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SubjectRe: [PATCH v5 3/9] phy: Add new Exynos USB 2.0 PHY driver
Hi,

On Wednesday 08 January 2014 11:26 PM, Kamil Debski wrote:
> Hi,
>
>> From: Kishon Vijay Abraham I [mailto:kishon@ti.com]
>> Sent: Monday, January 06, 2014 11:12 AM
>>
>> Hi,
>>
>> On Friday 20 December 2013 06:54 PM, Kamil Debski wrote:
>>> Add a new driver for the Exynos USB 2.0 PHY. The new driver uses the
>>> generic PHY framework. The driver includes support for the Exynos
>> 4x10
>>> and 4x12 SoC families.
>>>
>>> Signed-off-by: Kamil Debski <k.debski@samsung.com>
>>> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
>>> ---
>>> .../devicetree/bindings/phy/samsung-phy.txt | 55 ++++
>>> drivers/phy/Kconfig | 29 ++
>>> drivers/phy/Makefile | 3 +
>>> drivers/phy/phy-exynos4210-usb2.c | 257
>> ++++++++++++++++
>>> drivers/phy/phy-exynos4212-usb2.c | 306
>> ++++++++++++++++++++
>>> drivers/phy/phy-samsung-usb2.c | 226
>> +++++++++++++++
>>> drivers/phy/phy-samsung-usb2.h | 67 +++++
>>> 7 files changed, 943 insertions(+)
>>> create mode 100644 drivers/phy/phy-exynos4210-usb2.c
>>> create mode 100644 drivers/phy/phy-exynos4212-usb2.c
>>> create mode 100644 drivers/phy/phy-samsung-usb2.c
>>> create mode 100644 drivers/phy/phy-samsung-usb2.h
>>>
>> .
>> .
>> <snip>
>> .
>> .
>>
>>> diff --git a/drivers/phy/phy-samsung-usb2.h
>>> b/drivers/phy/phy-samsung-usb2.h new file mode 100644 index
>>> 0000000..ab89f91
>>> --- /dev/null
>>> +++ b/drivers/phy/phy-samsung-usb2.h
>>> @@ -0,0 +1,67 @@
>>> +/*
>>> + * Samsung SoC USB 1.1/2.0 PHY driver
>>> + *
>>> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
>>> + * Author: Kamil Debski <k.debski@samsung.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or
>>> +modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + */
>>> +
>>> +#ifndef _PHY_EXYNOS_USB2_H
>>> +#define _PHY_EXYNOS_USB2_H
>>> +
>>> +#include <linux/clk.h>
>>> +#include <linux/phy/phy.h>
>>> +#include <linux/device.h>
>>> +#include <linux/regmap.h>
>>> +#include <linux/spinlock.h>
>>> +
>>> +#define KHZ 1000
>>> +#define MHZ (KHZ * KHZ)
>>> +
>>> +struct samsung_usb2_phy_driver;
>>> +struct samsung_usb2_phy_instance;
>>> +struct samsung_usb2_phy_config;
>>> +
>>> +struct samsung_usb2_phy_instance {
>>> + const struct samsung_usb2_common_phy *cfg;
>>> + struct clk *clk;
>>> + struct phy *phy;
>>> + struct samsung_usb2_phy_driver *drv;
>>> + unsigned long rate;
>>> + u32 clk_reg_val;
>>> + bool enabled;
>>> +};
>>> +
>>> +struct samsung_usb2_phy_driver {
>>> + const struct samsung_usb2_phy_config *cfg;
>>> + struct clk *clk;
>>> + struct device *dev;
>>> + void __iomem *reg_phy;
>>> + struct regmap *reg_pmu;
>>> + struct regmap *reg_sys;
>>> + spinlock_t lock;
>>> + struct samsung_usb2_phy_instance instances[0];
>>
>> I think having instances as array here would allocate more space while
>> allocating 'samsung_usb2_phy_driver' in 'samsung_usb2_phy_probe'.
>>
>
> I am not sure if I understand you correctly here. Maybe I will explain
> what I intended to write. An array with size 0 at the end of a structure
> takes no space in the structure. The benefit of using it is that after
> the structure one can allocate a number of the array elements and
> address them easily. Another option would be placing pointer in the
> samsung_usb2_phy_instance and allocate memory separately, but this would
> involve two allocations and a pointer would be always present in the
> structure.

Al-right.. makes sense.

Thanks
Kishon
>
> Best wishes,
>



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