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AJvYcCVgwcthEDX3bAQ1Z0aoyT7HSGPoh9NAoQegvmB3+9WVqThqEesc7QFnwE1w+1qg8OdRLBZZhcW3VfsnBw==@vger.kernel.org, AJvYcCWuz/a2eotP0viCvvEkVQ4tTQaRdv/hUTqZCkg2Wi+XQ73R5HSjpC8e7OtCHepoXoaK8czeBghtxs1pkswMH+ERb8E=@vger.kernel.org, AJvYcCX84enKEKM6jHenbkL3jjpOrBxY97zFWmHgON9ArZYV4IfiYINzvhA4b6JFbiXW1kNsuPWk3VxTjp9n@vger.kernel.org X-Gm-Message-State: AOJu0YzoyDgGYncP3V7qsZ5CsPRcuo4VZvYpASMF6WDqOk+X2YWjw+d+ TOndo88M3ijw3PmZdPGRfk3FPQ5VupEBpNS6Sycdq29GpWW/EKnn X-Google-Smtp-Source: AGHT+IHA1Fk9Onw/spwGNct4Wclqn5nvY5/56xW83ouDwAKxhUBJfZPIqbtHW/ALsNn0rMEL0OdlUw== X-Received: by 2002:a05:6000:23c1:b0:37d:3e42:be32 with SMTP id ffacd0b85a97d-37d93b61d8cmr1830547f8f.0.1729165195655; Thu, 17 Oct 2024 04:39:55 -0700 (PDT) Received: from prasmi.Home ([2a02:c7c:e309:f400:f6f5:4306:392d:908d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d7fbf82b1sm7060399f8f.72.2024.10.17.04.39.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Oct 2024 04:39:55 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Linus Walleij , Geert Uytterhoeven , Magnus Damm , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH 6/7] pinctrl: pinmux: Introduce API to check if a pin is requested Date: Thu, 17 Oct 2024 12:39:41 +0100 Message-ID: <20241017113942.139712-7-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241017113942.139712-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20241017113942.139712-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lad Prabhakar Introduce `pin_requested` API to check if a pin is currently requested. This API allows pinctrl drivers to verify whether a pin is requested or not by checking if the pin is owned by either `gpio_owner` or `mux_owner`. GPIO pins used as interrupts through the `interrupts` DT property do not follow the usual `gpio_request`/`pin_request` path, unlike GPIO pins used as interrupts via the `gpios` property. As a result, such pins were reported as `UNCLAIMED` in the `pinmux-pins` sysfs file, even though they were in use as interrupts. With the newly introduced API, pinctrl drivers can check if a pin is already requested by the pinctrl core and ensure that pin is requested during when using as irq. This helps to ensure that the `pinmux-pins` sysfs file reflects the correct status of the pin. Signed-off-by: Lad Prabhakar Reviewed-by: Linus Walleij --- drivers/pinctrl/pinmux.c | 14 ++++++++++++++ drivers/pinctrl/pinmux.h | 5 +++++ 2 files changed, 19 insertions(+) diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index 02033ea1c643..6c3d18b162ad 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -99,6 +99,20 @@ bool pinmux_can_be_used_for_gpio(struct pinctrl_dev *pctldev, unsigned int pin) return !(ops->strict && !!desc->gpio_owner); } +bool pin_requested(struct pinctrl_dev *pctldev, int pin) +{ + struct pin_desc *desc; + + desc = pin_desc_get(pctldev, pin); + if (!desc) + return false; + + if (!desc->gpio_owner && !desc->mux_owner) + return false; + + return true; +} + /** * pin_request() - request a single pin to be muxed in, typically for GPIO * @pctldev: the associated pin controller device diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h index 2965ec20b77f..6d854eebaad4 100644 --- a/drivers/pinctrl/pinmux.h +++ b/drivers/pinctrl/pinmux.h @@ -42,6 +42,7 @@ int pinmux_map_to_setting(const struct pinctrl_map *map, void pinmux_free_setting(const struct pinctrl_setting *setting); int pinmux_enable_setting(const struct pinctrl_setting *setting); void pinmux_disable_setting(const struct pinctrl_setting *setting); +bool pin_requested(struct pinctrl_dev *pctldev, int pin); #else @@ -100,6 +101,10 @@ static inline void pinmux_disable_setting(const struct pinctrl_setting *setting) { } +bool pin_requested(struct pinctrl_dev *pctldev, int pin) +{ + return false; +} #endif #if defined(CONFIG_PINMUX) && defined(CONFIG_DEBUG_FS)