linux-kernel - Re: [PATCH 0/2] pinctrl:at91-pio4:add support for pullup/down

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Date:   Mon, 10 Oct 2022 11:11:35 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     <Ryan.Wanner@...rochip.com>, <ludovic.desroches@...rochip.com>,
        <linus.walleij@...aro.org>, <alexandre.belloni@...tlin.com>,
        <claudiu.beznea@...rochip.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] pinctrl:at91-pio4:add support for pullup/down

On 07/10/2022 at 17:16, Ryan.Wanner@...rochip.com wrote:
> From: Ryan Wanner <Ryan.Wanner@...rochip.com>
> 
> This patch set adds support for pull up/down pinctl configuration.
> The implementation is based off of other pinctl drivers that have
> implemented line bias configurations.
> 
> The second patch addes a case for PIN_CONFIG_PERSIST_STATE
> this shows up becuse the gpiod api passes this into the new config_set
> function that was just implemented. Looking at other drivers like TI
> driver, added the ENOTSUPP to the switch case for that state flag.
> 
> How this was tested was by using a gpio program that I created to test
> configuration from userspace. This program was run in the

Tested using the ioctl GPIO_V2_GET_LINE_IOCTL and with the configs flags:
GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN, GPIO_V2_LINE_FLAG_BIAS_PULL_UP and 
GPIO_V2_LINE_FLAG_BIAS_DISABLED.

> background using & then using gpioinfo function checked if the change
> has been detected by the gpiod api. Then using devmem reading the
> regester making sure that the correct bit was set. The registers where
> checked before and during the program is being run, making sure the
> change happens.
> 
> In the program Pin 127 would be passed into the test program. Before
> the program was ran devmem for pin 127 config register. After
> the progam is running in the background devmem for the same status
> register is called, the result is showing the change in pinconfig.
> The device used to test was the SAMA5D27_som1_ek.

Same here, on sama5d27 som1 ek board:
Tested-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Thanks, best regards,
   Nicolas

> 
> Ryan Wanner (2):
>    pinctrl: at91-pio4: Add configuration to userspace
>    pinctrl: at91-pio4: Add persist state case in config
> 
>   drivers/pinctrl/pinctrl-at91-pio4.c | 26 ++++++++++++++++++++++++++
>   1 file changed, 26 insertions(+)
> 


-- 
Nicolas Ferre