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Dong" To: "linux-clk@vger.kernel.org" CC: "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "sboyd@kernel.org" , "mturquette@baylibre.com" , "shawnguo@kernel.org" , Anson Huang , Jacky Bai , dl-linux-imx , "A.s. Dong" , Stephen Boyd Subject: [PATCH V5 2/9] clk: fractional-divider: add CLK_FRAC_DIVIDER_ZERO_BASED flag support Thread-Topic: [PATCH V5 2/9] clk: fractional-divider: add CLK_FRAC_DIVIDER_ZERO_BASED flag support Thread-Index: AQHUeQJ4H7M6grlas06Jaqx6sohrOA== Date: Sat, 10 Nov 2018 14:34:21 +0000 Message-ID: <1541860165-401-3-git-send-email-aisheng.dong@nxp.com> References: <1541860165-401-1-git-send-email-aisheng.dong@nxp.com> In-Reply-To: <1541860165-401-1-git-send-email-aisheng.dong@nxp.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK0P153CA0032.APCP153.PROD.OUTLOOK.COM (2603:1096:203:17::20) To AM0PR04MB4211.eurprd04.prod.outlook.com (2603:10a6:208:66::21) authentication-results: spf=none (sender IP is ) smtp.mailfrom=aisheng.dong@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.66] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;AM0PR04MB4402;6:+ozK55O+3VqilAlUZVHLeZrOAuz6ArWE8M2vM7oZPH/7r+CeW2auNR/bo/Y2mUUzA1ayQHKwXCsdcIo21BnoGnbI08lKzkDor6lDP4RiuioJR4JpFCzhd5dgOibeVDVlgsNZ1ni4gDL1Zv2aRFMwNwuSe2MaW2TczkWZa0rfCHyIqXQ4j3rAwuEq8LF4MtDwRldp+ML9/8xN27ydwBvc1y+nEFGrGXxpfDgaNqEE5lLpRRjR+eitZpsT1XCFxQLrnjEb2HTrfBJqmwMQNJtG2gaoHSxdnqAr8bVphtoqsoUHYt6laI7MoFriepCKP34l9IpDWDZWYQXE684P8utaxUugQnK6hYmGsADg3DDLd/tdY/9HgDFRjDUEpP+wnZHAl3WVOL2pJFcZIUma2Umb7pB/q5ubGDLFpF3CzDI9EMZ1ZAyEZn1zuRnZQ15gtowotn08yPgH6pwZ37+0wFulkA==;5:aRIcqoW0/en8DLyHnzBpES8n3z8xeJBUYuGmtqzlN90DqfuHal4FWYjmcQ1nymB651DXej9AWnUTdutZAXF4Tvt7IVfHlLqgqV9au+ovg7saO4pBzyC0V/WaS1CSgz+zXFDUJG5wJlfEx+ZN1mwFu38IgEQpplm+Mg0bKNYita0=;7:9IZV4xQMesGwY8GaZMRsXrIUY2cZjzyXUQpLt1Ih9r/7K8XJxIrtlpR9lWvPYt4IGuI27WwU6RHDL5WM22lb6xW8haGJBiE64zTqVsCXO+KQ63BmggRJ0ayJDQ+ooCPYvx1xu/YYaQeJKeQPq6Ww9A== x-ms-office365-filtering-correlation-id: df712d3a-fcd4-4854-bec4-08d647199a90 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390040)(7020095)(4652040)(8989299)(5600074)(711020)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7153060)(7193020);SRVR:AM0PR04MB4402; x-ms-traffictypediagnostic: AM0PR04MB4402: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(185117386973197); x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(8121501046)(5005006)(10201501046)(3002001)(3231382)(944501410)(52105095)(93006095)(93001095)(6055026)(148016)(149066)(150057)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123560045)(20161123558120)(20161123562045)(201708071742011)(7699051)(76991095);SRVR:AM0PR04MB4402;BCL:0;PCL:0;RULEID:;SRVR:AM0PR04MB4402; x-forefront-prvs: 0852EB6797 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(39860400002)(396003)(366004)(346002)(376002)(136003)(199004)(189003)(54534003)(6512007)(478600001)(102836004)(36756003)(14444005)(4326008)(105586002)(256004)(76176011)(97736004)(71200400001)(71190400001)(106356001)(14454004)(386003)(6506007)(52116002)(2351001)(5660300001)(25786009)(5640700003)(2906002)(81166006)(81156014)(66066001)(6436002)(26005)(186003)(6916009)(8676002)(54906003)(8936002)(3846002)(305945005)(486006)(7736002)(6116002)(2900100001)(446003)(11346002)(68736007)(53936002)(476003)(2501003)(99286004)(6486002)(50226002)(2616005)(316002)(86362001);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB4402;H:AM0PR04MB4211.