap this out and make the status a parameter.
Leave a couple of cases of DT_NODE_HAS_COMPAT().

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
 2020-05-08 19:37:18 -05:00
Martí Bolívar
17b8667197 dts: clean up some redundant DT checks 
These are redundantly checking a node's status twice.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-05-08 19:37:18 -05:00
Martí Bolívar
7e0eed9235 devicetree: allow access to all nodes 
Usually, we want to operate only on "available" device
nodes ("available" means "status is okay and a matching binding is
found"), but that's not true in all cases.

Sometimes we want to operate on special nodes without matching
bindings, such as those describing memory.

To handle the distinction, change various additional devicetree APIs
making it clear that they operate only on available device nodes,
adjusting gen_defines and devicetree.h implementation details
accordingly:

- emit macros for all existing nodes in gen_defines.py, regardless
  of status or matching binding
- rename DT_NUM_INST to DT_NUM_INST_STATUS_OKAY
- rename DT_NODE_HAS_COMPAT to DT_NODE_HAS_COMPAT_STATUS_OKAY
- rename DT_INST_FOREACH to DT_INST_FOREACH_STATUS_OKAY
- rename DT_ANY_INST_ON_BUS to DT_ANY_INST_ON_BUS_STATUS_OKAY
- rewrite DT_HAS_NODE_STATUS_OKAY in terms of a new DT_NODE_HAS_STATUS
- resurrect DT_HAS_NODE in the form of DT_NODE_EXISTS
- remove DT_COMPAT_ON_BUS as a public API
- use the new default_prop_types edtlib parameter

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
 2020-05-08 19:37:18 -05:00
Tomasz Bursztyka
97326c0445 device: Fix structure attributes access 
Since struct devconfig was merged earlier into struct device, let's fix
accessing config_info, name, ... attributes everywhere via:

grep -rlZ 'dev->config->' | xargs -0 sed -i 's/dev->config->/dev->/g'

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 2020-05-08 23:07:44 +02:00
Martí Bolívar
87e1743ae0 devicetree: replace DT_HAS_DRV_INST with DT_INST_FOREACH 
Make drivers multi-instance wherever possible using DT_INST_FOREACH.
This allows removing DT_HAS_DRV_INST in favor of making drivers just
do the right thing regardless of how many instances there are.

There are a few exceptions:

- SoC drivers which use CMake input files (like i2c_dw.c) or otherwise
  would require more time to convert than I have at the moment. For the
  sake of expediency, just inline the DT_HAS_DRV_INST expansion for
  now in these cases.

- SoC drivers which are explicitly single-instance (like the nRF SAADC
  driver). Again for the sake of expediency, drop a BUILD_ASSERT in
  those cases to make sure the assumption that all supported SoCs have
  at most one available instance is valid, failing fast otherwise.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
 2020-05-06 17:35:08 -05:00
Pauli Salmenrinne
30003ffb86 drivers: serial: stm32: Support for parity in DTS for STM32 uart. 
Add support for devicetree property 'parity' for stm32 serial devices.

Signed-off-by: Pauli Salmenrinne <susundberg@gmail.com>
 2020-05-06 11:00:12 -05:00
Kumar Gala
fdd85d5ad7 dts: Rename DT_HAS_NODE macro to DT_HAS_NODE_STATUS_OKAY 
Rename DT_HAS_NODE to DT_HAS_NODE_STATUS_OKAY so the semantics are
clear.  As going forward DT_HAS_NODE will report if a NODE exists
regardless of its status.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-05-06 05:25:41 -05:00
Erwan Gouriou
76313f06db drivers/serial: stm32: Remove calls to CONFIG_LPUART_1 
Before removing CONFIG_LPUART_1 symbols in boards, remove its
use in serial driver.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-04-20 15:27:56 -05:00
Kumar Gala
989484b4bf drivers: stm32: Convert STM32 drivers to new DT_INST macros 
Convert older DT_INST_ macro use in STM32 drivers to the new
include/devicetree.h DT_INST macro APIs.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-03-26 12:22:12 -05:00
Erwan Gouriou
6275513051 drivers: serial: uart_stm32: convert to DT_INST defines 
Convert driver to use DT_INST_ defines.
In the process, we've removed all UART/USART/LPUART code in
device instanciation code which had no impact.
Since all uart/usart/lpuart nodes declare compatibility with
st,stm32uart, DT_INST_X_ST_STM32_UART_FOO could be used.

Removed DT_UART fixup macros.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2020-03-17 11:03:10 -06:00
Yannis Damigos
a4b448ea59 uart_stm32: Fix flow misspelling 
Fix flow misspelling.

Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>
 2020-02-07 08:08:25 -06:00
Kumar Gala
6115346174 drivers: serial: stm32: Fix possible issue with mixed enum 
When building with LLVM we get the following error:

uart_stm32.c:272:9: error: implicit conversion from enumeration type
'enum uart_config_parity' to different enumeration type
'enum uart_config_flow_control' [-Werror,-Wenum-conversion]
        return UART_CFG_PARITY_NONE;
        ~~~~~~ ^~~~~~~~~~~~~~~~~~~~

We shouldn't be mixing parity and flow control enum's.  Use
UART_CFG_FLOW_CTRL_NONE instead or UART_CFG_PARITY_NONE.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 2020-02-07 11:50:38 +01:00
Peter Bigot
0b0d2e640b treewide: use full path to clock_control/stm32_clock_control.h header 
The build infrastructure should not be adding the drivers subdirectory
to the include path.  Fix the legacy uses that depended on that
addition.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
 2020-01-26 17:52:12 +01:00
Francois Ramu
d3ffa8d089 driver: serial: Error handling issues in uart_stm32_set_baudrate 
This patch tests the return code when calling clock_control_get_rate
and completes the issue #20503 seen on watchdog
[Coverity CID :205655]

Fixes #20503

Signed-off-by: Francois Ramu <francois.ramu@st.com>
 2019-11-18 09:18:13 -06:00
Tommy Vestermark
22be864af3 stm32: Fix uart_irq_tx_complete() to output correct status 
Currently both uart_stm32_irq_tx_complete() and
uart_stm32_irq_tx_ready() return the TXE flag. However
uart_irq_tx_complete() should really return the TC flag to output true
"Transmit Complete" status.

