From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755738Ab3JNPCr (ORCPT ); Mon, 14 Oct 2013 11:02:47 -0400 Received: from ns.mm-sol.com ([212.124.72.66]:48285 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750849Ab3JNPCp (ORCPT ); Mon, 14 Oct 2013 11:02:45 -0400 Message-ID: <525C0746.40506@mm-sol.com> Date: Mon, 14 Oct 2013 18:01:26 +0300 From: Stanimir Varbanov User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130221 Thunderbird/17.0.3 MIME-Version: 1.0 To: Stephen Boyd CC: Rob Herring , Pawel Moll , Mark Rutland , Stephen Warren , Ian Campbell , Matt Mackall , Herbert Xu , linux-kernel@vger.kernel.org, Rob Landley , devicetree@vger.kernel.org, linux-doc@vger.kernel.org, Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org Subject: Re: [PATCH v2 1/2] ARM: DT: msm: Add Qualcomm's PRNG driver binding document References: <1381504601-23773-1-git-send-email-svarbanov@mm-sol.com> <1381504601-23773-2-git-send-email-svarbanov@mm-sol.com> <20131011204640.GD13139@codeaurora.org> In-Reply-To: <20131011204640.GD13139@codeaurora.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Stephen, Thanks for the review. On 10/11/2013 11:46 PM, Stephen Boyd wrote: > On 10/11, Stanimir Varbanov wrote: >> This adds Qualcomm PRNG driver device tree binding documentation >> to use as an example in dts trees. >> >> Signed-off-by: Stanimir Varbanov >> --- >> Documentation/devicetree/bindings/rng/qcom,prng.txt | 17 +++++++++++++++++ >> 1 file changed, 17 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/rng/qcom,prng.txt >> >> diff --git a/Documentation/devicetree/bindings/rng/qcom,prng.txt b/Documentation/devicetree/bindings/rng/qcom,prng.txt >> new file mode 100644 >> index 000000000000..92be00085ab1 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/rng/qcom,prng.txt >> @@ -0,0 +1,17 @@ >> +Qualcomm MSM pseudo random number generator. >> + >> +Required properties: >> + >> +- compatible : should be "qcom,prng" >> +- reg : specifies base physical address and size of the registers map >> +- clocks : phandle to clock-controller plus clock-specifier pair >> +- clock-names : "prng" clocks all registers, FIFO and circuits in PRNG IP block > > We're trying to keep to more generic names such as "core" for > clocks like this. We've had problems in the past where hardware > designers named the clock input after the name of the hardware > and then the name of the hardware changed in the next version of > the chip (although the hardware was mostly compatible with the > previous version) and so they renamed the clock input. This > leaked into the software drivers and we had horrible things like > platform data for clock names. Sticking to "core" indicates what > the clock does (i.e. it clocks the core PRNG hardware) while > staying generic enough to prevent problems in the future if the > block is renamed to something else. It might also help us in the > future should our bus layer become smart enough to manage clocks > for drivers without their knowing. Thanks for the detailed explanation, I will rename the clock. > >> + >> +Example: >> + >> + rng { > > It's good practice to add the unit address here, so rng@f9bff000. I will follow the good practice, thanks. > >> + compatible = "qcom,prng"; >> + reg = <0xf9bff000 0x200>; >> + clocks = <&clock GCC_PRNG_AHB_CLK>; >> + clock-names = "prng"; >> + }; >