Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753399AbbBSRJC (ORCPT ); Thu, 19 Feb 2015 12:09:02 -0500 Received: from mail-wg0-f44.google.com ([74.125.82.44]:34106 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752922AbbBSRI7 (ORCPT ); Thu, 19 Feb 2015 12:08:59 -0500 From: Srinivas Kandagatla To: linux-arm-kernel@lists.infradead.org Cc: Maxime Ripard , Rob Herring , Pawel Moll , Kumar Gala , linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Stephen Boyd , Arnd Bergmann , broonie@kernel.org, Greg Kroah-Hartman , Srinivas Kandagatla Subject: [RFC PATCH 3/3] eeprom: qfprom: Add Qualcomm QFPROM support. Date: Thu, 19 Feb 2015 17:08:51 +0000 Message-Id: <1424365731-26768-1-git-send-email-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1424365639-26634-1-git-send-email-srinivas.kandagatla@linaro.org> References: <1424365639-26634-1-git-send-email-srinivas.kandagatla@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3790 Lines: 128 This patch adds QFPROM support driver which is used by other drivers like thermal sensor and cpufreq. On MSM parts there are some efuses (called qfprom) these fuses store things like calibration data, speed bins.. etc. Drivers like cpufreq, thermal sensors would read out this data for configuring the driver. Signed-off-by: Srinivas Kandagatla --- drivers/eeprom/Kconfig | 6 ++++ drivers/eeprom/Makefile | 1 + drivers/eeprom/qfprom.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 82 insertions(+) create mode 100644 drivers/eeprom/qfprom.c diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig index 39235a9..b0c94cb 100644 --- a/drivers/eeprom/Kconfig +++ b/drivers/eeprom/Kconfig @@ -26,4 +26,10 @@ config EEPROM_SUNXI_SID This driver can also be built as a module. If so, the module will be called sunxi_sid. +config QCOM_QFPROM + tristate "QCOM QFPROM Support" + depends on EEPROM + help + Say y here to enable QFPROM support. The QFPROM provides access + functions for QFPROM data to rest of the drivers via eeprom interface. endif diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile index 661422c..f99c824 100644 --- a/drivers/eeprom/Makefile +++ b/drivers/eeprom/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_EEPROM) += core.o # Devices obj-$(CONFIG_EEPROM_SUNXI_SID) += eeprom-sunxi-sid.o +obj-$(CONFIG_QCOM_QFPROM) += qfprom.o diff --git a/drivers/eeprom/qfprom.c b/drivers/eeprom/qfprom.c new file mode 100644 index 0000000..da31b36 --- /dev/null +++ b/drivers/eeprom/qfprom.c @@ -0,0 +1,75 @@ +#include +#include +#include +#include +#include +#include + +static struct regmap_config qfprom_regmap_config = { + .reg_bits = 32, + .val_bits = 8, + .reg_stride = 1, +}; + +static int qfprom_remove(struct platform_device *pdev) +{ + struct eeprom_device *eeprom = platform_get_drvdata(pdev); + + return eeprom_unregister(eeprom); +} + +static int qfprom_probe(struct platform_device *pdev) +{ + struct resource *res; + void __iomem *base; + struct device *dev = &pdev->dev; + struct eeprom_device *eeprom; + int rval; + + eeprom = devm_kzalloc(dev, sizeof(*eeprom), GFP_KERNEL); + if (!eeprom) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + qfprom_regmap_config.max_register = resource_size(res) - 1; + + eeprom->regmap = devm_regmap_init_mmio(dev, base, + &qfprom_regmap_config); + if (IS_ERR(eeprom->regmap)) { + dev_err(dev, "regmap init failed\n"); + return PTR_ERR(eeprom->regmap); + } + + eeprom->dev = dev; + eeprom->stride = qfprom_regmap_config.reg_stride; + eeprom->size = resource_size(res) - 1; + rval = eeprom_register(eeprom); + if (rval) + return rval; + + platform_set_drvdata(pdev, eeprom); + return 0; +} + +static const struct of_device_id qfprom_of_match[] = { + { .compatible = "qcom,qfprom"}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, qfprom_of_match); + +static struct platform_driver qfprom_driver = { + .probe = qfprom_probe, + .remove = qfprom_remove, + .driver = { + .name = "qcom,qfprom", + .of_match_table = qfprom_of_match, + }, +}; +module_platform_driver(qfprom_driver); +MODULE_AUTHOR("Srinivas Kandagatla "); +MODULE_DESCRIPTION("Qualcomm QFPROM driver"); +MODULE_LICENSE("GPL2"); -- 1.9.1 -- 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/