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Message-ID: <6a5610e0-e60d-4ab7-8708-6f77a38527b7@linaro.org>
Date:   Thu, 16 Nov 2023 12:21:33 +0100
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Subject: Re: [PATCH v2 10/12] pinctrl: samsung: add exynosautov920 pinctrl
Content-Language: en-US
To:     Jaewon Kim <jaewon02.kim@samsung.com>,
        Alim Akhtar <alim.akhtar@samsung.com>,
        Rob Herring <robh+dt@kernel.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Tomasz Figa <tomasz.figa@gmail.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Uwe Kleine-K?nig <u.kleine-koenig@pengutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jirislaby@kernel.org>
Cc:     linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
        linux-pwm@vger.kernel.org, linux-serial@vger.kernel.org
References: <20231115095609.39883-1-jaewon02.kim@samsung.com>
 <CGME20231115095856epcas2p1c3ee85750828bec2ee4ab0adeaeaff28@epcas2p1.samsung.com>
 <20231115095609.39883-11-jaewon02.kim@samsung.com>
 <62b7176d-f99c-49f6-a287-17a6b3604c1c@linaro.org>
 <f0f6a7af-2170-89a2-1eea-dfb9d8440321@samsung.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <f0f6a7af-2170-89a2-1eea-dfb9d8440321@samsung.com>
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Precedence: bulk

On 16/11/2023 06:39, Jaewon Kim wrote:
> On 23. 11. 15. 21:28, Krzysztof Kozlowski wrote:
> 
>> On 15/11/2023 10:56, Jaewon Kim wrote:
>>> ExynosAutov920 GPIO has a different register structure.
>>> In the existing Exynos series, EINT control register enumerated after
>>> a specific offset (e.g EXYNOS_GPIO_ECON_OFFSET).
>>> However, in ExynosAutov920 SoC, the register that controls EINT belongs
>>> to each GPIO group, and each GPIO group has 0x1000 align.
>>>
>>> This is a structure to protect the GPIO group with S2MPU in VM environment,
>>> and will only be applied in ExynosAuto series SoCs.
>>>
>>> Example)
>>> -------------------------------------------------
>>> | original		| ExynosAutov920	|
>>> |-----------------------------------------------|
>>> | 0x0	GPIO_CON	| 0x0	GPIO_CON	|
>>> | 0x4	GPIO_DAT	| 0x4	GPIO_DAT	|
>>> | 0x8	GPIO_PUD	| 0x8	GPIO_PUD	|
>>> | 0xc	GPIO_DRV	| 0xc	GPIO_DRV	|
>>> | 0x700	EINT_CON	| 0x18	EINT_CON	|
>>> | 0x800	EINT_FLTCON	| 0x1c	EINT_FLTCON0	|
>>> | 0x900	EINT_MASK	| 0x20	EINT_FLTCON1	|
>>> | 0xa00	EINT_PEND	| 0x24	EINT_MASK	|
>>> |			| 0x28	EINT_PEND	|
>>> -------------------------------------------------
>>>
>>> Pinctrl data for ExynosAutoV920 SoC.
>>>   - GPA0,GPA1 (10): External wake up interrupt
>>>   - GPQ0 (2): SPMI (PMIC I/F)
>>>   - GPB0,GPB1,GPB2,GPB3,GPB4,GPB5,GPB6 (47): I2S Audio
>>>   - GPH0,GPH1,GPH2,GPH3,GPH4,GPH5,GPH6,GPH8 (49): PCIE, UFS, Ethernet
>>>   - GPG0,GPG1,GPG2,GPG3,GPG4,GPG5 (29): General purpose
>>>   - GPP0,GPP1,GPP2,GPP3,GPP4,GPP5,GPP6,GPP7,GPP8,GPP9,GPP10 (77): USI
>>>
>>> Signed-off-by: Jaewon Kim<jaewon02.kim@samsung.com>
>>> ---
>>>   .../pinctrl/samsung/pinctrl-exynos-arm64.c    | 140 ++++++++++++++++++
>>>   drivers/pinctrl/samsung/pinctrl-exynos.c      | 102 ++++++++++++-
>>>   drivers/pinctrl/samsung/pinctrl-exynos.h      |  27 ++++
>>>   drivers/pinctrl/samsung/pinctrl-samsung.c     |   5 +
>>>   drivers/pinctrl/samsung/pinctrl-samsung.h     |  13 ++
>>>   5 files changed, 280 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/pinctrl/samsung/pinctrl-exynos-arm64.c b/drivers/pinctrl/samsung/pinctrl-exynos-arm64.c
>>> index cb965cf93705..cf86722a70a3 100644
>>> --- a/drivers/pinctrl/samsung/pinctrl-exynos-arm64.c
>>> +++ b/drivers/pinctrl/samsung/pinctrl-exynos-arm64.c
>>> @@ -796,3 +796,143 @@ const struct samsung_pinctrl_of_match_data fsd_of_data __initconst = {
>>>   	.ctrl		= fsd_pin_ctrl,
>>>   	.num_ctrl	= ARRAY_SIZE(fsd_pin_ctrl),
>>>   };
>>> +
>>> +/* pin banks of exynosautov920 pin-controller 0 (ALIVE) */
>>> +static struct samsung_pin_bank_data exynosautov920_pin_banks0[] = {
>> So you created patch from some downstream code? No, please work on
>> upstream. Take upstream code and customize it to your needs. That way
>> you won't introduce same mistakes fixes years ago.
>>
>> Missing const.
> 
> Thanks for the guide.
> 
> I didn`t work on downstream source, but when I copy/paste
> 
> the struct enumerations from downstream, it seemed like

That's what I am talking about. Don't do like this.

