linux-kernel - Re: [PATCH 1/2 v2] i2c: exynos5: add support for HSI2C on Exynos5260 SoC

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Message-ID: <CAHfPSqACobcw-qEA+Pa2KTG3vJN6hPhS=ond3z4L6=BABbh8TQ@mail.gmail.com>
Date:	Tue, 26 Nov 2013 17:23:56 +0530
From:	Naveen Krishna Ch <naveenkrishna.ch@...il.com>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	linux-i2c@...r.kernel.org, sjg@...omium.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nel.org>,
	Doug Anderson <dianders@...omium.org>, cpgs@...sung.com,
	Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH 1/2 v2] i2c: exynos5: add support for HSI2C on Exynos5260 SoC

Hello Sachin,

On 26 November 2013 16:59, Sachin Kamat <sachin.kamat@...aro.org> wrote:
> On 26 November 2013 09:56, Naveen Krishna Chatradhi
> <ch.naveen@...sung.com> wrote:
>> This patch adds new compatible to support HSI2C module on Exynos5260
>> HSI2C module on Exynos5260 needs to be reset during during initialization.
>>
>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
> [snip]
>>
>>  Required properties:
>>    - compatible: value should be.
>> -      -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c.
>> +       -> "samsung,exynos5-hsi2c", for i2c compatible with HSI2C available on
>> +                               Exynos5250/5420 SoCs.
The first HSI2C module is available on Exynos5 SoCs from Samsung.
Hence, "samsung,exynos5-hsi2c"
HSI2C Module on  Exynos5250 and Exynos5420 was exactly similar

HSI2C Module on Exynos5260 differs in hardware.
Hence, "samsung,exynos5260-hsi2c".

And as the new variants come we use "samsung,exynosXXX-hsi2c"
or we can go by "samsung,exynos5-hsi2c-v2"

Changing an existing compatible needs modification in the DT nodes as well.

I will change the compatible string, if anyone else also thinks its wise.
>
> This string could be made more specific ("samsung,exynos5250-hsi2c")
> now that we have variants for this.
>
>> +       -> "samsung,exynos5260-hsi2c", for i2c compatible with HSI2C available
>> +                               on Exynos5260 SoCs.
>> +
>>    - reg: physical base address of the controller and length of memory mapped
>>      region.
>>    - interrupts: interrupt number to the cpu.
>> diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
>> index da39ff0..497ff91 100644
>> --- a/drivers/i2c/busses/i2c-exynos5.c
>> +++ b/drivers/i2c/busses/i2c-exynos5.c
>> @@ -184,14 +184,35 @@ struct exynos5_i2c {
>>          * 2. Fast speed upto 1Mbps
>>          */
>>         int                     speed_mode;
>> +
>> +       /* Version of HS-I2C Hardware */
>> +       unsigned int            version;
>> +};
>> +
>> +enum hsi2c_version {
>> +       EXYNOS_5,
>
> ditto.
>
>> +       EXYNOS_5260
>>  };
>>
>
> --
> With warm regards,
> Sachin
> --
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