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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id o14sm2895434pjp.29.2019.07.03.14.45.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Jul 2019 14:45:15 -0700 (PDT) From: Jeffrey Hugo To: broonie@kernel.org Cc: a.hajda@samsung.com, Laurent.pinchart@ideasonboard.com, airlied@linux.ie, daniel@ffwll.ch, robdclark@gmail.com, bjorn.andersson@linaro.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH 1/2] regmap: Add DSI bus support Date: Wed, 3 Jul 2019 14:45:12 -0700 Message-Id: <20190703214512.41319-1-jeffrey.l.hugo@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190703214326.41269-1-jeffrey.l.hugo@gmail.com> References: <20190703214326.41269-1-jeffrey.l.hugo@gmail.com> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add basic support with a simple implementation that utilizes the generic read/write commands to allow device registers to be configured. Signed-off-by: Jeffrey Hugo --- drivers/base/regmap/Kconfig | 6 +++- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-dsi.c | 62 ++++++++++++++++++++++++++++++++ include/linux/regmap.h | 37 +++++++++++++++++++ 4 files changed, 105 insertions(+), 1 deletion(-) create mode 100644 drivers/base/regmap/regmap-dsi.c diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index c8bbf5322720..27669afa9d95 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -4,7 +4,7 @@ # subsystems should select the appropriate symbols. config REGMAP - default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_I3C) + default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_I3C || REGMAP_DSI) select IRQ_DOMAIN if REGMAP_IRQ bool @@ -53,3 +53,7 @@ config REGMAP_SCCB config REGMAP_I3C tristate depends on I3C + +config REGMAP_DSI + tristate + depends on DRM_MIPI_DSI diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index ff6c7d8ec1cd..c1cc81f3986f 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_REGMAP_W1) += regmap-w1.o obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o +obj-$(CONFIG_REGMAP_DSI) += regmap-dsi.o diff --git a/drivers/base/regmap/regmap-dsi.c b/drivers/base/regmap/regmap-dsi.c new file mode 100644 index 000000000000..0c2900e2fee0 --- /dev/null +++ b/drivers/base/regmap/regmap-dsi.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Register map access API - DSI support +// +// Copyright (c) 2019 Jeffrey Hugo + +#include +#include +#include + +#include "internal.h" + +static int dsi_reg_write(void *context, unsigned int reg, unsigned int val) +{ + struct device *dev = context; + struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); + char payload[2]; + int ret; + + payload[0] = (char)reg; + payload[1] = (char)val; + + ret = mipi_dsi_generic_write(dsi, payload, 2); + return ret < 0 ? ret : 0; +} + +static int dsi_reg_read(void *context, unsigned int reg, unsigned int *val) +{ + struct device *dev = context; + struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); + int ret; + + ret = mipi_dsi_generic_read(dsi, ®, 1, val, 1); + return ret < 0 ? ret : 0; +} + +static struct regmap_bus dsi_bus = { + .reg_write = dsi_reg_write, + .reg_read = dsi_reg_read, +}; + +struct regmap *__regmap_init_dsi(struct mipi_dsi_device *dsi, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + return __regmap_init(&dsi->dev, &dsi_bus, &dsi->dev, config, + lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__regmap_init_dsi); + +struct regmap *__devm_regmap_init_dsi(struct mipi_dsi_device *dsi, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + return __devm_regmap_init(&dsi->dev, &dsi_bus, &dsi->dev, config, + lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__devm_regmap_init_dsi); + +MODULE_LICENSE("GPL"); diff --git a/include/linux/regmap.h b/include/linux/regmap.h index dfe493ac692d..858239f7859f 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -32,6 +32,7 @@ struct regmap_range_cfg; struct regmap_field; struct snd_ac97; struct sdw_slave; +struct mipi_dsi_device; /* An enum of all the supported cache types */ enum regcache_type { @@ -573,6 +574,10 @@ struct regmap *__regmap_init_sdw(struct sdw_slave *sdw, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +struct regmap *__regmap_init_dsi(struct mipi_dsi_device *dsi, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name); struct regmap *__devm_regmap_init(struct device *dev, const struct regmap_bus *bus, @@ -626,6 +631,10 @@ struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +struct regmap *__devm_regmap_init_dsi(struct mipi_dsi_device *dsi, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name); /* * Wrapper for regmap_init macros to include a unique lockdep key and name * for each call. No-op if CONFIG_LOCKDEP is not set. @@ -812,6 +821,19 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg); __regmap_lockdep_wrapper(__regmap_init_sdw, #config, \ sdw, config) +/** + * regmap_init_dsi() - Initialise register map + * + * @dsi: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +#define regmap_init_dsi(dsi, config) \ + __regmap_lockdep_wrapper(__regmap_init_dsi, #config, \ + dsi, config) + /** * devm_regmap_init() - Initialise managed register map @@ -999,6 +1021,21 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg); __regmap_lockdep_wrapper(__devm_regmap_init_i3c, #config, \ i3c, config) +/** + * devm_regmap_init_dsi() - Initialise managed register map + * + * @dsi: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer + * to a struct regmap. The regmap will be automatically freed by the + * device management code. + */ +#define devm_regmap_init_dsi(dsi, config) \ + __regmap_lockdep_wrapper(__devm_regmap_init_dsi, #config, \ + dsi, config) + + int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk); void regmap_mmio_detach_clk(struct regmap *map); void regmap_exit(struct regmap *map); -- 2.17.1