* [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC @ 2021-07-02 6:54 WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 1/6] " WANG Xuerui ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, linux-mips, devicetree This patch series adds support for the RTC module found on various Loongson systems with the Loongson-2K SoC or the LS7A bridge chip. The driver is rewritten from an out-of-tree version to meet mainline standards. I write kernel code as a hobby, though, so there might still be overlooked issues. Any suggestions are welcome. This series is based on next-20210628, but should apply cleanly on rtc-next too. v5: - Minor changes per Nobuhiro-san's review - Simplified one register-write-and-return - Explicitly depend on OF, remove of_match_ptr usage for now - Tested on Loongson-3A4000; 2K should work too because there's no functional change either v4: - Rebased on top of next-20210628 - Added Jiaxun's Tested-by tag for Loongson-2K; no functional changes - Addressed all review comments from v3 - Rewritten field operations with FIELD_GET/FIELD_PREP - Removed all error logs - Removed unnecessary spinlocking (RTC core already protects against concurrent device file operations) v3: - Fixed compile error not discovered after rebase (blame sleep deprivation) - Tested on Loongson-3A4000 and Loongson-2K v2: - Rebased on top of latest linux-next - Updated Huacai's e-mail address to the kernel.org one - Added collected tags - Added adaptation for newly upstreamed Loongson-2K platforms WANG Xuerui (6): rtc: ls2x: Add support for the Loongson-2K/LS7A RTC dt-bindings: rtc: Add bindings for LS2X RTC MIPS: Loongson64: DTS: Add RTC support to LS7A MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig MIPS: Loongson64: DTS: Add RTC support to Loongson-2K MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig .../devicetree/bindings/rtc/trivial-rtc.yaml | 2 + .../boot/dts/loongson/loongson64-2k1000.dtsi | 5 + arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 5 + arch/mips/configs/loongson2k_defconfig | 1 + arch/mips/configs/loongson3_defconfig | 1 + drivers/rtc/Kconfig | 11 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ls2x.c | 180 ++++++++++++++++++ 8 files changed, 206 insertions(+) create mode 100644 drivers/rtc/rtc-ls2x.c base-commit: 3579aa488520feeda433ceca23ef4704bf8cd280 -- 2.30.1 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v5 1/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 2/6] dt-bindings: rtc: Add bindings for LS2X RTC WANG Xuerui ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, Huacai Chen, Jiaxun Yang, devicetree, linux-mips This RTC module is integrated into the Loongson-2K SoC and the LS7A bridge chip. This version is almost entirely rewritten to make use of current kernel API. Signed-off-by: Huacai Chen <chenhuacai@kernel.org> Signed-off-by: WANG Xuerui <git@xen0n.name> Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com> # loongson2k Cc: devicetree@vger.kernel.org Cc: linux-mips@vger.kernel.org --- drivers/rtc/Kconfig | 11 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ls2x.c | 180 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 192 insertions(+) create mode 100644 drivers/rtc/rtc-ls2x.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 12153d5801ce..8918b1d45976 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1304,6 +1304,17 @@ config RTC_DRV_NTXEC embedded controller found in certain e-book readers designed by the original design manufacturer Netronix. +config RTC_DRV_LS2X + tristate "Loongson LS2X RTC" + depends on OF && MACH_LOONGSON64 || COMPILE_TEST + select REGMAP_MMIO + help + If you say yes here you get support for the RTC on the Loongson-2K + SoC and LS7A bridge, which first appeared on the Loongson-2H. + + This driver can also be built as a module. If so, the module + will be called rtc-ls2x. + comment "on-CPU RTC drivers" config RTC_DRV_ASM9260 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 