Hi Geert, On 06 April 2018 10:57 Geert Uytterhoeven wrote: > On Thu, Apr 5, 2018 at 11:42 AM, Phil Edworthy wrote: > > On 30 March 2018 22:26 Andy Shevchenko wrote: > >> On Wed, Mar 28, 2018 at 5:22 PM, Phil Edworthy wrote: > >> > The DesignWare GPIO IP can be configured for either 1 or 32 > >> > interrupts, > >> > >> 1 to 32, or just a choice between two? > > Just a choice of 1 or 32. > > Note that by 'configured' I am talking about the hardware being > > configured in RTL prior to manufacturing a device. Once made, you cannot > change it. > > This configuration affects the number of output interrupt signals from > > the GPIO Controller block that are connected to an interrupt controller. > > Differentiating between different versions of an IP block using DT properties > is usually a bad idea, for several reasons: > - What if you discover another difference later? > - You cannot add differentiating properties retroactively, because of > backwards > compatibility with old DTBS. > > Hence I think you should introduce a new compatible value instead. This is not a different version of the IP, just a different configuration option. Most IP blocks have a huge number of knobs that can be twiddled by the HW people, such as cache size, UART fifo depth. I think this is no different. Thanks Phil
