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SubjectRe: [PATCH V4 1/5] phy: Add new Exynos5 USB 3.0 PHY driver


On Monday 14 April 2014 06:12 PM, Vivek Gautam wrote:
> Hi,
>
>
> On Mon, Apr 14, 2014 at 5:57 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>> Hi,
>>
>> On Tuesday 08 April 2014 08:06 PM, Vivek Gautam wrote:
>>> Add a new driver for the USB 3.0 PHY on Exynos5 series of SoCs.
>>> The new driver uses the generic PHY framework and will interact
>>> with DWC3 controller present on Exynos5 series of SoCs.
>>> Thereby, removing old phy-samsung-usb3 driver and related code
>>> used untill now which was based on usb/phy framework.
>>>
>>> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
>>> ---
>>> .../devicetree/bindings/phy/samsung-phy.txt | 42 ++
>>> drivers/phy/Kconfig | 11 +
>>> drivers/phy/Makefile | 1 +
>>> drivers/phy/phy-exynos5-usbdrd.c | 668 ++++++++++++++++++++
>>> 4 files changed, 722 insertions(+)
>>> create mode 100644 drivers/phy/phy-exynos5-usbdrd.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> index 28f9edb..6d99ba9 100644
>>> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> @@ -74,3 +74,45 @@ phy-consumer@12340000 {
>>>
>>> Refer to DT bindings documentation of particular PHY consumer devices for more
>>> information about required PHYs and the way of specification.
>>> +
>>> +Samsung Exynos5 SoC series USB DRD PHY controller
>>> +--------------------------------------------------
>>> +
>>> +Required properties:
>>> +- compatible : Should be set to one of the following supported values:
>>> + - "samsung,exynos5250-usbdrd-phy" - for exynos5250 SoC,
>>> + - "samsung,exynos5420-usbdrd-phy" - for exynos5420 SoC.
>>> +- reg : Register offset and length of USB DRD PHY register set;
>>> +- clocks: Clock IDs array as required by the controller
>>> +- clock-names: names of clocks correseponding to IDs in the clock property;
>>> + Required clocks:
>>> + - phy: main PHY clock (same as USB DRD controller i.e. DWC3 IP clock),
>>> + used for register access.
>>> + - ref: PHY's reference clock (usually crystal clock), associated by
>>> + phy name, used to determine bit values for clock settings
>>> + register.
>>> + Additional clock required for Exynos5420:
>>> + - usb30_sclk_100m: Additional special clock used for PHY operation
>>> + depicted as 'sclk_usbphy30' in CMU of Exynos5420.
>>> +- samsung,syscon-phandle: phandle for syscon interface, which is used to
>>> + control pmu registers for power isolation.
>>> +- samsung,pmu-offset: phy power control register offset to pmu-system-controller
>>> + base.
>>> +- #phy-cells : from the generic PHY bindings, must be 1;
>>> +
>>> +For "samsung,exynos5250-usbdrd-phy" and "samsung,exynos5420-usbdrd-phy"
>>> +compatible PHYs, the second cell in the PHY specifier identifies the
>>> +PHY id, which is interpreted as follows:
>>> + 0 - UTMI+ type phy,
>>> + 1 - PIPE3 type phy,
>>> +
>>> +Example:
>>> + usb3_phy: usbphy@12100000 {
>>> + compatible = "samsung,exynos5250-usbdrd-phy";
>>> + reg = <0x12100000 0x100>;
>>> + clocks = <&clock 286>, <&clock 1>;
>>> + clock-names = "phy", "usb3phy_refclk";
>>> + samsung,syscon-phandle = <&pmu_syscon>;
>>> + samsung,pmu-offset = <0x704>;
>>> + #phy-cells = <1>;
>>> + };
>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>> index 8d3c49c..d955a05 100644
>>> --- a/drivers/phy/Kconfig
>>> +++ b/drivers/phy/Kconfig
>>> @@ -166,4 +166,15 @@ config PHY_XGENE
>>> help
>>> This option enables support for APM X-Gene SoC multi-purpose PHY.
>>>
>>> +config PHY_EXYNOS5_USBDRD
>>> + tristate "Exynos5 SoC series USB DRD PHY driver"
>>> + depends on ARCH_EXYNOS5 && OF
>>> + depends on HAS_IOMEM
>>> + select GENERIC_PHY
>>> + select MFD_SYSCON
>>
>> Lets try to avoid select in Kconfig. We've got enough problems with that.
>
> I hope you meant with "select MFD_SYSCON".
> We are referencing the syscon for accessing pmu reg, for which we need
> this config to be selected.
> Other Exynos phy drivers also need this config and for that they have
> selected this.
>
> Do you want me to do it any other way ?

depends on is one option.

Thanks
Kishon


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