2dd0dd956b0e..6042ff1e73b7 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -81,6 +81,7 @@ obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o obj-$(CONFIG_RTC_DRV_LPC24XX) += rtc-lpc24xx.o obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o +obj-$(CONFIG_RTC_DRV_LS2X) += rtc-ls2x.o obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o obj-$(CONFIG_RTC_DRV_M41T93) += rtc-m41t93.o obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o diff --git a/drivers/rtc/rtc-ls2x.c b/drivers/rtc/rtc-ls2x.c new file mode 100644 index 000000000000..58901323b219 --- /dev/null +++ b/drivers/rtc/rtc-ls2x.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Loongson-2K/7A RTC driver + * + * Based on the original out-of-tree Loongson-2H RTC driver for Linux 2.6.32, + * by Shaozong Liu <liushaozong@loongson.cn>. + * + * Maintained out-of-tree by Huacai Chen <chenhuacai@kernel.org>. + * + * Rewritten for mainline by WANG Xuerui <git@xen0n.name>. + */ + +#include <linux/bitfield.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/rtc.h> + +#define TOY_TRIM_REG 0x20 +#define TOY_WRITE0_REG 0x24 +#define TOY_WRITE1_REG 0x28 +#define TOY_READ0_REG 0x2c +#define TOY_READ1_REG 0x30 +#define TOY_MATCH0_REG 0x34 +#define TOY_MATCH1_REG 0x38 +#define TOY_MATCH2_REG 0x3c +#define RTC_CTRL_REG 0x40 +#define RTC_TRIM_REG 0x60 +#define RTC_WRITE0_REG 0x64 +#define RTC_READ0_REG 0x68 +#define RTC_MATCH0_REG 0x6c +#define RTC_MATCH1_REG 0x70 +#define RTC_MATCH2_REG 0x74 + +#define TOY_MON GENMASK(31, 26) +#define TOY_DAY GENMASK(25, 21) +#define TOY_HOUR GENMASK(20, 16) +#define TOY_MIN GENMASK(15, 10) +#define TOY_SEC GENMASK(9, 4) +#define TOY_MSEC GENMASK(3, 0) + +struct ls2x_rtc_priv { + struct regmap *regmap; +}; + +static const struct regmap_config ls2x_rtc_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +struct ls2x_rtc_regs { + u32 reg0; + u32 reg1; +}; + +static inline void ls2x_rtc_regs_to_time(struct ls2x_rtc_regs *regs, + struct rtc_time *tm) +{ + tm->tm_year = regs->reg1; + tm->tm_sec = FIELD_GET(TOY_SEC, regs->reg0); + tm->tm_min = FIELD_GET(TOY_MIN, regs->reg0); + tm->tm_hour = FIELD_GET(TOY_HOUR, regs->reg0); + tm->tm_mday = FIELD_GET(TOY_DAY, regs->reg0); + tm->tm_mon = FIELD_GET(TOY_MON, regs->reg0) - 1; +} + +static inline void ls2x_rtc_time_to_regs(struct rtc_time *tm, + struct ls2x_rtc_regs *regs) +{ + regs->reg0 = FIELD_PREP(TOY_SEC, tm->tm_sec); + regs->reg0 |= FIELD_PREP(TOY_MIN, tm->tm_min); + regs->reg0 |= FIELD_PREP(TOY_HOUR, tm->tm_hour); + regs->reg0 |= FIELD_PREP(TOY_DAY, tm->tm_mday); + regs->reg0 |= FIELD_PREP(TOY_MON, tm->tm_mon + 1); + regs->reg1 = tm->tm_year; +} + +static int ls2x_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); + struct ls2x_rtc_regs regs; + int ret; + + ret = regmap_read(priv->regmap, TOY_READ1_REG, ®s.reg1); + if (unlikely(ret)) + return ret; + + ret = regmap_read(priv->regmap, TOY_READ0_REG, ®s.reg0); + if (unlikely(ret)) + return ret; + + ls2x_rtc_regs_to_time(®s, tm); + + return 0; +} + +static int ls2x_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); + struct ls2x_rtc_regs regs; + int ret; + + ls2x_rtc_time_to_regs(tm, ®s); + + ret = regmap_write(priv->regmap, TOY_WRITE0_REG, regs.reg0); + if (unlikely(ret)) + return ret; + + return regmap_write(priv->regmap, TOY_WRITE1_REG, regs.reg1); +} + +static struct rtc_class_ops ls2x_rtc_ops = { + .read_time = ls2x_rtc_read_time, + .set_time = ls2x_rtc_set_time, +}; + +static int ls2x_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rtc_device *rtc; + struct ls2x_rtc_priv *priv; + void __iomem *regs; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (unlikely(!priv)) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + priv->regmap = devm_regmap_init_mmio(dev, regs, + &ls2x_rtc_regmap_config); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + rtc = devm_rtc_allocate_device(dev); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + rtc->ops = &ls2x_rtc_ops; + + /* Due to hardware erratum, all years multiple of 4 are considered + * leap year, so only years 2000 through 2099 are usable. + * + * Previous out-of-tree versions of this driver wrote tm_year directly + * into the year register, so epoch 2000 must be used to preserve + * semantics on shipped systems. + */ + rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + rtc->range_max = RTC_TIMESTAMP_END_2099; + + return devm_rtc_register_device(rtc); +} + +static const struct of_device_id ls2x_rtc_of_match[] = { + { .compatible = "loongson,ls2x-rtc" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match); + +static struct platform_driver ls2x_rtc_driver = { + .probe = ls2x_rtc_probe, + .driver = { + .name = "ls2x-rtc", + .of_match_table = ls2x_rtc_of_match, + }, +}; + +module_platform_driver(ls2x_rtc_driver); + +MODULE_DESCRIPTION("LS2X RTC driver"); +MODULE_AUTHOR("WANG Xuerui"); +MODULE_AUTHOR("Huacai Chen"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ls2x-rtc"); -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v5 2/6] dt-bindings: rtc: Add bindings for LS2X RTC 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 1/6] " WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 3/6] MIPS: Loongson64: DTS: Add RTC support to LS7A WANG Xuerui ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, Rob Herring, Rob Herring, devicetree Document the binding for the LS2X RTC block found on the Loongson-2K SoC and the LS7A bridge, originally appearing on the Loongson-2H. Signed-off-by: WANG Xuerui <git@xen0n.name> Acked-by: Rob Herring <robh@kernel.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org --- Documentation/devicetree/bindings/rtc/trivial-rtc.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml index 7548d8714871..568aa89989fe 100644 --- a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml +++ b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml @@ -42,6 +42,8 @@ properties: - isil,isl1218 # Intersil ISL12022 Real-time Clock - isil,isl12022 + # Loongson LS2X RTC + - loongson,ls2x-rtc # Real Time Clock Module with I2C-Bus - microcrystal,rv3028 # Real Time Clock Module with I2C-Bus -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v5 3/6] MIPS: Loongson64: DTS: Add RTC support to LS7A 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 1/6] " WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 2/6] dt-bindings: rtc: Add bindings for LS2X RTC WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 4/6] MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig WANG Xuerui ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, Jiaxun Yang, Rob Herring, devicetree, linux-mips The LS7A RTC module is now supported, enable it. Signed-off-by: WANG Xuerui <git@xen0n.name> Acked-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org Cc: linux-mips@vger.kernel.org --- arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi index 2f45fce2cdc4..82035de4774f 100644 --- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi +++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi @@ -19,6 +19,11 @@ pic: interrupt-controller@10000000 { #interrupt-cells = <2>; }; + rtc0: rtc@100d0100 { + compatible = "loongson,ls2x-rtc"; + reg = <0 0x100d0100 0 0x78>; + }; + ls7a_uart0: serial@10080000 { compatible = "ns16550a"; reg = <0 0x10080000 0 0x100>; -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v5 4/6] MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui ` (2 preceding siblings ...) 