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Tue, 20 Aug 2019 19:24:24 +0000 Subject: Re: [PATCH v3 2/9] soc: samsung: Convert exynos-chipid driver to use the regmap API To: Sylwester Nawrocki , References: <20190813150827.31972-1-s.nawrocki@samsung.com> <20190813150827.31972-3-s.nawrocki@samsung.com> From: Jon Hunter Message-ID: Date: Tue, 20 Aug 2019 20:24:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190813150827.31972-3-s.nawrocki@samsung.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To DRHQMAIL107.nvidia.com (10.27.9.16) Content-Language: en-US DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1566329066; bh=aqrV0qozQvPyCJF5OMU0O0mUi+RuzpeTvQFTlPYLGYo=; h=X-PGP-Universal:Subject:To:CC:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=k+uQ9whCpdQaPncRO5pqbWY5peXZs4u76HSG7FdTncaFHyBVBUU0+VUmNGh9l9uZf rpeWK8ybyj9BjBvzww8775rlL+xFRbAdnnTVOBDBMWnpyymV0Nnhrsa5laXm4Hk3qD pZ1wGU6rKdyQAowtuZcJ0eS5DEAA91UoASJ7hFBMi3BIgQwcv7WgObfF73CRAdTfBW pjAUvOqjr6lPkT/PyLVElqPjTsAjP0Ftpf96uHk8GNi8f3BSD5Zq2keebN1h20A4U9 ScTNMW3THbcgO4H9B/gbFW1EJ323YLHH/MOahU6KmAH/fuSUpSLLER37mWG1YWVC+M z7KT+ONPzKgTw== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190820_122427_548886_7BCE99E9 X-CRM114-Status: GOOD ( 19.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org, pankaj.dubey@samsung.com, b.zolnierkie@samsung.com, linux-kernel@vger.kernel.org, robh+dt@kernel.org, kgene@kernel.org, vireshk@kernel.org, linux-tegra , linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 13/08/2019 16:08, Sylwester Nawrocki wrote: > Convert the driver to use regmap API in order to allow other > drivers, like ASV, to access the CHIPID registers. > > This patch adds definition of selected CHIPID register offsets > and register bit fields for Exynos5422 SoC. > > Signed-off-by: Sylwester Nawrocki > --- > Changes since v2: > - s/_EXYNOS_ASV_H/__LINU_SOC_EXYNOS_ASV_H, > - removed __func__ from error log, > - removed unneeded header inclusion. > > Changes since v1 (RFC): > - new patch > --- > drivers/soc/samsung/exynos-chipid.c | 34 ++++++--------- > include/linux/soc/samsung/exynos-chipid.h | 52 +++++++++++++++++++++++ > 2 files changed, 65 insertions(+), 21 deletions(-) > create mode 100644 include/linux/soc/samsung/exynos-chipid.h > > diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c > index bcf691f2b650..006a95feb618 100644 > --- a/drivers/soc/samsung/exynos-chipid.c > +++ b/drivers/soc/samsung/exynos-chipid.c > @@ -9,16 +9,13 @@ > */ > > #include > +#include > #include > -#include > +#include > #include > +#include > #include > > -#define EXYNOS_SUBREV_MASK (0xF << 4) > -#define EXYNOS_MAINREV_MASK (0xF << 0) > -#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK) > -#define EXYNOS_MASK 0xFFFFF000 > - > static const struct exynos_soc_id { > const char *name; > unsigned int id; > @@ -51,29 +48,24 @@ static const char * __init product_id_to_soc_id(unsigned int product_id) > int __init exynos_chipid_early_init(void) > { > struct soc_device_attribute *soc_dev_attr; > - void __iomem *exynos_chipid_base; > struct soc_device *soc_dev; > struct device_node *root; > - struct device_node *np; > + struct regmap *regmap; > u32 product_id; > u32 revision; > + int ret; > > - /* look up for chipid node */ > - np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-chipid"); > - if (!np) > - return -ENODEV; > - > - exynos_chipid_base = of_iomap(np, 0); > - of_node_put(np); > - > - if (!exynos_chipid_base) { > - pr_err("Failed to map SoC chipid\n"); > - return -ENXIO; > + regmap = syscon_regmap_lookup_by_compatible("samsung,exynos4210-chipid"); > + if (IS_ERR(regmap)) { > + pr_err("Failed to get CHIPID regmap\n"); > + return PTR_ERR(regmap); > } Following this change, I am now seeing the above error on our Tegra boards where this driver is enabled. This is triggering a kernel warnings test we have to fail. Hence, I don't think that you can remove the compatible node test here, unless you have a better way to determine if this is a samsung device. Cheers Jon -- nvpublic _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel