From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: [RESEND PATCH 2/2] pinctrl: introduce complex pin description Date: Mon, 15 Jun 2015 10:01:29 -0600 Message-ID: <557EF6D9.6050503@wwwdotorg.org> References: <1433948699-19800-1-git-send-email-ludovic.desroches@atmel.com> <1433948699-19800-3-git-send-email-ludovic.desroches@atmel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1433948699-19800-3-git-send-email-ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ludovic Desroches Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org List-Id: devicetree@vger.kernel.org On 06/10/2015 09:04 AM, Ludovic Desroches wrote: > Using a string to describe a pin in the device tree can be not enough. > Some controllers may need extra information to fully describe a pin. It > concerns mainly controllers which have a per pin muxing approach which > don't fit well the notions of groups and functions. > Instead of using a pin name, a 32 bit value is used. The 16 least > significant bits are used for the pin number. Other 16 bits can be used to > store extra parameters. The driver for the pin controller is supposed to provide this information in a table. The whole point of having a driver, rather than a table/list of raw register values in the DT, is so the driver can provide this information at a semantic level. This information is fixed per SoC and so make sense to put into a driver, while the board-specific configuration varies wildly, and hence makes sense to put into DT. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html