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Mon, 16 Sep 2019 13:55:45 +0000 From: Gareth Williams To: "laurent.pinchart@ideasonboard.com" , "kieran.bingham+renesas@ideasonboard.com" CC: "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , Geert Uytterhoeven , Phil Edworthy , Fabrizio Castro Subject: DRM Driver implementation question Thread-Topic: DRM Driver implementation question Thread-Index: AdVslX1ZBzegHzojRVS64lgG04s8jg== Date: Mon, 16 Sep 2019 13:55:45 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=gareth.williams.jx@renesas.com; x-originating-ip: [193.141.220.21] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 77e73d7f-9dc0-4037-0885-08d73aad928d x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600167)(711020)(4605104)(1401327)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:TY2PR01MB2604; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-Network-Message-Id: 77e73d7f-9dc0-4037-0885-08d73aad928d X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Sep 2019 13:55:45.5196 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Hc6SQAo0ptW1Zg77KQIHKsu7buYJB0CKRbr49TGlKjkDfD7iJMfo4aDXWVi8qzWyxo2FpG8GBT5nKS+rQxLpV8LCU0S32caD7ma9odcfx+0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY2PR01MB2604 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Laurent/Kieran, I need to upstream a driver for a display controller that within its regist= ers memory region contains registers related to a PWM device. The PWM devic= e is for controlling the backlight of the display. Ideally, I would like to create a separated driver for the PWM, so that I c= an re-use "pwm-backlight", but since the registers for the PWM are right in= the middle of the registers for the display controller I would need to ior= emap the memory region for the PWM registers region twice, once from the di= splay controller driver, and once from the PWM driver. Do you think that the double ioremap would be acceptable upstream? Kind Regards, Gareth=09