We fixed several things in Linux kernel, so copying unfixed code is
wasting of everyone's time. Don't work on downstream. Don't copy
anything from downstream. You *MUST CUSTOMIZE* upstream file, not
downstream.


> 
> 'const' was missing.
> 
>>
>> ...
>>
>>> @@ -31,6 +31,7 @@
>>>   #define EXYNOS7_WKUP_EMASK_OFFSET	0x900
>>>   #define EXYNOS7_WKUP_EPEND_OFFSET	0xA00
>>>   #define EXYNOS_SVC_OFFSET		0xB08
>>> +#define EXYNOSAUTOV920_SVC_OFFSET	0xF008
>>>   
>> ...
>>
>>>   #ifdef CONFIG_PINCTRL_S3C64XX
>>>   	{ .compatible = "samsung,s3c64xx-pinctrl",
>>> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.h b/drivers/pinctrl/samsung/pinctrl-samsung.h
>>> index 9b3db50adef3..cbb78178651b 100644
>>> --- a/drivers/pinctrl/samsung/pinctrl-samsung.h
>>> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.h
>>> @@ -122,6 +122,9 @@ struct samsung_pin_bank_type {
>>>    * @eint_type: type of the external interrupt supported by the bank.
>>>    * @eint_mask: bit mask of pins which support EINT function.
>>>    * @eint_offset: SoC-specific EINT register or interrupt offset of bank.
>>> + * @mask_offset: SoC-specific EINT mask register offset of bank.
>>> + * @pend_offset: SoC-specific EINT pend register offset of bank.
>>> + * @combine: EINT register is adjacent to the GPIO control register.
>> I don't understand it. Adjacent? Are you sure? GPIO control register has
>> 0xF004 (EXYNOSAUTOV920_SVC_OFFSET + 0x4)? Anyway, this does not scale.
>> What if next revision comes with not-adjacent. There will be
>> "combine_plus"? Also name confuses me - combine means together.
>>
>> Also your first map of registers does not have it adjacent...
> 
> I think I should have added a little more information about new struct.
> 
> -------------------------------------------------
> | original             | ExynosAutov920         |
> |-----------------------------------------------|
> | 0x0   GPA_CON	       | 0x0    GPA_CON         |
> | 0x4   GPA_DAT	       | 0x4    GPA_DAT         |
> | 0x8   GPA_PUD	       | 0x8    GPA_PUD         |
> | 0xc   GPA_DRV	       | 0xc    GPA_DRV         |
> |----------------------| 0x18   EINT_GPA_CON    |
> | 0x20  GPB_CON        | 0x1c   EINT_GPA_FLTCON0|
> | 0x4   GPB_DAT	       | 0x20   EINT_GPA_FLTCON1|
> | 0x28  GPB_PUD	       | 0x24   EINT_GPA_MASK   |
> | 0x2c  GPB_DRV	       | 0x28   EINT_GPA_PEND   |
> |----------------------|------------------------|
> | 0x700	EINT_GPA_CON   | 0x1000 GPA_CON         |
> | 0x704	EINT_GPB_CON   | 0x1004 GPA_DAT         |
> |----------------------| 0x1008 GPA_PUD         |
> | 0x800	EINT_GPA_FLTCON| 0x100c GPA_DRV         |
> | 0x804	EINT_GPB_FLTCON| 0x1018 EINT_GPA_CON    |
> |----------------------| 0x101c EINT_GPA_FLTCON0|
> | 0x900	EINT_GPA_MASK  | 0x1020 EINT_GPA_FLTCON1|
> | 0x904	EINT_GPB_MASK  | 0x1024 EINT_GPA_MASK   |
> |----------------------| 0x1028 EINT_GPA_PEND   |
> | 0xa00	EINT_GPA_PEND  |------------------------|
> | 0xa04	EINT_GPB_PEND  |                        |
> ------------------------------------------------|
> | 0xb08 SVC            | 0xf008 SVC             |
> -------------------------------------------------
> 
> The reason why I chose variable name 'combine' is that EINT registers was
> separated from gpio control address. However, in exynosautov920 EINT
> registers combined with GPx group. So I chose "combine" word.

What does it mean "the GPx group"? Combined means the same place, the
same register. I could imagine offset is 0x4, what I wrote last time.

Is the offset 0x4?


> Is another reasonable word, I will change it.


Why you cannot store the offset?

> 
> EINT registers related to the entire group(e.g SVC) were at the end of
> the GPIO block and are now moved to 0xf000.

So not in the same register, not combined?

Best regards,
Krzysztof