From: Linus Walleij <linus.walleij@linaro.org>
To: Biju Das <biju.das.jz@bp.renesas.com>
Cc: "Andy Shevchenko" <andy.shevchenko@gmail.com>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"Geert Uytterhoeven" <geert+renesas@glider.be>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Prabhakar Mahadev Lad" <prabhakar.mahadev-lad.rj@bp.renesas.com>,
"linux-renesas-soc@vger.kernel.org"
<linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH v6 01/13] pinctrl: core: Add pinctrl_get_device()
Date: Mon, 13 Mar 2023 23:05:06 +0100 [thread overview]
Message-ID: <CACRpkdZS5UKc7bDPs-zx_QyJU9GwJAhB7372oSC9tB-txgghtw@mail.gmail.com> (raw)
In-Reply-To: <OS0PR01MB5922CC51889D094129820C0C86B59@OS0PR01MB5922.jpnprd01.prod.outlook.com>
On Thu, Mar 9, 2023 at 3:19 PM Biju Das <biju.das.jz@bp.renesas.com> wrote:
> I have an IP which detects short circuit between the output terminals and
> disable the output from pwm pins ,when it detects short circuit to protect from
> system failure.
>
> pwm-pins are involved in this operation.
>
> From user space we need to configure the type of protection for this pins (eg: disable PWM output,
> when both pwm outputs are high at same time).
Why do you want to do this from user space?
It sounds like something the kernel should be doing.
The kernel has a PWM subsystem, and a pin control subsystem,
and we don't even have a userspace ABI for pin control.
Pin control is designed to avoid electrical disasters
and a driver can add further policy for sure.
If you want to add policy of different types to avoid electrical
disaster into the pin control driver, go ahead, just run it by
Geert so he's on board with the ideas.
> For that, we need to find a provider device (which provides gpt-pins).
>
> pinctrl_get_device() returns "current provider device" associated with fname/gname.
> If " current provider device" == "pwm device" do the configuration.
I don't understand this, sorry.
Yours,
Linus Walleij
next prev parent reply other threads:[~2023-03-13 22:05 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 9:00 [PATCH v6 00/13] Add pinctrl sysfs and RZ/G2L POEG support Biju Das
2023-03-06 9:00 ` [PATCH v6 01/13] pinctrl: core: Add pinctrl_get_device() Biju Das
2023-03-06 23:33 ` andy.shevchenko
2023-03-07 8:13 ` Biju Das
2023-03-09 12:54 ` Andy Shevchenko
2023-03-09 13:26 ` Biju Das
2023-03-09 13:44 ` Andy Shevchenko
2023-03-09 14:19 ` Biju Das
2023-03-13 20:42 ` Biju Das
2023-03-13 22:05 ` Linus Walleij [this message]
2023-03-14 8:27 ` Biju Das
2023-03-14 8:42 ` Linus Walleij
2023-03-28 7:08 ` Biju Das
2023-03-14 9:33 ` Geert Uytterhoeven
2023-03-14 11:33 ` Biju Das
2023-03-15 8:00 ` Geert Uytterhoeven
2023-03-09 13:05 ` Linus Walleij
2023-03-09 13:18 ` Biju Das
2023-03-06 9:00 ` [PATCH v6 02/13] pinctrl: Add poutdisops variable to struct pinctrl_desc Biju Das
2023-03-06 9:00 ` [PATCH v6 03/13] pinctrl: Add sysfs support Biju Das
2023-03-06 23:38 ` andy.shevchenko
2023-03-07 8:54 ` Biju Das
2023-03-07 13:41 ` Linus Walleij
2023-03-07 14:43 ` Biju Das
2023-03-07 15:15 ` Greg KH
2023-03-28 7:07 ` Biju Das
2023-03-07 14:46 ` Greg KH
2023-03-06 9:00 ` [PATCH v6 04/13] pinctrl: renesas: rzg2l: Add pin output disable support Biju Das
2023-03-06 9:00 ` [PATCH v6 06/13] drivers: pinctrl: renesas: Add RZ/G2L POEG driver support Biju Das
2023-03-06 23:35 ` andy.shevchenko
2023-03-07 8:53 ` Biju Das
2023-03-07 9:58 ` Andy Shevchenko
2023-03-07 10:10 ` Biju Das
2023-03-07 12:30 ` Andy Shevchenko
2023-03-07 12:39 ` Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 07/13] pwm: rzg2l-gpt: Add support for output disable request from gpt Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 08/13] pinctrl: renesas: rzg2l-poeg: Add support for GPT Output-Disable Request Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 09/13] pwm: rzg2l-gpt: Add support for output disable when both output low Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 10/13] pinctrl: renesas: rzg2l-poeg: output-disable request from GPT when both outputs are low Biju Das
2023-03-06 23:39 ` andy.shevchenko
2023-03-07 8:57 ` Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 11/13] pwm: rzg2l-gpt: Add support for output disable on dead time error Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 12/13] pinctrl: renesas: rzg2l-poeg: output-disable request from GPT " Biju Das
2023-03-06 9:00 ` [DO NOT APPLY PATCH v6 13/13] tools/poeg: Add test app for poeg Biju Das
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