From mboxrd@z Thu Jan 1 00:00:00 1970 From: shiraz.hashim@st.com (Shiraz HASHIM) Date: Mon, 15 Mar 2010 10:45:59 +0530 Subject: QUERY: How to handle SOC Configuration (Peripheral Multiplexing) in linux In-Reply-To: References: <4B9DB823.1040809@st.com> Message-ID: <4B9DC28F.3060209@st.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hello Santosh, On 3/15/2010 10:27 AM, Shilimkar, Santosh wrote: >> -----Original Message----- >> From: linux-arm-kernel-bounces at lists.infradead.org [mailto:linux-arm-kernel- >> bounces at lists.infradead.org] On Behalf Of Viresh KUMAR >> Sent: Monday, March 15, 2010 10:02 AM >> To: linux-arm-kernel at lists.infradead.org >> Cc: Armando VISCONTI; 'Shiraz HASHIM' >> Subject: QUERY: How to handle SOC Configuration (Peripheral Multiplexing) in linux >> >> Hello everybody, >> >> In our SOC's (SPEArxxx), we have many peripheral sharing PL_GPIO pins and so >> only few peripherals can be selected in a configuration. This is configurable >> using a set of registers. Now the problem is to make following work: >> >> 1. How to do this selection in kernel in a simple way? >> 2. Based on this selection hardware registers needs to be configured. >> >> I propose following solution to solve this issue, but i am not sure if it is >> acceptable by community. >> >> Please see if it is fine. Or if there is any other way people may already be >> following for similar issues. >> >> I have provided this selection from "make menuconfig", based on selection I >> configure hardware at initialization time. Basically these selections will >> decide which device is present in the system when it boots. >> >> There are modes in which SOC can be configured and in these modes >> peripherals can be selected. >> > Since the data is board dependent, why don't you make this information as platform > data for devices and pass that information from board files depending on board type. > > This gives you flexibility as well and you don't need unnecessary cluttering of > Kconfig entries. But the standard drivers which are already in mainline may not support these platform data. regards Shiraz