linux-kernel - Re: [PATCH v5 6/7] i2c: designware: enable SLAVE in platform module

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Date:   Wed, 28 Dec 2016 16:49:50 +0000
From:   Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
To:     Luis Oliveira <Luis.Oliveira@...opsys.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Luis Oliveira <Luis.Oliveira@...opsys.com>,
        <wsa@...-dreams.de>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <jarkko.nikula@...ux.intel.com>, <mika.westerberg@...ux.intel.com>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Ramiro.Oliveira@...opsys.com>, <Joao.Pinto@...opsys.com>,
        <CARLOS.PALMINHA@...opsys.com>
Subject: Re: [PATCH v5 6/7] i2c: designware: enable SLAVE in platform module



On 28-12-2016 16:41, Luis Oliveira wrote:
> On 28-Dec-16 16:31, Andy Shevchenko wrote:
>> On Wed, 2016-12-28 at 15:53 +0000, Luis Oliveira wrote:
>>> On 28-Dec-16 15:44, Andy Shevchenko wrote:
>>>> On Wed, 2016-12-28 at 14:43 +0000, Luis Oliveira wrote:
>>>>> - Slave mode selected in platform module (devicetree support only)
>>>>> - Check for ACPI - not supported in SLAVE mode:
>>>>>   - Changed the ifndef style to the use of ACPI_HANDLE that
>>>>> returns
>>>>> NULL
>>>>>     if the device was not enumerated from ACPI namespace.
>>>>
>>>> I'm not sure what is wrong with ACPI?
>>>
>>> I dont have a way to test it. Just that.
>>
>> Okay, can you provide an excerpt to see how it will look like in DTS?
> 
> Yes, it looks like this now:
> 
> 	i2c@...000 {
> 			compatible = "snps,designware-i2c";
> 			#address-cells = <1>;
> 			#size-cells = <0>;
> 			reg = <0x2000 0x100>;
> 			clock-frequency = <400000>;
> 			clocks = <&i2cclk>;
> 			interrupts = <0>;
> 
> 			eeprom@64 {
> 				compatible = "linux,slave-24c02";
> 				reg = <0x40000064>;
> 			};
> 	};

Probably this can be included as example in the device tree binding document.

>>  
>>>>> -	dev->functionality = I2C_FUNC_10BIT_ADDR |
>>>>> DW_IC_DEFAULT_FUNCTIONALITY;
>>>>> -
>>>>> -	i2c_dw_configure_master(pdev);
>>>>> +	if (ACPI_HANDLE(&pdev->dev) == NULL) {
>>>>
>>>> I don't think you need this at all.
>>>
>>> This is to avoid the use of the "ifdef" style I used before.
>>
>> My point is to drop it completely.
>>
>>>>
>>>>> +		device_for_each_child_node(&pdev->dev, child) {
>>>>
>>>> This is resource agnostic.
>>>>
>>>>> +			fwnode_property_read_u32(child, "reg",
>>>>> &reg);
>>>>
>>>> This is as well.
>>>
>>> Are you suggesting I use of_ functions?
>>
>> Nope. See above.
>>
>>
>