From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753777AbaEJG77 (ORCPT ); Sat, 10 May 2014 02:59:59 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:35401 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751371AbaEJG7y (ORCPT ); Sat, 10 May 2014 02:59:54 -0400 X-AuditID: cbfee61a-b7f2b6d000006c4d-9c-536dce687e55 From: y@samsung.com To: linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: kgene.kim@samsung.com, t.figa@samsung.com, arnd@arndb.de, Pankaj Dubey , Rob Herring , Randy Dunlap , Wolfram Sang , Russell King , devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-i2c@vger.kernel.org Subject: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver Date: Sat, 10 May 2014 16:18:02 +0900 Message-id: <1399706287-13919-2-git-send-email-y@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1399706287-13919-1-git-send-email-y@samsung.com> References: <1399706287-13919-1-git-send-email-y@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrILMWRmVeSWpSXmKPExsVy+t9jAd2Mc7nBBi2/lC3+TjrGbjH/yDlW i94FV9ksNj2+xmqxsG0Ji0XH3y+MFpd3zWGzmHF+H5PF7cu8Fou2fmG3eHtnOotF694j7Bbr Z7xmsVh5YhazA59HS3MPm8fvX5MYPTav0PLYtKqTzWPzknqPvi2rGD1OnnrC4vF5k1wARxSX TUpqTmZZapG+XQJXxq4Xn1gKVplW7HxxnqWBcaV2FyMnh4SAicTOJTfYIWwxiQv31rOB2EIC ixgllh9262LkArLbmCQOLt7A1MXIwcEmICwx9YAWSI2IQLbElcb7zCA1zAIXmCQ6Ny8CaxYW 8JeYs+c0K4jNIqAqsez9f7AFvAK2Ejen7GMGmSMhoCAxZ5INSJhTwE7i2rZmFoi9thJTjh5m nMDIu4CRYRWjaGpBckFxUnquoV5xYm5xaV66XnJ+7iZGcMA+k9rBuLLB4hCjAAejEg9vwduc YCHWxLLiytxDjBIczEoivCsO5gYL8aYkVlalFuXHF5XmpBYfYpTmYFES5z3Qah0oJJCeWJKa nZpakFoEk2Xi4JRqYMxsPGD9kTNq75S9dbwGO/6/FzvoZ+ccG8+royjgH/605Wjm7Osdn5bu VgtfN3/roubL25cFNV+TCtNQDHqwPPj323czOlhKt1VcrrgoofJcazn3+1IbXbuZOx+WnRaO ev7i7q9arft1DZJS/w45LJM6EPvN8x5X/m1Gppl8PFnr7QJXzTG3XqjEUpyRaKjFXFScCAAY q9ngVAIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pankaj Dubey Let's handle i2c interrupt re-configuration in i2c driver. This will help us in removing some soc specific checks from machine files. Since only Exynos5250, and Exynos5420 need to do this, added syscon based phandle to i2c device nodes of respective SoC DT files. Also handle saving and restoring of SYS_I2C_CFG register during suspend and resume of i2c driver. This will help in removing soc specific check from mach-exynos/pm.c. CC: Rob Herring CC: Randy Dunlap CC: Wolfram Sang CC: Russell King CC: devicetree@vger.kernel.org CC: linux-doc@vger.kernel.org CC: linux-i2c@vger.kernel.org Signed-off-by: Pankaj Dubey --- .../devicetree/bindings/arm/samsung/sysreg.txt | 1 + arch/arm/boot/dts/exynos5.dtsi | 5 +++ arch/arm/boot/dts/exynos5250.dtsi | 4 +++ arch/arm/boot/dts/exynos5420.dtsi | 4 +++ drivers/i2c/busses/i2c-s3c2410.c | 32 ++++++++++++++++++++ 5 files changed, 46 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt b/Documentation/devicetree/bindings/arm/samsung/sysreg.txt index 0ab3251..fd71581 100644 --- a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt +++ b/Documentation/devicetree/bindings/arm/samsung/sysreg.txt @@ -3,6 +3,7 @@ SAMSUNG S5P/Exynos SoC series System Registers (SYSREG) Properties: - compatible : should contain "samsung,-sysreg", "syscon"; For Exynos4 SoC series it should be "samsung,exynos4-sysreg", "syscon"; + For Exynos5 SoC series it should be "samsung,exynos5-sysreg", "syscon"; - reg : offset and length of the register set. Example: diff --git a/arch/arm/boot/dts/exynos5.dtsi b/arch/arm/boot/dts/exynos5.dtsi index 79d0608..3027e37 100644 --- a/arch/arm/boot/dts/exynos5.dtsi +++ b/arch/arm/boot/dts/exynos5.dtsi @@ -99,4 +99,9 @@ #size-cells = <0>; status = "disabled"; }; + + sys_reg: syscon@10050000 { + compatible = "samsung,exynos5-sysreg", "syscon"; + reg = <0x10050000 0x400>; + }; }; diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi index 8d724d5..46f0233 100644 --- a/arch/arm/boot/dts/exynos5250.dtsi +++ b/arch/arm/boot/dts/exynos5250.dtsi @@ -285,6 +285,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c0_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -298,6 +299,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c1_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -311,6 +313,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c2_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -324,6 +327,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c3_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi index ff496ad..762128c 100644 --- a/arch/arm/boot/dts/exynos5420.dtsi +++ b/arch/arm/boot/dts/exynos5420.dtsi @@ -517,6 +517,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c0_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -530,6 +531,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c1_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -543,6 +545,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c2_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; @@ -556,6 +559,7 @@ clock-names = "i2c"; pinctrl-names = "default"; pinctrl-0 = <&i2c3_bus>; + samsung,syscon-phandle = <&sys_reg>; status = "disabled"; }; diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index ae44910..e707062 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -39,6 +39,8 @@ #include #include #include +#include +#include #include @@ -91,6 +93,9 @@ /* Max time to wait for bus to become idle after a xfer (in us) */ #define S3C2410_IDLE_TIMEOUT 5000 +/* Exynos5 Sysreg offset */ +#define EXYNOS5_SYS_I2C_CFG 0x0234 + /* i2c controller state */ enum s3c24xx_i2c_state { STATE_IDLE, @@ -127,6 +132,8 @@ struct s3c24xx_i2c { #if defined(CONFIG_ARM_S3C24XX_CPUFREQ) struct notifier_block freq_transition; #endif + struct regmap *sysreg; + unsigned int sys_i2s_cfg; }; static struct platform_device_id s3c24xx_driver_ids[] = { @@ -1075,6 +1082,8 @@ static void s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) { struct s3c2410_platform_i2c *pdata = i2c->pdata; + u32 val = 0; + int id; if (!np) return; @@ -1084,6 +1093,23 @@ s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr); of_property_read_u32(np, "samsung,i2c-max-bus-freq", (u32 *)&pdata->frequency); + /* + * Exynos5's legacy i2c controller and new high speed i2c + * controller have muxed interrupt sources. By default the + * interrupts for 4-channel HS-I2C controller are enabled. + * If node for first four channels of legacy i2c controller + * are available then re-configure the interrupts via the + * system register. + */ + id = of_alias_get_id(np, "i2c"); + i2c->sysreg = syscon_regmap_lookup_by_phandle(np, + "samsung,syscon-phandle"); + if (IS_ERR(i2c->sysreg)) { + /* As this is not compulsory do not return error */ + pr_info("i2c-%d skipping re-configuration of interrutps\n", id); + return; + } + regmap_update_bits(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val); } #else static void @@ -1268,6 +1294,9 @@ static int s3c24xx_i2c_suspend_noirq(struct device *dev) i2c->suspended = 1; + if (!IS_ERR(i2c->sysreg)) + regmap_read(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, &i2c->sys_i2s_cfg); + return 0; } @@ -1276,6 +1305,9 @@ static int s3c24xx_i2c_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); + if (!IS_ERR(i2c->sysreg)) + regmap_write(i2c->sysreg, i2c->sys_i2s_cfg, EXYNOS5_SYS_I2C_CFG); + i2c->suspended = 0; clk_prepare_enable(i2c->clk); s3c24xx_i2c_init(i2c); -- 1.7.10.4