Lines Matching +full:spi +full:- +full:clk
1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
10 #include <linux/clk.h>
24 #include "stm32-dfsdm.h"
27 * struct stm32_dfsdm_dev_data - DFSDM compatible configuration data
97 unsigned int spi_clk_out_div; /* SPI clkout divider value */
100 struct clk *clk; /* DFSDM clock */ member
101 struct clk *aclk; /* audio clock */
114 ret = clk_prepare_enable(priv->clk); in stm32_dfsdm_clk_prepare_enable()
115 if (ret || !priv->aclk) in stm32_dfsdm_clk_prepare_enable()
118 ret = clk_prepare_enable(priv->aclk); in stm32_dfsdm_clk_prepare_enable()
120 clk_disable_unprepare(priv->clk); in stm32_dfsdm_clk_prepare_enable()
129 clk_disable_unprepare(priv->aclk); in stm32_dfsdm_clk_disable_unprepare()
130 clk_disable_unprepare(priv->clk); in stm32_dfsdm_clk_disable_unprepare()
134 * stm32_dfsdm_start_dfsdm - start global dfsdm interface.
142 struct device *dev = &priv->pdev->dev; in stm32_dfsdm_start_dfsdm()
143 unsigned int clk_div = priv->spi_clk_out_div, clk_src; in stm32_dfsdm_start_dfsdm()
146 if (atomic_inc_return(&priv->n_active_ch) == 1) { in stm32_dfsdm_start_dfsdm()
152 clk_src = priv->aclk ? 1 : 0; in stm32_dfsdm_start_dfsdm()
153 ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0), in stm32_dfsdm_start_dfsdm()
159 /* Output the SPI CLKOUT (if clk_div == 0 clock if OFF) */ in stm32_dfsdm_start_dfsdm()
160 ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0), in stm32_dfsdm_start_dfsdm()
167 ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0), in stm32_dfsdm_start_dfsdm()
175 atomic_read(&priv->n_active_ch)); in stm32_dfsdm_start_dfsdm()
182 atomic_dec(&priv->n_active_ch); in stm32_dfsdm_start_dfsdm()
189 * stm32_dfsdm_stop_dfsdm - stop global DFSDM interface.
199 if (atomic_dec_and_test(&priv->n_active_ch)) { in stm32_dfsdm_stop_dfsdm()
201 ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0), in stm32_dfsdm_stop_dfsdm()
207 /* Stop SPI CLKOUT */ in stm32_dfsdm_stop_dfsdm()
208 ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0), in stm32_dfsdm_stop_dfsdm()
214 pm_runtime_put_sync(&priv->pdev->dev); in stm32_dfsdm_stop_dfsdm()
216 dev_dbg(&priv->pdev->dev, "%s: n_active_ch %d\n", __func__, in stm32_dfsdm_stop_dfsdm()
217 atomic_read(&priv->n_active_ch)); in stm32_dfsdm_stop_dfsdm()
226 struct device_node *node = pdev->dev.of_node; in stm32_dfsdm_parse_of()
233 return -EINVAL; in stm32_dfsdm_parse_of()
235 priv->dfsdm.base = devm_platform_get_and_ioremap_resource(pdev, 0, in stm32_dfsdm_parse_of()
237 if (IS_ERR(priv->dfsdm.base)) in stm32_dfsdm_parse_of()
238 return PTR_ERR(priv->dfsdm.base); in stm32_dfsdm_parse_of()
240 priv->dfsdm.phys_base = res->start; in stm32_dfsdm_parse_of()
245 * the SPI clock out signal and internal processing, depending in stm32_dfsdm_parse_of()
248 priv->clk = devm_clk_get(&pdev->dev, "dfsdm"); in stm32_dfsdm_parse_of()
249 if (IS_ERR(priv->clk)) in stm32_dfsdm_parse_of()
250 return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk), in stm32_dfsdm_parse_of()
253 priv->aclk = devm_clk_get(&pdev->dev, "audio"); in stm32_dfsdm_parse_of()
254 if (IS_ERR(priv->aclk)) in stm32_dfsdm_parse_of()
255 priv->aclk = NULL; in stm32_dfsdm_parse_of()
257 if (priv->aclk) in stm32_dfsdm_parse_of()
258 clk_freq = clk_get_rate(priv->aclk); in stm32_dfsdm_parse_of()
260 clk_freq = clk_get_rate(priv->clk); in stm32_dfsdm_parse_of()
262 /* SPI clock out frequency */ in stm32_dfsdm_parse_of()
263 ret = of_property_read_u32(pdev->dev.of_node, "spi-max-frequency", in stm32_dfsdm_parse_of()
266 /* No SPI master mode */ in stm32_dfsdm_parse_of()
277 dev_err(&pdev->dev, "spi-max-frequency not achievable\n"); in stm32_dfsdm_parse_of()
278 return -EINVAL; in stm32_dfsdm_parse_of()
281 /* SPI clock output divider is: divider = CKOUTDIV + 1 */ in stm32_dfsdm_parse_of()
282 priv->spi_clk_out_div = divider - 1; in stm32_dfsdm_parse_of()
283 priv->dfsdm.spi_master_freq = clk_freq / (priv->spi_clk_out_div + 1); in stm32_dfsdm_parse_of()
286 dev_warn(&pdev->dev, "SPI clock not accurate\n"); in stm32_dfsdm_parse_of()