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: YOobZqJtXG7ujdE4OqBC5/kNBOaKdIJuu+SfAgoRkw6lryki+eYvcxiGGVVwQvyNtexffm8Ed4pY/ABCjW6Y/lvf8WmvDrpXOvuxr+jXSMLA2bI3Xh6jmPUfVMPNUbLkFdpk+T+vdWI3FATHYt2Jt19065ky+xs2KaCXuQSSQu4UaOmGYHyOfEamzL+cwZysV6Vnjaq1ZoEAayMoiqA+Mz9N5EsY9cTRPWEICcpiWKf6q73BijHoGq1BvJlLMLRrE1t/QLqa9K6xD2UuEXXY/1SFrMgJi1l/Wq5g3MoOYk2beONgYVcW+nM/yjQyicCIMOPaqbAvfo7f/ZQuxKuz/lAj6bDezV6lX9NQ7gzaaAM= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: df712d3a-fcd4-4854-bec4-08d647199a90 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Nov 2018 14:34:21.5027 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4402 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Adding CLK_FRAC_DIVIDER_ZERO_BASED flag to indicate the numerator and denominator value in register are start from 0. This can be used to support frac dividers like below: Divider output clock = Divider input clock x [(frac +1) / (div +1)] where frac/div in register is: 000b - Divide by 1. 001b - Divide by 2. 010b - Divide by 3. Cc: Stephen Boyd Cc: Michael Turquette Signed-off-by: Dong Aisheng --- ChangeLog: v3->v4: * no changes v2->v3: * no changes v1->v2: * improve comments suggested by Stephen --- drivers/clk/clk-fractional-divider.c | 10 ++++++++++ include/linux/clk-provider.h | 8 ++++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c index fdf625f..7ccde6b 100644 --- a/drivers/clk/clk-fractional-divider.c +++ b/drivers/clk/clk-fractional-divider.c @@ -40,6 +40,11 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw, m = (val & fd->mmask) >> fd->mshift; n = (val & fd->nmask) >> fd->nshift; + if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) { + m++; + n++; + } + if (!n || !m) return parent_rate; @@ -103,6 +108,11 @@ static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate, GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0), &m, &n); + if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) { + m--; + n--; + } + if (fd->lock) spin_lock_irqsave(fd->lock, flags); else diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 08f135a..90d7c26 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -603,6 +603,12 @@ void clk_hw_unregister_fixed_factor(struct clk_hw *hw); * @lock: register lock * * Clock with adjustable fractional divider affecting its output frequency. + * + * Flags: + * CLK_FRAC_DIVIDER_ZERO_BASED - by default the numerator and denominator + * is the value read from the register. If CLK_FRAC_DIVIDER_ZERO_BASED + * is set then the numerator and denominator are both the value read + * plus one. */ struct clk_fractional_divider { struct clk_hw hw; @@ -622,6 +628,8 @@ struct clk_fractional_divider { #define to_clk_fd(_hw) container_of(_hw, struct clk_fractional_divider, hw) +#define CLK_FRAC_DIVIDER_ZERO_BASED BIT(0) + extern const struct clk_ops clk_fractional_divider_ops; struct clk *clk_register_fractional_divider(struct device *dev, const char *name, const char *parent_name, unsigned long flags,