On Wed, Mar 11, 2026 at 8:38 PM Jon Hunter <[email protected]> wrote: > On 12/11/2025 13:55, Bartosz Golaszewski wrote:
... > On Tegra234, the main gpio controller has a total of 164 GPIOs (see > the tegra234_main_ports in drivers/gpio/gpio-tegra186.c). The GPIOs > are assigned a index by the kernel from 0-163, but these GPIOs are > not contiguous with respect to the device-tree specifier. If I may ask... Why? Is it sparse because there are pads that can't be used as GPIOs? > For example, in device-tree, if I have a shared-gpio with the > following specifier ... > > gpios = <&gpio TEGRA234_MAIN_GPIO(AF, 1) GPIO_ACTIVE_LOW>; > > The macro TEGRA234_MAIN_GPIO(AF, 1) evaluates to (23 * 8) + 1 = 185. To me it sounds like a bad design of the driver for this SoC/platform. > This is greater than 164 and this is causing the above crash because > 'entry->offset' in gpio_device_setup_shared() is greater than > 'gdev->ngpio' and this causes us to access invalid memory. > > This is what I have been able to determine so far and wanted to get > your inputs. -- With Best Regards, Andy Shevchenko
