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

config PHY_EXYNOS5_USBDRD
tristate "Exynos5 SoC series USB DRD PHY driver"
depends on ARCH_EXYNOS5 && OF
depends on HAS_IOMEM


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