Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933531AbaFQO6D (ORCPT ); Tue, 17 Jun 2014 10:58:03 -0400 Received: from mirror2.csie.ntu.edu.tw ([140.112.30.76]:41387 "EHLO mirror2.csie.ntu.edu.tw" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933161AbaFQOx3 (ORCPT ); Tue, 17 Jun 2014 10:53:29 -0400 From: Chen-Yu Tsai To: Greg Kroah-Hartman , Samuel Ortiz , Lee Jones , Maxime Ripard , Rob Herring , Mike Turquette , Emilio Lopez , Linus Walleij Cc: Chen-Yu Tsai , linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Boris BREZILLON , Luc Verhaegen Subject: [PATCH v2 09/20] clk: sunxi: Add sun6i MBUS clock support Date: Tue, 17 Jun 2014 22:52:46 +0800 Message-Id: <1403016777-15121-10-git-send-email-wens@csie.org> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1403016777-15121-1-git-send-email-wens@csie.org> References: <1403016777-15121-1-git-send-email-wens@csie.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Chen-Yu Tsai --- Documentation/devicetree/bindings/clock/sunxi.txt | 1 + drivers/clk/sunxi/clk-sunxi.c | 44 +++++++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index b9ec668..7b2ba41 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -40,6 +40,7 @@ Required properties: "allwinner,sun6i-a31-apb2-div-clk" - for the APB2 gates on A31 "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31 "allwinner,sun4i-a10-mod0-clk" - for the module 0 family of clocks + "allwinner,sun6i-a31-mbus-clk" - for the MBUS clocks on A31 / A23 "allwinner,sun7i-a20-out-clk" - for the external output clocks "allwinner,sun7i-a20-gmac-clk" - for the GMAC clock module on A20/A31 "allwinner,sun4i-a10-usb-clk" - for usb gates + resets on A10 / A20 diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index eca3c6e..a086b5b 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -307,6 +307,37 @@ static void sun4i_get_mod0_factors(u32 *freq, u32 parent_rate, /** + * sun6i_a31_get_mbus_factors() - calculates m factor for MBUS clocks + * MBUS rate is calculated as follows + * rate = parent_rate / (m + 1); + */ + +static void sun6i_a31_get_mbus_factors(u32 *freq, u32 parent_rate, + u8 *n, u8 *k, u8 *m, u8 *p) +{ + u8 div; + + /* These clocks can only divide, so we will never be able to achieve + * frequencies higher than the parent frequency */ + if (*freq > parent_rate) + *freq = parent_rate; + + div = DIV_ROUND_UP(parent_rate, *freq); + + if (div > 8) + div = 8; + + *freq = parent_rate / div; + + /* we were called to round the frequency, we can now return */ + if (n == NULL) + return; + + *m = div - 1; +} + + +/** * sun7i_a20_get_out_factors() - calculates m, p factors for CLK_OUT_A/B * CLK_OUT rate is calculated as follows * rate = (parent_rate >> p) / (m + 1); @@ -447,6 +478,11 @@ static struct clk_factors_config sun4i_mod0_config = { .pwidth = 2, }; +static struct clk_factors_config sun6i_a31_mbus_config = { + .mshift = 0, + .mwidth = 3, +}; + /* user manual says "n" but it's really "p" */ static struct clk_factors_config sun7i_a20_out_config = { .mshift = 8, @@ -505,6 +541,13 @@ static const struct factors_data sun4i_mod0_data __initconst = { .getter = sun4i_get_mod0_factors, }; +static const struct factors_data sun6i_a31_mbus_data __initconst = { + .enable = 31, + .mux = 24, + .table = &sun6i_a31_mbus_config, + .getter = sun6i_a31_get_mbus_factors, +}; + static const struct factors_data sun7i_a20_out_data __initconst = { .enable = 31, .mux = 24, @@ -1099,6 +1142,7 @@ static const struct of_device_id clk_factors_match[] __initconst = { {.compatible = "allwinner,sun6i-a31-pll6-clk", .data = &sun6i_a31_pll6_data,}, {.compatible = "allwinner,sun4i-a10-apb1-clk", .data = &sun4i_apb1_data,}, {.compatible = "allwinner,sun4i-a10-mod0-clk", .data = &sun4i_mod0_data,}, + {.compatible = "allwinner,sun6i-a31-mbus-clk", .data = &sun6i_a31_mbus_data,}, {.compatible = "allwinner,sun7i-a20-out-clk", .data = &sun7i_a20_out_data,}, {} }; -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/