Hi Am 13.04.22 um 12:45 schrieb Javier Martinez Canillas:
Hello Thomas, Thanks for working on this. On 4/13/22 11:24, Thomas Zimmermann wrote:Create a platform device for each OF-declared framebuffer and have offb bind to these devices. Allows for real hot-unplugging and other drivers besides offb. Originally, offb created framebuffer devices while initializing its module by parsing the OF device tree. No actual Linux device was set up. This tied OF framebuffers to offb and makes writing other drivers for the OF framebuffers complicated. The absence of a Linux device prevented real hot-unplugging. Adding a distinct platform device for each OF framebuffer solves both problems. Specifically, a DRM drivers can now provide graphics output with modern userspace. Some of the offb init code is now located in the OF initialization. There's now also an implementation of of_platform_default_populate_init(), which was missing before. The OF side creates different devices for either OF display nodes or bootx displays as they require different handling by the driver. The offb drivers picks up each type of device and runs the appropriate fbdev initialization. Tested with OF display nodes on qemu's ppc64le target. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> ---[snip]+ for_each_node_by_type(node, "display") { + if (!of_get_property(node, "linux,opened", NULL) || + !of_get_property(node, "linux,boot-display", NULL)) + continue; + dev = of_platform_device_create(node, "of-display", NULL); + if (WARN_ON(!dev)) + return -ENOMEM; + boot_display = node; + break; + } + for_each_node_by_type(node, "display") { + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) + continue; + of_platform_device_create(node, "of-display", NULL);Shouldn't check for the return value here too ?
Failing is probably not useful, as it's not the main FB used for booting. Printing an error message wouldn't hurt, I guess. I'll also update the new driver registration in offb with an error message.
Other than this small nit, it looks good to me. Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Thanks. Best regards Thomas -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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