by Rob Herring (Arm)

[permalink] [raw]

Subject: Re: [PATCH v3 3/5] i2c: designware: Add slave definitions

On Fri, Nov 18, 2016 at 02:35:52PM +0200, Andy Shevchenko wrote:
> On Fri, 2016-11-18 at 11:19 +0000, Luis Oliveira wrote:
> > ?- Add slave defintitions to i2c-designware-core
> > ?- Changes in Kconfig to auto-enable I2C_SLAVE when compiling the
> > modules
> > ?- Add compatible string to designware-core.txt explaining the
> > devicetree bindings
> >
>
>
> > --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> > @@ -2,7 +2,9 @@
> > ?
> > ?Required properties :
> > ?
> > - - compatible : should be "snps,designware-i2c"
> > + - compatible : should be:
> > +???- "snps,designware-i2c" to setup the hardware block as I2C master.
> > +???- "snps,designware-i2c-slave" to setup the hardware block as I2C
> > slave.
>
> Not sure about this one.
>
> Compatible string is more generic than list of modes. Basically you have
> to add a property which selects mode.

Yes, agreed. And come up with a common property.

> DT people's ACK is a must for this change.
>
>
> --- a/drivers/i2c/busses/Kconfig
> > +++ b/drivers/i2c/busses/Kconfig
> > @@ -470,6 +470,7 @@ config I2C_DESIGNWARE_CORE
> > ?config I2C_DESIGNWARE_PLATFORM
> > ? tristate "Synopsys DesignWare Platform"
> > ? select I2C_DESIGNWARE_CORE
> > + select I2C_SLAVE
> >
>
> Common rule, generic dependencies usually go first
>
> select I2C_SLAVE
> ? select I2C_DESIGNWARE_CORE
>
> --
> Andy Shevchenko <[email protected]>
> Intel Finland Oy

2016-11-18 22:28:40

by kernel test robot

[permalink] [raw]

Subject: Re: [PATCH v3 4/5] i2c: designware: Add slave mode as separated driver

Hi Luis,

[auto build test ERROR on v4.9-rc5]
[also build test ERROR on next-20161117]
[cannot apply to wsa/i2c/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Luis-Oliveira/i2c-designware-Add-slave-support/20161118-193236
config: x86_64-randconfig-s4-11190538 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All error/warnings (new ones prefixed by >>):

drivers/i2c/busses/i2c-designware-slave.c: In function 'i2c_dw_irq_handler_slave':
>> drivers/i2c/busses/i2c-designware-slave.c:295:3: error: implicit declaration of function 'i2c_slave_event' [-Werror=implicit-function-declaration]
i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, &val);
^~~~~~~~~~~~~~~
>> drivers/i2c/busses/i2c-designware-slave.c:295:31: error: 'I2C_SLAVE_WRITE_REQUESTED' undeclared (first use in this function)
i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, &val);
^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/i2c/busses/i2c-designware-slave.c:295:31: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/i2c/busses/i2c-designware-slave.c:302:6: error: 'I2C_SLAVE_WRITE_RECEIVED' undeclared (first use in this function)
I2C_SLAVE_WRITE_RECEIVED, &val)) {
^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/i2c/busses/i2c-designware-slave.c:314:7: error: 'I2C_SLAVE_READ_REQUESTED' undeclared (first use in this function)
I2C_SLAVE_READ_REQUESTED, &val))
^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/i2c/busses/i2c-designware-slave.c:320:36: error: 'I2C_SLAVE_READ_PROCESSED' undeclared (first use in this function)
if (!i2c_slave_event(dev->slave, I2C_SLAVE_READ_PROCESSED,
^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/i2c/busses/i2c-designware-slave.c:324:31: error: 'I2C_SLAVE_STOP' undeclared (first use in this function)
i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val);
^~~~~~~~~~~~~~
drivers/i2c/busses/i2c-designware-slave.c: At top level:
>> drivers/i2c/busses/i2c-designware-slave.c:370:2: error: unknown field 'reg_slave' specified in initializer
.reg_slave = i2c_dw_reg_slave,
^
>> drivers/i2c/busses/i2c-designware-slave.c:370:15: warning: excess elements in struct initializer
.reg_slave = i2c_dw_reg_slave,
^~~~~~~~~~~~~~~~
drivers/i2c/busses/i2c-designware-slave.c:370:15: note: (near initialization for 'i2c_dw_algo')
>> drivers/i2c/busses/i2c-designware-slave.c:371:2: error: unknown field 'unreg_slave' specified in initializer
.unreg_slave = i2c_dw_unreg_slave,
^
drivers/i2c/busses/i2c-designware-slave.c:371:17: warning: excess elements in struct initializer
.unreg_slave = i2c_dw_unreg_slave,
^~~~~~~~~~~~~~~~~~
drivers/i2c/busses/i2c-designware-slave.c:371:17: note: (near initialization for 'i2c_dw_algo')
cc1: some warnings being treated as errors

