From mboxrd@z Thu Jan 1 00:00:00 1970 From: moinejf@free.fr (Jean-Francois Moine) Date: Sun, 1 Sep 2013 09:04:20 +0200 Subject: [PATCH 2/2] ARM: Dove: Add the audio device to the Cubox DT In-Reply-To: <20130831112430.GD6617@n2100.arm.linux.org.uk> References: <20130828113521.35c53365@armhf> <521DCD80.9010105@gmail.com> <20130831125128.0e3a23c7@armhf> <20130831112430.GD6617@n2100.arm.linux.org.uk> Message-ID: <20130901090420.526e3bc3@armhf> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Sat, 31 Aug 2013 12:24:31 +0100 Russell King - ARM Linux wrote: > > According to the Dove specification, the audio controller works with > > the samples rates 44.1, 48 and 96 kHz, so, I don't see the usage of the > > external clock, except when using the two audio controllers with > > different sample rates. > > I don't see what the Dove specification has to do with that statement: > what the Dove spec says is that if you use just the internal DCO, then > only 44.1kHz, 48kHz and 96kHz are supported (with some trimming of that.) > However, the use of an external clock allows further rates to be supported. > If you have an external clock, there is no requirement to use the DCO for > those sample rates - you can if you wish, or you can use the external clock. > > The mainline driver implements the use of the DCO for the standard 44.1, > 48 and 96kHz rates, otherwise it uses the external clock if present. This > is entirely conformant with the Dove spec. Russell, I looked again at the Armada-510-Functional-Spec, and I found: - section 12.1 ... I2S Supported Features An audio sample rate (Fs) of 44.1/48/96 kHz. ... S/PDIF Supported Features The IEC60958-1, IEC60958-3, and IEC61937 specifications. An audio sample rate (Fs) of 44.1/48/96 kHz. ... - Table 436: Clocks Control Register Offset: Unit0: 0x000B1230, Unit1: 0x000B5230 ... 1:0 MCLK source RW MCLK = 256 Fs, where Fs = 44.1 kHz, 48 kHz, 96 kHz. 0x0 Playback should not be active when selecting an external MCLK, or moving from one external MCLK to another MCLK source. 0 = DCO: MCLK is from DCO. 1 = Reserved 2 = Reserved 3 = External: MCLK is from an external source. As they don't work with my TV set, may you confirm that these webradios http://kerne.online.stalig.net/live-ori.ogg http://www.tv-radio.com/station/france_bleu_breiz_izel_mp3/france_bleu_breiz_izel_mp3-32k.m3u http://plumfm.online.stalig.net/live-ori.ogg work for you with the external clock? (sample rates resp. 33.075, 24 and 22.05 kHz) -- Ken ar c'henta? | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/