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SubjectRe: [RFC PATCH 1/6] phy: exynos-pcie: Add support for Exynos PCIe phy
Hi Jaehoon,

On Wed, Dec 28, 2016 at 8:19 AM, Jaehoon Chung <jh80.chung@samsung.com> wrote:
> Hi Vivek,
>
> On 12/27/2016 02:53 PM, Vivek Gautam wrote:
>> Hi Jaehoon,
>>
>>
>> On Mon, Dec 26, 2016 at 10:50 AM, Jaehoon Chung <jh80.chung@samsung.com> wrote:
>>> This patch supports to use Generic Phy framework for Exynos PCIe phy.
>>> When Exynos that supported the pcie want to use the PCIe,
>>> it needs to control the phy resgister.
>>> But it should be more complex to control in their own PCIe device drivers.
>>>
>>> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
>>> ---
>>> drivers/phy/Kconfig | 9 ++
>>> drivers/phy/Makefile | 1 +
>>> drivers/phy/phy-exynos-pcie.c | 227 ++++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 237 insertions(+)
>>> create mode 100644 drivers/phy/phy-exynos-pcie.c
>>>
>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>> index fe00f91..94b0433 100644
>>> --- a/drivers/phy/Kconfig
>>> +++ b/drivers/phy/Kconfig
>>> @@ -341,6 +341,15 @@ config PHY_EXYNOS5_USBDRD
>>> This driver provides PHY interface for USB 3.0 DRD controller
>>> present on Exynos5 SoC series.
>>>
>>> +config PHY_EXYNOS_PCIE
>>> + bool "Exynos PCIe PHY driver"
>>
>> Is there a reason for this not being 'tristate' ?
>
> Will change.

I notice that PCI_EXYNOS5433 is bool as well.
If the host has to be 'bool' then it makes sense to have phy
also bool as well. But if PCI_EXYNOS5433 can be made
tristate, then this also changes to tristate.

>
>>
>>> + depends on ARCH_EXYNOS && OF
>>> + depends on PCI_EXYNOS5433
>>> + select GENERIC_PHY
>>> + help
>>> + Enable PCIe PHY support for Exynos SoC series.
>>
>> If this driver is for Exynos5433, then same should come in this help
>> text as well.
>
> will support the other exynos series.
> I'm working on refactoring exynos5440 with PHY generic Framework.
> Then this drive is not for only Exnyos5433. how about?

Ok, it's good then. My only concern is 'depends on PCI_EXYNOS5433'
makes it look like it is for EXYNOS5433. I am fine if that changes as well.

[...]

>>> +
>>> +#define PCIE_EXYNOS5433_PMU_PHY_OFFSET 0x730
>>> +#define PCIE_PHY_OFFSET(x) ((x) * 0x4)
>>> +
>>> +/* Sysreg Fsys register offset and bit for Exynos5433 */
>>> +#define PCIE_PHY_MAC_RESET 0x208
>>> +#define PCIE_MAC_RESET_MASK 0xFF
>>> +#define PCIE_MAC_RESET BIT(4)
>>> +#define PCIE_L1SUB_CM_CON 0x1010
>>> +#define PCIE_REFCLK_GATING_EN BIT(0)
>>> +#define PCIE_PHY_COMMON_RESET 0x1020
>>> +#define PCIE_PHY_RESET BIT(0)
>>> +#define PCIE_PHY_GLOBAL_RESET 0x1040
>>> +#define PCIE_GLOBAL_RESET BIT(0)
>>> +#define PCIE_REFCLK BIT(1)
>>> +#define PCIE_REFCLK_MASK 0x16
>>> +#define PCIE_APP_REQ_EXIT_L1_MODE BIT(5)
>>> +
>>> +enum exynos_pcie_phy_data_type {
>>> + PCIE_PHY_TYPE_EXYNOS5433,
>>> +};
>>> +
>>> +struct exynos_pcie_phy_data {
>>> + enum exynos_pcie_phy_data_type ctrl_type;
>>
>> Why do we need this controller type ?
>> If there are changes in the IP between different version,
>> then you can as well use different compatibles.
>
> Do you mean is the using "of_device_is_compatible()"?

I meant that multiple compatible strings can be added based on the
IP versions. And any IP specific data can be put in the .data field
of 'of_device_id' structure.
If there's more to differentiate between the IP versions at runtime,
you can use of_device_is_compatible().

[...]



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