linux-kernel - Re: [PATCH 1/3] usb: chipidea: Add identification registers access APIs

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Date:	Wed, 24 Dec 2014 21:45:31 +0530
From:	Sanchayan Maity <maitysanchayan@...il.com>
To:	Stefan Agner <stefan@...er.ch>
CC:	Peter.Chen@...escale.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] usb: chipidea: Add identification registers access
 APIs

On 12/24/2014 09:30 PM, Stefan Agner wrote:
> On 2014-12-19 10:55, Sanchayan Maity wrote:
>> Using hw_write_id_reg and hw_read_id_reg to write and read
>> identification registers contents. This can be used to get
>> controller information, change some system configurations
>> and so on.
> 
> Checkpatch is complaining about DOS line endings and some trailing
> whitespace. This applies to all three patches.

Hmm... that's surprising. I did run checkpatch at my end before sending.
I do not have the original patchset on my laptop which I have right now
but downloading diffs back from lkml and running checkpatch on them back,
only gives me signed off errors as it should. 

I will resend if somehow errors crept in with my earlier patches.

-Sanchayan

> 
>>
>> Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
>> ---
>>  drivers/usb/chipidea/ci.h |   53 +++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 53 insertions(+)
>>
>> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
>> index ea40626..94db636 100644
>> --- a/drivers/usb/chipidea/ci.h
>> +++ b/drivers/usb/chipidea/ci.h
>> @@ -29,6 +29,15 @@
>>  /******************************************************************************
>>   * REGISTERS
>>   *****************************************************************************/
>> +/* Identification Registers */
>> +#define ID_ID				0x0
>> +#define ID_HWGENERAL			0x4
>> +#define ID_HWHOST			0x8
>> +#define ID_HWDEVICE			0xc
>> +#define ID_HWTXBUF			0x10
>> +#define ID_HWRXBUF			0x14
>> +#define ID_SBUSCFG			0x90
>> +
>>  /* register indices */
>>  enum ci_hw_regs {
>>  	CAP_CAPLENGTH,
>> @@ -97,6 +106,18 @@ enum ci_role {
>>  	CI_ROLE_END,
>>  };
>>  
>> +enum CI_REVISION {
> 
> Usually the enum names are small caps, only the labels are capitalized.
> I would suggest use ci_revision here (similar to the enum above).
> 
>> +	CI_REVISION_1X = 10,	/* Revision 1.x */
>> +	CI_REVISION_20 = 20, /* Revision 2.0 */
>> +	CI_REVISION_21, /* Revision 2.1 */
>> +	CI_REVISION_22, /* Revision 2.2 */
>> +	CI_REVISION_23, /* Revision 2.3 */
>> +	CI_REVISION_24, /* Revision 2.4 */
>> +	CI_REVISION_25, /* Revision 2.5 */
>> +	CI_REVISION_25_PLUS, /* Revision above than 2.5 */
>> +	CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
>> +};
>> +
>>  /**
>>   * struct ci_role_driver - host/gadget role driver
>>   * @start: start this role
>> @@ -168,6 +189,7 @@ struct hw_bank {
>>   * @b_sess_valid_event: indicates there is a vbus event, and handled
>>   * at ci_otg_work
>>   * @imx28_write_fix: Freescale imx28 needs swp instruction for writing
>> + * @rev: The revision number for controller
>>   */
>>  struct ci_hdrc {
>>  	struct device			*dev;
>> @@ -207,6 +229,7 @@ struct ci_hdrc {
>>  	bool				id_event;
>>  	bool				b_sess_valid_event;
>>  	bool				imx28_write_fix;
>> +	enum CI_REVISION		rev;
>>  };
>>  
>>  static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
>> @@ -244,6 +267,36 @@ static inline void ci_role_stop(struct ci_hdrc *ci)
>>  }
>>  
>>  /**
>> + * hw_read_id_reg: reads from a identification register
>> + * @ci: the controller
>> + * @offset: offset from the beginning of identification registers region
>> + * @mask: bitfield mask
>> + *
>> + * This function returns register contents
>> + */
>> +static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
>> +{
>> +	return ioread32(ci->hw_bank.abs + offset) & mask;
>> +}
>> +
>> +/**
>> + * hw_write_id_reg: writes to a identification register
>> + * @ci: the controller
>> + * @offset: offset from the beginning of identification registers region
>> + * @mask: bitfield mask
>> + * @data: new value
>> + */
>> +static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
>> +			    u32 mask, u32 data)
>> +{
>> +	if (~mask)
>> +		data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
>> +			| (data & mask);
>> +
>> +	iowrite32(data, ci->hw_bank.abs + offset);
>> +}
> 
> This function isn't used anywhere, does it make sense to write an ID
> register? The ones I see in Vybrid's RM are read-only anyway..
> 
> --
> Stefan
> 
>> +
>> +/**
>>   * hw_read: reads from a hw register
>>   * @ci: the controller
>>   * @reg:  register index
> 
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