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dmarc=none action=none header.from=nxp.com; Received: from AM6PR04MB4966.eurprd04.prod.outlook.com (2603:10a6:20b:2::14) by AM6PR0402MB3669.eurprd04.prod.outlook.com (2603:10a6:209:1a::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3589.30; Tue, 24 Nov 2020 10:25:16 +0000 Received: from AM6PR04MB4966.eurprd04.prod.outlook.com ([fe80::3cfc:a92e:75ad:ce4a]) by AM6PR04MB4966.eurprd04.prod.outlook.com ([fe80::3cfc:a92e:75ad:ce4a%3]) with mapi id 15.20.3564.029; Tue, 24 Nov 2020 10:25:16 +0000 From: Dong Aisheng To: linux-clk@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, sudipm.mukherjee@gmail.com, sboyd@kernel.org, shawnguo@kernel.org, linux-pm@vger.kernel.org, dongas86@gmail.com, Dong Aisheng Subject: [PATCH 2/3] firmware: imx: scu-pd: export SCU PD register status Date: Tue, 24 Nov 2020 18:08:01 +0800 Message-Id: <20201124100802.22775-3-aisheng.dong@nxp.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20201124100802.22775-1-aisheng.dong@nxp.com> References: <20201124100802.22775-1-aisheng.dong@nxp.com> X-Originating-IP: [119.31.174.66] X-ClientProxiedBy: SG2PR02CA0054.apcprd02.prod.outlook.com (2603:1096:4:54::18) To AM6PR04MB4966.eurprd04.prod.outlook.com (2603:10a6:20b:2::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from b29396-OptiPlex-7040.ap.freescale.net (119.31.174.66) by SG2PR02CA0054.apcprd02.prod.outlook.com (2603:1096:4:54::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3589.20 via Frontend Transport; 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Export an API for SCU clk driver to query the status in order to support -EPROBE_DEFER properly. Link: https://lore.kernel.org/patchwork/patch/1334670/ Signed-off-by: Dong Aisheng --- drivers/firmware/imx/scu-pd.c | 20 +++++++++++++++++++- include/linux/firmware/imx/sci.h | 6 ++++++ 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/imx/scu-pd.c b/drivers/firmware/imx/scu-pd.c index 946eea292b52..53b49ef20014 100644 --- a/drivers/firmware/imx/scu-pd.c +++ b/drivers/firmware/imx/scu-pd.c @@ -86,6 +86,20 @@ struct imx_sc_pd_soc { u8 num_ranges; }; +bool imx_scu_pd_initialized; + +/* + * SCU clock-controller (SCU clock protocol) does not have a power domain + * property in DT, but the sub clocks registered requires power domain to + * be ready first. Export an API for SCU clk driver to query the status in + * order to support -EPROBE_DEFER properly. + */ +bool imx_scu_pd_is_initialized(void) +{ + return imx_scu_pd_initialized; +} +EXPORT_SYMBOL_GPL(imx_scu_pd_is_initialized); + static const struct imx_sc_pd_range imx8qxp_scu_pd_ranges[] = { /* LSIO SS */ { "pwm", IMX_SC_R_PWM_0, 8, true, 0 }, @@ -351,7 +365,11 @@ static int imx_sc_pd_probe(struct platform_device *pdev) if (!pd_soc) return -ENODEV; - return imx_scu_init_pm_domains(&pdev->dev, pd_soc); + ret = imx_scu_init_pm_domains(&pdev->dev, pd_soc); + if (!ret) + imx_scu_pd_initialized = true; + + return ret; } static const struct of_device_id imx_sc_pd_match[] = { diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h index 5cc63fe7e84d..0eaf00ad6305 100644 --- a/include/linux/firmware/imx/sci.h +++ b/include/linux/firmware/imx/sci.h @@ -22,6 +22,7 @@ int imx_scu_irq_register_notifier(struct notifier_block *nb); int imx_scu_irq_unregister_notifier(struct notifier_block *nb); int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable); int imx_scu_soc_init(struct device *dev); +bool imx_scu_pd_is_initialized(void); #else static inline int imx_scu_soc_init(struct device *dev) { @@ -47,5 +48,10 @@ static inline int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable) { return -ENOTSUPP; } + +static inline bool imx_scu_pd_is_initialized(void) +{ + return false; +} #endif #endif /* _SC_SCI_H */