From mboxrd@z Thu Jan 1 00:00:00 1970 From: wsa@the-dreams.de (Wolfram Sang) Date: Fri, 21 Nov 2014 08:25:45 +0100 Subject: [PATCH v4 1/2] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver In-Reply-To: <1414656270-8048-2-git-send-email-pankaj.dubey@samsung.com> References: <1414656270-8048-1-git-send-email-pankaj.dubey@samsung.com> <1414656270-8048-2-git-send-email-pankaj.dubey@samsung.com> Message-ID: <20141121072545.GG1480@katana> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Oct 30, 2014 at 01:34:29PM +0530, Pankaj Dubey wrote: > Let's handle i2c interrupt re-configuration in i2c driver. This will > help us in removing some soc specific checks from machine files and > will help in removing static iomapping of SYS register in exynos.c > > Since only Exynos5250, and Exynos5420 has i2c nodes in DT, 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. > > CC: Rob Herring > CC: Randy Dunlap > CC: Wolfram Sang > CC: Russell King > CC: devicetree at vger.kernel.org > CC: linux-doc at vger.kernel.org > CC: linux-i2c at vger.kernel.org > Signed-off-by: Pankaj Dubey > --- > .../devicetree/bindings/i2c/i2c-s3c2410.txt | 1 + > arch/arm/boot/dts/exynos5250.dtsi | 4 +++ > arch/arm/boot/dts/exynos5420.dtsi | 4 +++ I usually don't take DTS patches. They should go via arm-soc. Please say so if there are reasons I should take them. > @@ -1084,6 +1092,23 @@ 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 s/node/nodes/ > + * 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,sysreg-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); I'd say drop this message. If you want to keep it, it should be dev_dbg. > + return; > + } > + regmap_update_bits(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), 0); > } Rest looks good, thanks! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: