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


On Monday 14 April 2014 05:35 PM, Vivek Gautam wrote:
> Hi Kishon,
>
>
> On Mon, Apr 14, 2014 at 5:24 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>> Hi,
>>
>> On Wednesday 09 April 2014 04:36 PM, Tomasz Figa wrote:
>>> Hi Vivek,
>>>
>>> Please see my comments inline.
>>>
>>> On 08.04.2014 16:36, 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
>>>
>>> [snip]
>>>
>>>> + Additional clock required for Exynos5420:
>>>> + - usb30_sclk_100m: Additional special clock used for PHY operation
>>>> + depicted as 'sclk_usbphy30' in CMU of Exynos5420.
>>>
>>> Are you sure this isn't simply a gate for the ref clock, as it can be found on
>>> another SoC that is not upstream yet? I don't have documentation for Exynos
>>> 5420 so I can't tell, but I'd like to ask you to recheck this.
>>>
>>>> +- 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";
>>>
>>> Binding description above doesn't mention "usb3phy_refclk" entry.
>>>
>>>> + samsung,syscon-phandle = <&pmu_syscon>;
>>>> + samsung,pmu-offset = <0x704>;
>>>> + #phy-cells = <1>;
>>>> + };
>>>
>>> [snip]
>>>
>>>> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
>>>> new file mode 100644
>>>> index 0000000..ff54a7c
>>>> --- /dev/null
>>>> +++ b/drivers/phy/phy-exynos5-usbdrd.c
>>>
>>> [snip]
>>>
>>>> +static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
>>>> +{
>>>> + struct device *dev = &pdev->dev;
>>>> + struct device_node *node = dev->of_node;
>>>> + struct exynos5_usbdrd_phy *phy_drd;
>>>> + struct phy_provider *phy_provider;
>>>> + struct resource *res;
>>>> + const struct of_device_id *match;
>>>> + const struct exynos5_usbdrd_phy_drvdata *drv_data;
>>>> + struct regmap *reg_pmu;
>>>> + u32 pmu_offset;
>>>> + int i;
>>>> +
>>>> + /*
>>>> + * Exynos systems are completely DT enabled,
>>>> + * so lets not have any platform data support for this driver.
>>>> + */
>>>> + if (!node) {
>>>> + dev_err(dev, "no device node found\n");
>>>
>>> This error message is not very meaningful. I'd rather use something like "This
>>> driver can be only instantiated using Device Tree".
>>
>> how about just adding depend_on OF in Kconfig?
>
> Already added a depend on 'OF'. Copying below the part of Kconfig in this patch.

Alright.. Do we need the check then? If config_OF is enabled devices will be
created using device tree no?

Thanks
Kishon


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