From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: [PATCHv3 10/10] CLK: TI: always enable DESHDCP clock Date: Fri, 22 May 2015 09:27:07 +0300 Message-ID: <555ECC3B.6000701@ti.com> References: <1430906938-26128-1-git-send-email-tomi.valkeinen@ti.com> <1430906938-26128-11-git-send-email-tomi.valkeinen@ti.com> <555C744C.6070901@ti.com> <555C74E8.5010105@ti.com> <555CE1BF.4050506@codeaurora.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="iKuOIQTM119iSG5ueeLXFOTI03v2WK9fH" Return-path: Received: from devils.ext.ti.com ([198.47.26.153]:57479 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756101AbbEVG1i (ORCPT ); Fri, 22 May 2015 02:27:38 -0400 In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Paul Walmsley , Stephen Boyd Cc: Tero Kristo , Tony Lindgren , linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Nishanth Menon , Mike Turquette , linux-clk@vger.kernel.org --iKuOIQTM119iSG5ueeLXFOTI03v2WK9fH Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 21/05/15 06:06, Paul Walmsley wrote: >> Enable falls under the "critical clocks" discussion that is ongoing. I= >> assume that this is some sort of critical clock that can't be turned o= ff? >=20 > It only needs to be enabled for this particular display IP subsystem to= =20 > function: >=20 > http://marc.info/?l=3Dlinux-omap&m=3D142071550111482&w=3D2 >=20 > I believe Tomi is taking this approach (enabling it unconditionally) to= =20 > avoid adding support for a secondary IP block "main clock" to the hwmod= =20 Right. I don't think that would be a simple task (correct me if I'm wrong), and that would all be only for this one IP on this particular SoC type. > code. Apparently, the chips that contain this clock gating bit are not= =20 > intended to be used for power-critical use cases, so there's not much=20 > motivation to switch it on and off with the display controller. Even in power-critical use cases the the power use difference should be negligible. Tomi --iKuOIQTM119iSG5ueeLXFOTI03v2WK9fH Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJVXsw7AAoJEPo9qoy8lh71bSQP/iYmQLBtqx0bUS61QZJhk1Ft O9fTWhE1Stu6SzitL/j8Y9E550DMSF1VLbNjCzTwr5cWJlg0MXLbdYVp9AnzfSyX UW4670ChWpSw+/cn9XP+XhYE1NmAqjat1xc9B/nm4TD/Ky1l5GntSkku3eQKuTZT qPSNzKzVqbAnN0rymWEdkXFOQGzCHhmqCo9bx7uM+qMpspqXB6s9XpFLmd4EQRpB bQPWPHjVV/maUWbKsR6CZjpdZPsL8f0Tnj69OCoVU/Lptp9+FPUj8P0cy15L3Zlw DuQHM2vBnfK6MJOK7H+D5DV/IgTEzid9Rnyr1yt33YUxb89YPbRo2cMZym/rwNE2 +6rs5yaEAs8mSdnj0kTY65O6V+aaYC6yDSCEm0jcJa4IyiWZsxvl3hcL2lgxSEPh R00/exCNvbHp5vutSJsP5TfZ4KRSb77DGc3XuSuoSQShOIcFlfgmXC+FzEvVD1MQ 5DUag8sBUQBf6CCgThxCr8RQtFUIXfkUKc3hXxk5q1MaynBf34Daf3t3KoHvCg75 nIB494gLtraMK8Mgr5n2INLX0S90/3Z6Dw2BL2qT1lhk6CRxTBLUcpDTfRjGpR3/ H0tWS+D4z4aDsoUiinWjOoL3kz4P+Su++3cmcD3/P1TdiPrMCPBTMMYQ3gc6ABSh /MxKig90iMFLO9BqEIVJ =wU7o -----END PGP SIGNATURE----- --iKuOIQTM119iSG5ueeLXFOTI03v2WK9fH--