phy: qualcomm: eusb2-repeater: Rework init to drop redundant zero-out loop

Instead of incrementing the base of the global reg fields, which renders
the second instance of the repeater broken due to wrong offsets, use
regmap with base and offset. As for zeroing out the rest of the tuning
regs, avoid looping though the table and just use the table as is,
as it is already zero initialized.

Fixes: 99a517a582fc ("phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs")
Tested-by: Elliot Berman <quic_eberman@quicinc.com> # sm8650-qrd
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240201-phy-qcom-eusb2-repeater-fixes-v4-1-cf18c8cef6d7@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: qualcomm: phy-qcom-eusb2-repeater: Add tuning overrides

There are devices in the wild, like the Sony Xperia 1 V that *require*
different tuning than the base design for USB to work.

Add support for overriding the necessary tuning values.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230830-topic-eusb2_override-v2-4-7d8c893d93f6@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs

The vendor kernel zeroes out all tuning data outside the init sequence
as part of initialization. Follow suit to avoid UB.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230830-topic-eusb2_override-v2-3-7d8c893d93f6@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: qualcomm: phy-qcom-eusb2-repeater: Use regmap_fields

Switch to regmap_fields, so that the values written into registers are
sanitized by their explicit sizes and the different registers are
structured in an iterable object to make external changes to the init
sequence simpler.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230830-topic-eusb2_override-v2-2-7d8c893d93f6@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: Explicitly include correct DT includes

The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> # for drivers/phy/phy-can-transceiver.c
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20230714174841.4061919-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: qualcomm: phy-qcom-eusb2-repeater: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230307115900.2293120-14-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>

phy: qcom: Add QCOM SNPS eUSB2 repeater driver

PM8550B contains a eUSB2 repeater used for making the eUSB2 from
SM8550 USB 2.0 compliant. This can be modelled SW-wise as a Phy.
So add a new phy driver for it.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230208190200.2966723-5-abel.vesa@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>