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Thu, 12 Nov 2020 09:12:44 -0800 Envelope-to: git@xilinx.com, michal.simek@xilinx.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, hancock@sedsystems.ca, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Received: from [10.140.6.6] (port=44844 helo=xhdappanad40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1kdG9L-0005SG-DW; Thu, 12 Nov 2020 09:12:43 -0800 From: Srinivas Neeli To: , , , , , CC: , , , , Srinivas Neeli Subject: [LINUX PATCH V3 3/9] gpio: gpio-xilinx: Add clock support Date: Thu, 12 Nov 2020 22:42:22 +0530 Message-ID: <1605201148-4508-4-git-send-email-srinivas.neeli@xilinx.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1605201148-4508-1-git-send-email-srinivas.neeli@xilinx.com> References: <1605201148-4508-1-git-send-email-srinivas.neeli@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e3377617-93b6-4f8e-3c02-08d8872e4215 X-MS-TrafficTypeDiagnostic: BL0PR02MB5697: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:3383; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Nov 2020 17:13:21.8179 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3377617-93b6-4f8e-3c02-08d8872e4215 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: BL2NAM02FT008.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR02MB5697 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Adds clock support to the Xilinx GPIO driver. Signed-off-by: Srinivas Neeli --- Chnages in V3: -Created separate patch for Clock changes. --- drivers/gpio/gpio-xilinx.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index 17a8a8f90d84..99d603bfb6f0 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -38,6 +39,7 @@ * @gpio_state: GPIO state shadow register * @gpio_dir: GPIO direction shadow register * @gpio_lock: Lock used for synchronization + * @clk: clock resource for this driver */ struct xgpio_instance { struct gpio_chip gc; @@ -46,6 +48,7 @@ struct xgpio_instance { u32 gpio_state[2]; u32 gpio_dir[2]; spinlock_t gpio_lock[2]; + struct clk *clk; }; static inline int xgpio_index(struct xgpio_instance *chip, int gpio) @@ -333,11 +336,25 @@ static int xgpio_probe(struct platform_device *pdev) return PTR_ERR(chip->regs); } + chip->clk = devm_clk_get_optional(&pdev->dev, NULL); + if (IS_ERR(chip->clk)) { + if (PTR_ERR(chip->clk) != -EPROBE_DEFER) + dev_dbg(&pdev->dev, "Input clock not found\n"); + return PTR_ERR(chip->clk); + } + + status = clk_prepare_enable(chip->clk); + if (status < 0) { + dev_err(&pdev->dev, "Failed to prepare clk\n"); + return status; + } + xgpio_save_regs(chip); status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip); if (status) { dev_err(&pdev->dev, "failed to add GPIO chip\n"); + clk_disable_unprepare(chip->clk); return status; }