From: "Yu-Chun Lin [林祐君]" <eleanor.lin@realtek.com>
To: "Michael Walle" <mwalle@kernel.org>,
"linusw@kernel.org" <linusw@kernel.org>,
"andriy.shevchenko@intel.com" <andriy.shevchenko@intel.com>,
"brgl@kernel.org" <brgl@kernel.org>,
"TY_Chang[張子逸]" <tychang@realtek.com>,
"wbg@kernel.org" <wbg@kernel.org>,
"mathieu.dubois-briand@bootlin.com"
<mathieu.dubois-briand@bootlin.com>,
"nuno.sa@analog.com" <nuno.sa@analog.com>,
"Michael.Hennerich@analog.com" <Michael.Hennerich@analog.com>,
"jic23@kernel.org" <jic23@kernel.org>,
"andy@kernel.org" <andy@kernel.org>,
"u.kleine-koenig@baylibre.com" <u.kleine-koenig@baylibre.com>,
"dakr@kernel.org" <dakr@kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"o-takashi@sakamocchi.jp" <o-takashi@sakamocchi.jp>
Cc: "dlechner@baylibre.com" <dlechner@baylibre.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"linux@analog.com" <linux@analog.com>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"CY_Huang[黃鉦晏]" <cy.huang@realtek.com>,
"James Tai [戴志峰]" <james.tai@realtek.com>
Subject: RE: [PATCH v7 5/9] gpio: regmap: Add gpio_regmap_operation to extend reg_mask_xlate callback
Date: Fri, 24 Jul 2026 05:47:24 +0000 [thread overview]
Message-ID: <bb4d02c9d5de442b9324587e9b7aaeb1@realtek.com> (raw)
In-Reply-To: <DK5WSEM5SVXT.2A5HHVXDHGYGF@kernel.org>
> Hi,
>
> On Thu Jul 23, 2026 at 1:14 PM CEST, Yu-Chun Lin [林祐君] wrote:
>> Regarding the hardware, this controller indeed has dedicated and
>> separate bits for IN, OUT, and DIR. If configured as an output,
>> reading the IN bit does not reflect the actual state, so we must check
>> the DIR bit first to know which bit to read.
>
> Just out of curiosity, the out bit is also the control bit which
> will set the gpio line state, correct? IOW, you are reading just the
> bit you've set before and there is no way to read the real line state.
>
> -michael
In our current implementation, when configured as an output, we only read
back the state we set.
Best Regards,
Yu-Chun
next prev parent reply other threads:[~2026-07-24 5:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 3:42 [PATCH v7 0/9] gpio: realtek: Add support for Realtek DHC RTD1625 Yu-Chun Lin
2026-07-23 3:42 ` [PATCH v7 1/9] Revert "gpio: realtek: Add driver for Realtek DHC RTD1625 SoC" Yu-Chun Lin
2026-07-23 21:09 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 2/9] gpio: regmap: Provide default IRQ resource request and release callbacks Yu-Chun Lin
2026-07-23 21:10 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 3/9] gpio: regmap: Apply default resource callbacks for regmap IRQ chip Yu-Chun Lin
2026-07-23 16:36 ` Mathieu Dubois-Briand
2026-07-23 21:11 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 4/9] gpio: regmap: Order kernel-doc descriptions with the actual appearance Yu-Chun Lin
2026-07-23 21:11 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 5/9] gpio: regmap: Add gpio_regmap_operation to extend reg_mask_xlate callback Yu-Chun Lin
2026-07-23 6:51 ` Michael Walle
2026-07-23 11:14 ` Yu-Chun Lin [林祐君]
2026-07-23 11:20 ` Michael Walle
2026-07-24 5:47 ` Yu-Chun Lin [林祐君] [this message]
2026-07-24 10:22 ` William Breathitt Gray
2026-07-23 3:42 ` [PATCH v7 6/9] gpio: regmap: Add value_xlate callback Yu-Chun Lin
2026-07-23 6:54 ` Michael Walle
2026-07-23 21:14 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 7/9] gpio: regmap: Add set_config callback Yu-Chun Lin
2026-07-23 7:01 ` Michael Walle
2026-07-23 21:15 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 8/9] gpio: regmap: Add IRQ enable/disable helpers Yu-Chun Lin
2026-07-23 21:15 ` Linus Walleij
2026-07-23 3:42 ` [PATCH v7 9/9] gpio: realtek: Add driver for Realtek DHC RTD1625 SoC Yu-Chun Lin
2026-07-23 16:22 ` Mathieu Dubois-Briand
2026-07-24 5:49 ` Yu-Chun Lin [林祐君]
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