2021-07-02 6:54 ` [PATCH v5 3/6] MIPS: Loongson64: DTS: Add RTC support to LS7A WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 5/6] MIPS: Loongson64: DTS: Add RTC support to Loongson-2K WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 6/6] MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig WANG Xuerui 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, linux-mips This is now supported, enable for Loongson-3 systems. Other systems are unaffected. Signed-off-by: WANG Xuerui <git@xen0n.name> Cc: linux-mips@vger.kernel.org --- arch/mips/configs/loongson3_defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/mips/configs/loongson3_defconfig b/arch/mips/configs/loongson3_defconfig index f02101ff04b3..fccb6906d4b4 100644 --- a/arch/mips/configs/loongson3_defconfig +++ b/arch/mips/configs/loongson3_defconfig @@ -320,6 +320,7 @@ CONFIG_USB_SERIAL_OPTION=m CONFIG_RTC_CLASS=y CONFIG_RTC_DRV_CMOS=y CONFIG_RTC_DRV_GOLDFISH=y +CONFIG_RTC_DRV_LS2X=y CONFIG_DMADEVICES=y CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_BALLOON=m -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v5 5/6] MIPS: Loongson64: DTS: Add RTC support to Loongson-2K 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui ` (3 preceding siblings ...) 2021-07-02 6:54 ` [PATCH v5 4/6] MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 6/6] MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig WANG Xuerui 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, Jiaxun Yang, Rob Herring, devicetree, linux-mips The Loongson-2K RTC module is now supported, enable it. The MMIO address is unclear from the Loongson 2K1000 user manual, I took it from Loongson's out-of-tree fork of Linux 4.19. Signed-off-by: WANG Xuerui <git@xen0n.name> Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com> # loongson2k Cc: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org Cc: linux-mips@vger.kernel.org --- arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi index bfc3d3243ee7..4a04e1dc5fda 100644 --- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi +++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi @@ -52,6 +52,11 @@ package0: bus@10000000 { 0 0x40000000 0 0x40000000 0 0x40000000 0xfe 0x00000000 0xfe 0x00000000 0 0x40000000>; + rtc0: rtc@1fe07800 { + compatible = "loongson,ls2x-rtc"; + reg = <0 0x1fe07800 0 0x78>; + }; + liointc0: interrupt-controller@1fe11400 { compatible = "loongson,liointc-2.0"; reg = <0 0x1fe11400 0 0x40>, -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v5 6/6] MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui ` (4 preceding siblings ...) 2021-07-02 6:54 ` [PATCH v5 5/6] MIPS: Loongson64: DTS: Add RTC support to Loongson-2K WANG Xuerui @ 2021-07-02 6:54 ` WANG Xuerui 5 siblings, 0 replies; 7+ messages in thread From: WANG Xuerui @ 2021-07-02 6:54 UTC (permalink / raw) To: linux-rtc; +Cc: WANG Xuerui, Jiaxun Yang, linux-mips This is now supported, enable for Loongson-2K systems. Other systems are unaffected. Signed-off-by: WANG Xuerui <git@xen0n.name> Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com> # loongson2k Cc: linux-mips@vger.kernel.org --- arch/mips/configs/loongson2k_defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/mips/configs/loongson2k_defconfig b/arch/mips/configs/loongson2k_defconfig index e948ca487e2d..e15f34857956 100644 --- a/arch/mips/configs/loongson2k_defconfig +++ b/arch/mips/configs/loongson2k_defconfig @@ -280,6 +280,7 @@ CONFIG_USB_SERIAL=m CONFIG_USB_SERIAL_OPTION=m CONFIG_RTC_CLASS=y CONFIG_RTC_DRV_CMOS=y +CONFIG_RTC_DRV_LS2X=y CONFIG_DMADEVICES=y # CONFIG_CPU_HWMON is not set CONFIG_PM_DEVFREQ=y -- 2.30.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-07-02 6:55 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-07-02 6:54 [PATCH v5 0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 1/6] " WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 2/6] dt-bindings: rtc: Add bindings for LS2X RTC WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 3/6] MIPS: Loongson64: DTS: Add RTC support to LS7A WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 4/6] MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 5/6] MIPS: Loongson64: DTS: Add RTC support to Loongson-2K WANG Xuerui 2021-07-02 6:54 ` [PATCH v5 6/6] MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig WANG Xuerui
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