https://community.nxp.com/t5/LPC-Microcontrollers/LPC3250-how-to-configure-IRQ-for-GPIO-line/m-p/1802874#M55361 <P>Hi,</P><P>I work on a project that uses the LPC3250 board, which is connected to an external chip by a couple of GPIO pins. I need to set up IRQ for some of these lines to trigger an IRQ handler for incoming data.</P><P>Initially, this was developed using the 2.6 Linux kernel, and now it is being ported to a more recent 5.15 version. New kernels use the device tree to describe underlying hardware configuration and new GPIO descriptor-based API.</P><P>Inside the driver for the device, I try to use the gpiod_get_index() call to get the GPIO descriptor for each GPIO and then gpiod_to_irq() to get the IRQ number. The first call returns a valid descriptor, but the second one returns -EINVAL, like there's no valid IRQ entry. Looking into the Linux kernel GPIO code I can see that there's no GPIO consumer configured.</P><P>I'm interested in how to configure IRQ properly on this board. Maybe I need to make some modifications in the device tree file to describe the corresponding IRQ or something similar.</P> Tue, 06 Feb 2024 18:07:40 GMT Shponka 2024-02-06T18:07:40Z https://community.nxp.com/t5/LPC-Microcontrollers/LPC3250-how-to-configure-IRQ-for-GPIO-line/m-p/1802874#M55361 <P>Hi,</P><P>I work on a project that uses the LPC3250 board, which is connected to an external chip by a couple of GPIO pins. I need to set up IRQ for some of these lines to trigger an IRQ handler for incoming data.</P><P>Initially, this was developed using the 2.6 Linux kernel, and now it is being ported to a more recent 5.15 version. New kernels use the device tree to describe underlying hardware configuration and new GPIO descriptor-based API.</P><P>Inside the driver for the device, I try to use the gpiod_get_index() call to get the GPIO descriptor for each GPIO and then gpiod_to_irq() to get the IRQ number. The first call returns a valid descriptor, but the second one returns -EINVAL, like there's no valid IRQ entry. Looking into the Linux kernel GPIO code I can see that there's no GPIO consumer configured.</P><P>I'm interested in how to configure IRQ properly on this board. Maybe I need to make some modifications in the device tree file to describe the corresponding IRQ or something similar.</P> Tue, 06 Feb 2024 18:07:40 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC3250-how-to-configure-IRQ-for-GPIO-line/m-p/1802874#M55361 Shponka 2024-02-06T18:07:40Z