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This allows our DT to specify drive-strength property.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Currently, the UniPhier pinctrl drivers expose only the pin-group
interface to device tree.
Provide .get_pins_count, .get_pin_name, .pinconf_set hooks to support
pin configuration via 'pins' DT property.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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dev_err() is more suitable for printing error messages.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <trini@konsulko.com>
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The pin data are implemented for old SoCs to specify the bit shift of
the IECTRL register. They are not wortwhile given the required memory
footprint. Delete all the pin data and enable all bits of the IECTRL
register.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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These support the flat device tree. We want to use the dev_read_..()
prefix for functions that support both flat tree and live tree. So rename
the existing functions to avoid confusion.
In the end we will have:
1. dev_read_addr...() - works on devices, supports flat/live tree
2. devfdt_get_addr...() - current functions, flat tree only
3. of_get_address() etc. - new functions, live tree only
All drivers will be written to use 1. That function will in turn call
either 2 or 3 depending on whether the flat or live tree is in use.
Note this involves changing some dead code - the imx_lpi2c.c file.
Signed-off-by: Simon Glass <sjg@chromium.org>
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This header includes things that are needed to make driver build. Adjust
existing users to include that always, even if other dm/ includes are
present
Signed-off-by: Simon Glass <sjg@chromium.org>
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Support the following DT properties:
"bias-disable"
"bias-pull-up"
"bias-pull-down"
"bias-pull-pin-default"
"input-enable"
"input-disable"
My main motivation is to support pull up/down biasing. For Pro5 and
later SoCs, the pupdctrl register number is the same as the pinmux
number, so this feature can be supported without having big pin
tables.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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On LD4 SoC or later, the pin-mux registers are 8bit wide, while 4bit
wide on sLD3 SoC. Support it for the sLD3 pinctrl driver.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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These macros are only referenced in pinctrl-uniphier-core.c, so
they need not reside in a header file.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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This does not have much impact on behavior, but makes code look more
more like Linux. The use of devm_ioremap() often helps to delete
.remove callbacks entirely.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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SPL does not use all of the devices, so we can save some memory
footprint.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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PH1-LD4 and PH1-sLD8 SoCs have pins that support pin configuration
(pin biasing, drive strength control), but not pin-muxing.
Allow to fill the mux value table with -1 for those pins; pins with
mux value -1 will be skipped in the pin-mux set function. The mux
value type should be changed from "unsigned" to "int" in order to
accommodate -1 as a special case.
[ Linux commit: 363c90e743b50a432a91a211dd8b078d9df446e9 ]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Currently, the UniPhier pinctrl driver itself is a syscon, but it
turned out much more reasonable to make it a child node of a syscon
because our syscon node consists of a bunch of system configuration
registers, not only pinctrl, but also phy, and misc registers.
It is difficult to split the node. This commit allows to migrate to
the new DT structure.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Upcoming new pinctrl drivers for PH1-LD11 and PH-LD20 support input
signal gating for each pin. (While, existing ones only support it
per pin-group.) This commit prepares the core part for that.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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The core part of the UniPhier pinctrl driver needs to support a new
capability for upcoming UniPhier ARMv8 SoCs. This sometimes happens
because pinctrl drivers include really SoC-specific stuff.
This commit intends to tidy up SoC-specific parameters of the existing
drivers before adding new ones. Having flags would be better than
adding new members every time a new SoC-specific capability comes up.
At this time, there is one flag, UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE.
This capability (I'd say rather quirk) was added for PH1-Pro4 and
PH1-Pro5 as requirement from our customer. For those SoCs, one pin-mux
setting is controlled by the combination of two separate registers; the
LSB bits at register offset (8 * N) and the MSB bits at (8 * N + 4).
Because it is impossible to update two separate registers atomically,
the LOAD_PINCTRL register should be set in order to make the pin-mux
settings really effective.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Currently, fdtdec_get_addr_size() does not support the address
translation, so it cannot handle device trees with non-straight
"ranges" properties. (This would be a problem with DTS for UniPhier
ARMv8 SoCs.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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While IECTRL is disabled, input signals are pulled-down internally.
If pin-muxing is set up first, glitch signals (Low to High transition)
might be input to hardware blocks.
Bad case scenario:
[1] The hardware block is already running before pinctrl is handled.
(the reset is de-asserted by default or by a firmware, for example)
[2] The pin-muxing is set up. The input signals to hardware block
are pulled-down by the chip-internal biasing.
[3] The pins are input-enabled. The signals from the board reach the
hardware block.
Actually, one invalid character is input to the UART blocks for such
SoCs as PH1-LD4, PH1-sLD8, where UART devices start to run at the
power on reset.
To avoid such problems, pins should be input-enabled before muxing.
[ ported from Linux commit bac7f4c1bf5e7c6ccd5bb71edc015b26c77f7460 ]
Fixes: 5dc626f83619 ("pinctrl: uniphier: add UniPhier pinctrl core support")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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The core support for the pinctrl drivers for all the UniPhier SoCs.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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