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b=iSOk2FvukenZIhqhGfIrnX/VSDBamlbyyWGKHtpIQC1setKc5+uuI+uetuhXwyqA4N x5TJn08HTFjWjq08ORg2Kr/9XvgQbDW3vizln4OfhQvIhjWjfvdcZjDqhnkTyeDmYqgU zvi3c/RrxnIRYxibj8UgxUyml75Q/aryZaQWD7OHWPTboeY+I6wCqAx7kPBsAyJQl19B fRTQ70ZLsB1vOdwneb8kxdL95GqvOzLAxAhiaYwan3/FaJ/kJomGnfEJH+vRoEUxjvsI hTQEPQTum2N3fCmLsTA5iOO4c+jst86qer86wdOGRwloo5RrkPTJR/vX+rqrl4h8JMmb 8noQ== X-Gm-Message-State: APjAAAUbfnZZ3Y+CyMQe0xAoYc/bnDBmyXwD2vTzpl+zwmvyOra9ri4Y RPbgxIoF38557mSDhX39DEhVhA== X-Google-Smtp-Source: APXvYqwobTrT91p21YyGnsEse1+RxzZxvnHAKh/XjPiTdvWC3iFSRE8s82N6n3Ie7F+FBFdVUvCVAQ== X-Received: by 2002:a62:ce07:: with SMTP id y7mr49658309pfg.12.1560225836465; Mon, 10 Jun 2019 21:03:56 -0700 (PDT) Received: from exogeni.mtv.corp.google.com ([2620:15c:202:1:5be8:f2a6:fd7b:7459]) by smtp.gmail.com with ESMTPSA id y133sm13301185pfb.28.2019.06.10.21.03.55 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 10 Jun 2019 21:03:55 -0700 (PDT) From: Derek Basehore To: linux-kernel@vger.kernel.org Subject: [PATCH 1/5] drm/panel: Add helper for reading DT rotation Date: Mon, 10 Jun 2019 21:03:46 -0700 Message-Id: <20190611040350.90064-2-dbasehore@chromium.org> X-Mailer: git-send-email 2.22.0.rc2.383.gf4fbbf30c2-goog In-Reply-To: <20190611040350.90064-1-dbasehore@chromium.org> References: <20190611040350.90064-1-dbasehore@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190610_210357_025769_585DDF48 X-CRM114-Status: GOOD ( 15.34 ) 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: Mark Rutland , devicetree@vger.kernel.org, Derek Basehore , Philipp Zabel , David Airlie , Sean Paul , intel-gfx@lists.freedesktop.org, Joonas Lahtinen , Maarten Lankhorst , Jani Nikula , Maxime Ripard , Rob Herring , Thierry Reding , dri-devel@lists.freedesktop.org, Daniel Vetter , Rodrigo Vivi , CK Hu , linux-mediatek@lists.infradead.org, Sam Ravnborg , linux-arm-kernel@lists.infradead.org, Matthias Brugger Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This adds a helper function for reading the rotation (panel orientation) from the device tree. Signed-off-by: Derek Basehore --- drivers/gpu/drm/drm_panel.c | 41 +++++++++++++++++++++++++++++++++++++ include/drm/drm_panel.h | 7 +++++++ 2 files changed, 48 insertions(+) diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index dbd5b873e8f2..3b689ce4a51a 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np) return ERR_PTR(-EPROBE_DEFER); } EXPORT_SYMBOL(of_drm_find_panel); + +/** + * of_drm_get_panel_orientation - look up the rotation of the panel using a + * device tree node + * @np: device tree node of the panel + * @orientation: orientation enum to be filled in + * + * Looks up the rotation of a panel in the device tree. The rotation in the + * device tree is counter clockwise. + * + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the + * rotation property doesn't exist. -EERROR otherwise. + */ +int of_drm_get_panel_orientation(const struct device_node *np, int *orientation) +{ + int rotation, ret; + + ret = of_property_read_u32(np, "rotation", &rotation); + if (ret == -EINVAL) { + /* Don't return an error if there's no rotation property. */ + *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN; + return 0; + } + + if (ret < 0) + return ret; + + if (rotation == 0) + *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL; + else if (rotation == 90) + *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP; + else if (rotation == 180) + *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP; + else if (rotation == 270) + *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP; + else + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(of_drm_get_panel_orientation); #endif MODULE_AUTHOR("Thierry Reding "); diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index 8c738c0e6e9f..13631b2efbaa 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel); #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL) struct drm_panel *of_drm_find_panel(const struct device_node *np); +int of_drm_get_panel_orientation(const struct device_node *np, + int *orientation); #else static inline struct drm_panel *of_drm_find_panel(const struct device_node *np) { return ERR_PTR(-ENODEV); } +int of_drm_get_panel_orientation(const struct device_node *np, + int *orientation) +{ + return -ENODEV; +} #endif #endif