287 dev_warn(&pdev->dev, "%ld = %d * %d + %d\n", in stm32_dfsdm_parse_of()
288 clk_freq, spi_freq, priv->spi_clk_out_div + 1, rem); in stm32_dfsdm_parse_of()
296 .compatible = "st,stm32h7-dfsdm",
300 .compatible = "st,stm32mp1-dfsdm",
311 struct device_node *np = pdev->dev.of_node; in stm32_dfsdm_probe_identification()
313 struct stm32_dfsdm *dfsdm = &priv->dfsdm; in stm32_dfsdm_probe_identification()
318 if (!dev_data->ipid) { in stm32_dfsdm_probe_identification()
319 dfsdm->num_fls = dev_data->num_filters; in stm32_dfsdm_probe_identification()
320 dfsdm->num_chs = dev_data->num_channels; in stm32_dfsdm_probe_identification()
324 ret = regmap_read(dfsdm->regmap, DFSDM_IPIDR, &id); in stm32_dfsdm_probe_identification()
328 if (id != dev_data->ipid) { in stm32_dfsdm_probe_identification()
329 dev_err(&pdev->dev, "Unexpected IP version: 0x%x", id); in stm32_dfsdm_probe_identification()
330 return -EINVAL; in stm32_dfsdm_probe_identification()
342 ret = regmap_read(dfsdm->regmap, DFSDM_HWCFGR, &val); in stm32_dfsdm_probe_identification()
346 dfsdm->num_fls = FIELD_GET(DFSDM_HWCFGR_NBF_MASK, val); in stm32_dfsdm_probe_identification()
347 dfsdm->num_chs = FIELD_GET(DFSDM_HWCFGR_NBT_MASK, val); in stm32_dfsdm_probe_identification()
349 if (count > dfsdm->num_fls) { in stm32_dfsdm_probe_identification()
350 dev_err(&pdev->dev, "Unexpected child number: %d", count); in stm32_dfsdm_probe_identification()
351 return -EINVAL; in stm32_dfsdm_probe_identification()
354 ret = regmap_read(dfsdm->regmap, DFSDM_VERR, &val); in stm32_dfsdm_probe_identification()
358 dev_dbg(&pdev->dev, "DFSDM version: %lu.%lu. %d channels/%d filters\n", in stm32_dfsdm_probe_identification()
361 dfsdm->num_chs, dfsdm->num_fls); in stm32_dfsdm_probe_identification()
373 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); in stm32_dfsdm_probe()
375 return -ENOMEM; in stm32_dfsdm_probe()
377 priv->pdev = pdev; in stm32_dfsdm_probe()
379 dev_data = of_device_get_match_data(&pdev->dev); in stm32_dfsdm_probe()
381 dfsdm = &priv->dfsdm; in stm32_dfsdm_probe()
387 dfsdm->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dfsdm", in stm32_dfsdm_probe()
388 dfsdm->base, in stm32_dfsdm_probe()
389 dev_data->regmap_cfg); in stm32_dfsdm_probe()
390 if (IS_ERR(dfsdm->regmap)) { in stm32_dfsdm_probe()
391 ret = PTR_ERR(dfsdm->regmap); in stm32_dfsdm_probe()
392 dev_err(&pdev->dev, "%s: Failed to allocate regmap: %d\n", in stm32_dfsdm_probe()
401 dfsdm->fl_list = devm_kcalloc(&pdev->dev, dfsdm->num_fls, in stm32_dfsdm_probe()
402 sizeof(*dfsdm->fl_list), GFP_KERNEL); in stm32_dfsdm_probe()
403 if (!dfsdm->fl_list) in stm32_dfsdm_probe()
404 return -ENOMEM; in stm32_dfsdm_probe()
406 dfsdm->ch_list = devm_kcalloc(&pdev->dev, dfsdm->num_chs, in stm32_dfsdm_probe()
407 sizeof(*dfsdm->ch_list), GFP_KERNEL); in stm32_dfsdm_probe()
408 if (!dfsdm->ch_list) in stm32_dfsdm_probe()
409 return -ENOMEM; in stm32_dfsdm_probe()
415 dev_err(&pdev->dev, "Failed to start clock\n"); in stm32_dfsdm_probe()
419 pm_runtime_get_noresume(&pdev->dev); in stm32_dfsdm_probe()
420 pm_runtime_set_active(&pdev->dev); in stm32_dfsdm_probe()
421 pm_runtime_enable(&pdev->dev); in stm32_dfsdm_probe()
423 ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); in stm32_dfsdm_probe()
427 pm_runtime_put(&pdev->dev); in stm32_dfsdm_probe()
432 pm_runtime_disable(&pdev->dev); in stm32_dfsdm_probe()
433 pm_runtime_set_suspended(&pdev->dev); in stm32_dfsdm_probe()
434 pm_runtime_put_noidle(&pdev->dev); in stm32_dfsdm_probe()
444 pm_runtime_get_sync(&pdev->dev); in stm32_dfsdm_core_remove()
445 of_platform_depopulate(&pdev->dev); in stm32_dfsdm_core_remove()
446 pm_runtime_disable(&pdev->dev); in stm32_dfsdm_core_remove()
447 pm_runtime_set_suspended(&pdev->dev); in stm32_dfsdm_core_remove()
448 pm_runtime_put_noidle(&pdev->dev); in stm32_dfsdm_core_remove()
463 clk_unprepare(priv->clk); in stm32_dfsdm_core_suspend()
478 ret = clk_prepare(priv->clk); in stm32_dfsdm_core_resume()
512 .name = "stm32-dfsdm",