Signed-off-by: Tommy Vestermark <tovsurf@vestermark.dk>
 2019-10-09 06:30:14 -05:00
Richard Osterloh
1d2a030ee3 drivers: serial: Add STM32G4X serial support 
Add UART driver support for STM32G4X SoC series.

Signed-off-by: Richard Osterloh <richard.osterloh@gmail.com>
 2019-10-04 18:44:24 -07:00
Erwan Gouriou
fda2ea7253 drivers/serial: stm32: Add support for STM32H7 series 
Add needful to enable uart on STM32H7.
This mostly impact dts but as well soc for fixup.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2019-07-04 08:50:04 -04:00
Erwan Gouriou
8c6070d89b drivers: stm32: Fix leading space warnings 
In two stm32 drivers, fix leading spaces warning.


Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2019-07-04 08:50:04 -04:00
Anas Nashif
5eb90ec169 cleanup: include/: move misc/__assert.h to sys/__assert.h 
move misc/__assert.h to sys/__assert.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2019-06-27 22:55:49 -04:00
Anas Nashif
d1b2718687 cleanup: include/: move uart.h to drivers/uart.h 
move uart.h to drivers/uart.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2019-06-27 22:55:49 -04:00
Anas Nashif
17ddd1714c cleanup: include/: move clock_control.h to drivers/clock_control.h 
move clock_control.h to drivers/clock_control.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2019-06-27 22:55:49 -04:00
Anas Nashif
4c32258606 style: add braces around if/while statements 
Per guidelines, all statements should have braces around them. We do not
have a CI check for this, so a few went in unnoticed.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2019-06-06 15:20:21 +02:00
Erwan Gouriou
9c1ffddcaf drivers: serial: Enable LPUART for STM32WB 
A required code to enable LPUART_1 on stm32wb series.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2019-05-21 07:49:14 -05:00
Erwan Gouriou
69a2896f3e drivers/serial: stm32: Optimize LPUART code 
On STM32 series currently available in Zephyr,
LPUART and U(S)ART IPs are similar and share most of their
registers. As a consequence LL API defined for U(S)ART also
applies to LPUART.
This allows to remove specific LPUART code.

Restrict use of LL LPUART API when it diverges from UART one.


Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2019-05-21 07:49:14 -05:00
Benoit Leforestier
9fee67d562 Driver: Uart: Add support of 9 bits data length for STM32 
Some STM32 (F0, F1, F2, F3, F4, L0, L4) USART support
9bits data word length.

Signed-off-by: Benoit Leforestier <benoit.leforestier@gmail.com>
 2019-05-07 23:16:55 -04:00
Georgij Cernysiov
04da64db76 drivers: serial: stm32: dts binding, and fixup for flow control 
Allows to enable initial RTS/CTS hardware flow control
in the dts.

Co-authored-by: Benoit Leforestier <benoit.leforestier@gmail.com>
Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
 2019-04-17 16:09:54 -05:00
Georgij Cernysiov
78eed34b78 drivers: serial: stm32: add serial hw flow control 
Adds RTS CTS hardware flow control support.

Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
 2019-04-17 16:09:54 -05:00
Georgij Cernysiov
c74c131e4f drivers: serial: stm32: add err_check 
Adds 'err_check' implementation.

Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
 2019-04-17 15:58:56 -05:00
Georgij Cernysiov
3de55daab1 drivers: serial: stm32: remove forced RXNE clearance 
Removed RXNE clearance. RXNE is cleared upon reading DR|RDR register.

Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
 2019-04-17 15:51:43 -05:00
Benoit Leforestier
2a1c94cbc3 Driver: Serial STM32: Fix use of TXE IRQ 
In case of TX IRQ pending,
uart_stm32_irq_is_pending() function always return 0,
because "is TXE enabled ?" is checked instead of "is TC enabled ?".

Signed-off-by: Benoit Leforestier <benoit.leforestier@gmail.com>
 2019-01-23 04:30:58 -06:00
Pushpal Sidhu
acd0e25384 serial: stm32: Implement configure and config_get api calls 
Implement these two new api calls. Allows on-the-fly configuration
adjustment of uarts.

Signed-off-by: Pushpal Sidhu <psidhu.devel@gmail.com>
 2019-01-16 21:49:03 -05:00
Erwan Gouriou
4a25ae1694 drivers/serial: stm32: rename symbol UART_LPUART_1 to LPUART_1 
Following recent renaming of STM32 UART Kconfig UART symbols,
LPUART was named as UART_LPUART_1.
Rename to LPUART_1.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2019-01-09 08:05:24 -06:00
Erwan Gouriou
b1008ccb02 drivers/serial: stm32: Modify Kconfig instance flags 
STM32 uart Kconfig instance flags were not following
same naming scheme than other drivers (i2c, spi, ..)

Update driver to use UART_X instead of UART_STM32_PORT_X

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2018-12-14 09:59:37 -06:00
Erwan Gouriou
9062e97a45 drivers: stm32: check clock_control_on return value 
Check clock_control_on return value now that it is checking appropriate
bus is used in the request.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
 2018-12-07 11:31:48 -05:00