vim +/i2c_slave_event +295 drivers/i2c/busses/i2c-designware-slave.c

289 dw_readl(dev, DW_IC_CLR_START_DET);
290 if (stat & DW_IC_INTR_ACTIVITY)
291 dw_readl(dev, DW_IC_CLR_ACTIVITY);
292 if (stat & DW_IC_INTR_RX_OVER)
293 dw_readl(dev, DW_IC_CLR_RX_OVER);
294 if ((stat & DW_IC_INTR_RX_FULL) && (stat & DW_IC_INTR_STOP_DET))
> 295 i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, &val);
296
297 if (slave_activity) {
298 if (stat & DW_IC_INTR_RD_REQ) {
299 if (stat & DW_IC_INTR_RX_FULL) {
300 val = dw_readl(dev, DW_IC_DATA_CMD);
301 if (!i2c_slave_event(dev->slave,
> 302 I2C_SLAVE_WRITE_RECEIVED, &val)) {
303 dev_dbg(dev->dev, "Byte %X acked! ",
304 val);
305 }
306 dw_readl(dev, DW_IC_CLR_RD_REQ);
307 stat = i2c_dw_read_clear_intrbits_slave(dev);
308 } else {
309 dw_readl(dev, DW_IC_CLR_RD_REQ);
310 dw_readl(dev, DW_IC_CLR_RX_UNDER);
311 stat = i2c_dw_read_clear_intrbits_slave(dev);
312 }
313 if (!i2c_slave_event(dev->slave,
> 314 I2C_SLAVE_READ_REQUESTED, &val))
315 dw_writel(dev, val, DW_IC_DATA_CMD);
316 }
317 }
318
319 if (stat & DW_IC_INTR_RX_DONE) {
> 320 if (!i2c_slave_event(dev->slave, I2C_SLAVE_READ_PROCESSED,
321 &val))
322 dw_readl(dev, DW_IC_CLR_RX_DONE);
323
> 324 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val);
325 stat = i2c_dw_read_clear_intrbits_slave(dev);
326 return true;
327 }
328
329 if (stat & DW_IC_INTR_RX_FULL) {
330 val = dw_readl(dev, DW_IC_DATA_CMD);
331 if (!i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_RECEIVED,
332 &val))
333 dev_dbg(dev->dev, "Byte %X acked! ", val);
334 } else {
335 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val);
336 stat = i2c_dw_read_clear_intrbits_slave(dev);
337 }
338
339 if (stat & DW_IC_INTR_TX_OVER) {
340 dw_readl(dev, DW_IC_CLR_TX_OVER);
341 return true;
342 }
343 return true;
344 }
345
346 static irqreturn_t i2c_dw_isr_slave(int this_irq, void *dev_id)
347 {
348 struct dw_i2c_dev *dev = dev_id;
349 u32 stat, enabled, mode;
350
351 enabled = dw_readl(dev, DW_IC_ENABLE);
352 mode = dw_readl(dev, DW_IC_CON);
353 stat = dw_readl(dev, DW_IC_RAW_INTR_STAT);
354
355 dev_dbg(dev->dev, "%s: enabled=%#x stat=%#x\n", __func__, enabled,
356 stat);
357 if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
358 return IRQ_NONE;
359
360 stat = i2c_dw_read_clear_intrbits_slave(dev);
361 if (!i2c_dw_irq_handler_slave(dev))
362 return IRQ_NONE;
363
364 complete(&dev->cmd_complete);
365 return IRQ_HANDLED;
366 }
367
368 static struct i2c_algorithm i2c_dw_algo = {
369 .functionality = i2c_dw_func,
> 370 .reg_slave = i2c_dw_reg_slave,
> 371 .unreg_slave = i2c_dw_unreg_slave,
372 };
373
374 void i2c_dw_disable_slave(struct dw_i2c_dev *dev)

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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2016-11-23 14:43:38

by Luis de Oliveira

[permalink] [raw]

Subject: Re: [PATCH v3 3/5] i2c: designware: Add slave definitions

OK, I will create a "mode" string property in the devicetree that can be
"master" or "slave".

Thank you all,

Luis

On 18-Nov-16 17:01, Rob Herring wrote:
> On Fri, Nov 18, 2016 at 02:35:52PM +0200, Andy Shevchenko wrote:
>> On Fri, 2016-11-18 at 11:19 +0000, Luis Oliveira wrote:
>>> - Add slave defintitions to i2c-designware-core
>>> - Changes in Kconfig to auto-enable I2C_SLAVE when compiling the
>>> modules
>>> - Add compatible string to designware-core.txt explaining the
>>> devicetree bindings
>>>
>>
>>> --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
>>> +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
>>> @@ -2,7 +2,9 @@
>>>
>>> Required properties :
>>>
>>> - - compatible : should be "snps,designware-i2c"
>>> + - compatible : should be:
>>> + - "snps,designware-i2c" to setup the hardware block as I2C master.
>>> + - "snps,designware-i2c-slave" to setup the hardware block as I2C
>>> slave.
>> Not sure about this one.
>>
>> Compatible string is more generic than list of modes. Basically you have
>> to add a property which selects mode.
> Yes, agreed. And come up with a common property.
>
>> DT people's ACK is a must for this change.
>>
>>
>> --- a/drivers/i2c/busses/Kconfig
>>> +++ b/drivers/i2c/busses/Kconfig
>>> @@ -470,6 +470,7 @@ config I2C_DESIGNWARE_CORE
>>> config I2C_DESIGNWARE_PLATFORM
>>> tristate "Synopsys DesignWare Platform"
>>> select I2C_DESIGNWARE_CORE
>>> + select I2C_SLAVE
>>>
>> Common rule, generic dependencies usually go first
>>
>> select I2C_SLAVE
>> select I2C_DESIGNWARE_CORE
>>
>> --
>> Andy Shevchenko <[email protected]>
>> Intel Finland Oy

--
Best regards,
Luis