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FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: KHpsYYFDncUvaVwKLHjExZ5xzCR6k1iTdNu2X0PkcMrk/2M4w+brLxNDP47BC8cPhRrlNXOUeISMQYM6V7PXROcya6l3o9lUecy8RZOYATrLT39spdtt8iUWWkwuK5j7yVks/ISV/el7QMXSLAe9vd12T6MyRbYxiIFPRhUNA/iJ0CEl1lv0pss7QNrv5L7qfrE6Ru69hiWzf5MTnHzHQq2B7AMBICrzt95Nz9RPCAjOA28bqlUVQuFEhXNPhmDadZZpBpn41PPuXY+Xyzc635XarLHT649GDADKv9R5dU0CVNnUTNVWpGxOmj6Pw0WpIsoFT9lvIsYEu+Ulc4E4g9ncVs9VwVpcuDNaMZ0Px7qvyhq1U5pU3t5ZbpvZxCbO71zg3QeJNhortRR5+1GtIiLwkCcXKJOHyEfVIqEmoxM= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: c9ebcfba-213a-467a-394b-08d680eadf09 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jan 2019 04:25:53.5410 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB5319 Cc: Palmer Dabbelt , U-Boot Mailing List , Alexander Graf , Christoph Hellwig , Paul Walmsley Subject: [U-Boot] [PATCH v3 07/12] clk: Add fixed-factor clock driver X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.18 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" This patch adds fixed-factor clock driver which derives clock rate by dividing (div) and multiplying (mult) fixed factors to a parent clock. Signed-off-by: Atish Patra Signed-off-by: Anup Patel --- drivers/clk/Makefile | 4 +- drivers/clk/clk_fixed_factor.c | 72 ++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/clk_fixed_factor.c diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 2f4446568c..fa59259ea3 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -4,7 +4,9 @@ # Wolfgang Denk, DENX Software Engineering, wd@denx.de. # -obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o clk_fixed_rate.o +obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o +obj-$(CONFIG_$(SPL_TPL_)CLK) += clk_fixed_rate.o +obj-$(CONFIG_$(SPL_TPL_)CLK) += clk_fixed_factor.o obj-y += imx/ obj-y += tegra/ diff --git a/drivers/clk/clk_fixed_factor.c b/drivers/clk/clk_fixed_factor.c new file mode 100644 index 0000000000..f2630248c2 --- /dev/null +++ b/drivers/clk/clk_fixed_factor.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2019 Western Digital Corporation or its affiliates. + * + * Author: Anup Patel + */ + +#include +#include +#include +#include + +struct clk_fixed_factor { + struct clk parent; + unsigned int div; + unsigned int mult; +}; + +#define to_clk_fixed_factor(dev) \ + ((struct clk_fixed_factor *)dev_get_platdata(dev)) + +static ulong clk_fixed_factor_get_rate(struct clk *clk) +{ + int ret; + struct clk_fixed_factor *ff = to_clk_fixed_factor(clk->dev); + + if (clk->id != 0) + return -EINVAL; + + ret = clk_get_rate(&ff->parent); + if (IS_ERR_VALUE(ret)) + return ret; + + do_div(ret, ff->div); + + return ret * ff->mult; +} + +const struct clk_ops clk_fixed_factor_ops = { + .get_rate = clk_fixed_factor_get_rate, +}; + +static int clk_fixed_factor_ofdata_to_platdata(struct udevice *dev) +{ + int err; + struct clk_fixed_factor *ff = to_clk_fixed_factor(dev); + + err = clk_get_by_index(dev, 0, &ff->parent); + if (err) + return err; + + ff->div = dev_read_u32_default(dev, "clock-div", 1); + ff->mult = dev_read_u32_default(dev, "clock-mult", 1); + + return 0; +} + +static const struct udevice_id clk_fixed_factor_match[] = { + { + .compatible = "fixed-factor-clock", + }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(clk_fixed_factor) = { + .name = "fixed_factor_clock", + .id = UCLASS_CLK, + .of_match = clk_fixed_factor_match, + .ofdata_to_platdata = clk_fixed_factor_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct clk_fixed_factor), + .ops = &clk_fixed_factor_ops, +};