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([240f:74:7be:1:33e1:5e62:5b35:92b]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21de3300253sm65809075ad.162.2025.02.02.19.12.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Feb 2025 19:12:36 -0800 (PST) From: Koichiro Den To: linux-gpio@vger.kernel.org Cc: brgl@bgdev.pl, geert+renesas@glider.be, linus.walleij@linaro.org, maciej.borzecki@canonical.com, linux-kernel@vger.kernel.org Subject: [PATCH v2 03/10] gpio: aggregator: add read-only 'dev_name' configfs attribute Date: Mon, 3 Feb 2025 12:12:06 +0900 Message-ID: <20250203031213.399914-4-koichiro.den@canonical.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250203031213.399914-1-koichiro.den@canonical.com> References: <20250203031213.399914-1-koichiro.den@canonical.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a read-only 'dev_name' attribute to configfs interface, which exposes the platform bus device name. Users can easily identify which gpiochip has been created as follows: $ cat /sys/kernel/config/gpio-aggregator//dev_name gpio-aggregator.0 $ ls -d /sys/devices/platform/gpio-aggregator.0/gpiochip* gpiochip3 Signed-off-by: Koichiro Den --- drivers/gpio/gpio-aggregator.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c index c63cf3067ce7..76d3a8677308 100644 --- a/drivers/gpio/gpio-aggregator.c +++ b/drivers/gpio/gpio-aggregator.c @@ -732,6 +732,23 @@ static struct configfs_attribute *gpio_aggr_line_attrs= [] =3D { NULL }; =20 +static ssize_t +gpio_aggr_device_dev_name_show(struct config_item *item, char *page) +{ + struct gpio_aggregator *aggr =3D to_gpio_aggregator(item); + struct platform_device *pdev; + + guard(mutex)(&aggr->lock); + + pdev =3D aggr->pdev; + if (pdev) + return sprintf(page, "%s\n", dev_name(&pdev->dev)); + + return sprintf(page, "%s.%d\n", DRV_NAME, aggr->id); +} + +CONFIGFS_ATTR_RO(gpio_aggr_device_, dev_name); + static ssize_t gpio_aggr_device_live_show(struct config_item *item, char *page) { @@ -781,6 +798,7 @@ gpio_aggr_device_live_store(struct config_item *item, c= onst char *page, CONFIGFS_ATTR(gpio_aggr_device_, live); =20 static struct configfs_attribute *gpio_aggr_device_attrs[] =3D { + &gpio_aggr_device_attr_dev_name, &gpio_aggr_device_attr_live, NULL }; --=20 2.45.2