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Tue, 29 Sep 2020 05:46:56 -0800 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 29 Sep 2020 06:46:54 -0700 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 29 Sep 2020 21:46:51 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 29 Sep 2020 21:46:50 +0800 From: Crystal Guo To: , , Subject: [v5,2/3] reset-controller: ti: introduce a new reset handler Date: Tue, 29 Sep 2020 21:46:41 +0800 Message-ID: <20200929134642.26561-3-crystal.guo@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200929134642.26561-1-crystal.guo@mediatek.com> References: <20200929134642.26561-1-crystal.guo@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200929_094700_785972_C07F31CC X-CRM114-Status: GOOD ( 16.26 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@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, yong.liang@mediatek.com, stanley.chu@mediatek.com, srv_heupstream@mediatek.com, seiya.wang@mediatek.com, linux-kernel@vger.kernel.org, fan.chen@mediatek.com, Crystal Guo , linux-mediatek@lists.infradead.org, yingjoe.chen@mediatek.com, s-anna@ti.com, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org Introduce ti_syscon_reset() to integrate assert and deassert together. If some modules need do serialized assert and deassert operations to reset itself, reset_control_reset can be called for convenience. Such as reset-qcom-aoss.c, it integrates assert and deassert together by 'reset' method. MTK Socs also need this method to perform reset. Signed-off-by: Crystal Guo --- drivers/reset/reset-ti-syscon.c | 40 ++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c index a2635c21db7f..5d1f8306cd4f 100644 --- a/drivers/reset/reset-ti-syscon.c +++ b/drivers/reset/reset-ti-syscon.c @@ -15,15 +15,22 @@ * GNU General Public License for more details. */ +#include #include #include #include +#include #include #include #include #include +struct mediatek_reset_data { + unsigned char *reset_bits; + unsigned int reset_duration_us; +}; + /** * struct ti_syscon_reset_control - reset control structure * @assert_offset: reset assert control register offset from syscon base @@ -56,6 +63,7 @@ struct ti_syscon_reset_data { struct regmap *regmap; struct ti_syscon_reset_control *controls; unsigned int nr_controls; + const struct mediatek_reset_data *reset_data; }; #define to_ti_syscon_reset_data(rcdev) \ @@ -158,9 +166,29 @@ static int ti_syscon_reset_status(struct reset_controller_dev *rcdev, !(control->flags & STATUS_SET); } +static int ti_syscon_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct ti_syscon_reset_data *data = to_ti_syscon_reset_data(rcdev); + int ret; + + if (data->reset_data) { + ret = ti_syscon_reset_assert(rcdev, id); + if (ret) + return ret; + usleep_range(data->reset_data->reset_duration_us, + data->reset_data->reset_duration_us * 2); + + return ti_syscon_reset_deassert(rcdev, id); + } else { + return -ENOTSUPP; + } +} + static const struct reset_control_ops ti_syscon_reset_ops = { .assert = ti_syscon_reset_assert, .deassert = ti_syscon_reset_deassert, + .reset = ti_syscon_reset, .status = ti_syscon_reset_status, }; @@ -182,7 +210,11 @@ static int ti_syscon_reset_probe(struct platform_device *pdev) if (IS_ERR(regmap)) return PTR_ERR(regmap); - list = of_get_property(np, "ti,reset-bits", &size); + data->reset_data = of_device_get_match_data(&pdev->dev); + if (data->reset_data) + list = of_get_property(np, data->reset_data->reset_bits, &size); + else + list = of_get_property(np, "ti,reset-bits", &size); if (!list || (size / sizeof(*list)) % 7 != 0) { dev_err(dev, "invalid DT reset description\n"); return -EINVAL; @@ -217,8 +249,14 @@ static int ti_syscon_reset_probe(struct platform_device *pdev) return devm_reset_controller_register(dev, &data->rcdev); } +static const struct mediatek_reset_data mtk_reset_data = { + .reset_bits = "mediatek,reset-bits", + .reset_duration_us = 10, +}; + static const struct of_device_id ti_syscon_reset_of_match[] = { { .compatible = "ti,syscon-reset", }, + { .compatible = "mediatek,syscon-reset", .data = &mtk_reset_data}, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, ti_syscon_reset_of_match);