From mboxrd@z Thu Jan 1 00:00:00 1970 From: laurent.pinchart@ideasonboard.com (Laurent Pinchart) Date: Tue, 27 Feb 2018 12:29:56 +0200 Subject: [PATCH] bridge: Elaborate a bit on dumb VGA bridges in Kconfig In-Reply-To: <20180227101200.6173-1-linus.walleij@linaro.org> References: <20180227101200.6173-1-linus.walleij@linaro.org> Message-ID: <3059596.rN0KS1vdqv@avalon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Linus, Thank you for the patch. On Tuesday, 27 February 2018 12:12:00 EET Linus Walleij wrote: > It's better if we explain a bit that this pertains to > passive VGA DAC bridges. > > Signed-off-by: Linus Walleij > --- > drivers/gpu/drm/bridge/Kconfig | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig > index 3b99d5a06c16..7cee8f291e7f 100644 > --- a/drivers/gpu/drm/bridge/Kconfig > +++ b/drivers/gpu/drm/bridge/Kconfig > @@ -30,7 +30,8 @@ config DRM_DUMB_VGA_DAC > depends on OF > select DRM_KMS_HELPER > help > - Support for RGB to VGA DAC based bridges > + Support for passive RGB to VGA DAC based bridges such > + as ADI ADV7123 or TI THS8134 and THS8135. Strictly speaking none of those components are passive: https:// en.wikipedia.org/wiki/Electronic_component#Passive_components. Only the VGA DACs based on resistor ladders (such as the one Maxime initially developed this driver for, see https://en.wikipedia.org/wiki/Resistor_ladder#R %E2%80%932R_resistor_ladder_network_(digital_to_analog_conversion)) can be considered passive devices. > config DRM_LVDS_ENCODER > tristate "Transparent parallel to LVDS encoder support" -- Regards, Laurent Pinchart From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: Re: [PATCH] bridge: Elaborate a bit on dumb VGA bridges in Kconfig Date: Tue, 27 Feb 2018 12:29:56 +0200 Message-ID: <3059596.rN0KS1vdqv@avalon> References: <20180227101200.6173-1-linus.walleij@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from galahad.ideasonboard.com (galahad.ideasonboard.com [185.26.127.97]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4FE4F6E628 for ; Tue, 27 Feb 2018 10:29:08 +0000 (UTC) In-Reply-To: <20180227101200.6173-1-linus.walleij@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Linus Walleij Cc: linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org SGkgTGludXMsCgpUaGFuayB5b3UgZm9yIHRoZSBwYXRjaC4KCk9uIFR1ZXNkYXksIDI3IEZlYnJ1 YXJ5IDIwMTggMTI6MTI6MDAgRUVUIExpbnVzIFdhbGxlaWogd3JvdGU6Cj4gSXQncyBiZXR0ZXIg aWYgd2UgZXhwbGFpbiBhIGJpdCB0aGF0IHRoaXMgcGVydGFpbnMgdG8KPiBwYXNzaXZlIFZHQSBE QUMgYnJpZGdlcy4KPiAKPiBTaWduZWQtb2ZmLWJ5OiBMaW51cyBXYWxsZWlqIDxsaW51cy53YWxs ZWlqQGxpbmFyby5vcmc+Cj4gLS0tCj4gIGRyaXZlcnMvZ3B1L2RybS9icmlkZ2UvS2NvbmZpZyB8 IDMgKystCj4gIDEgZmlsZSBjaGFuZ2VkLCAyIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkK PiAKPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2JyaWRnZS9LY29uZmlnIGIvZHJpdmVy cy9ncHUvZHJtL2JyaWRnZS9LY29uZmlnCj4gaW5kZXggM2I5OWQ1YTA2YzE2Li43Y2VlOGYyOTFl N2YgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9ncHUvZHJtL2JyaWRnZS9LY29uZmlnCj4gKysrIGIv ZHJpdmVycy9ncHUvZHJtL2JyaWRnZS9LY29uZmlnCj4gQEAgLTMwLDcgKzMwLDggQEAgY29uZmln IERSTV9EVU1CX1ZHQV9EQUMKPiAgCWRlcGVuZHMgb24gT0YKPiAgCXNlbGVjdCBEUk1fS01TX0hF TFBFUgo+ICAJaGVscAo+IC0JICBTdXBwb3J0IGZvciBSR0IgdG8gVkdBIERBQyBiYXNlZCBicmlk Z2VzCj4gKwkgIFN1cHBvcnQgZm9yIHBhc3NpdmUgUkdCIHRvIFZHQSBEQUMgYmFzZWQgYnJpZGdl cyBzdWNoCj4gKwkgIGFzIEFESSBBRFY3MTIzIG9yIFRJIFRIUzgxMzQgYW5kIFRIUzgxMzUuCgpT dHJpY3RseSBzcGVha2luZyBub25lIG9mIHRob3NlIGNvbXBvbmVudHMgYXJlIHBhc3NpdmU6IGh0 dHBzOi8vCmVuLndpa2lwZWRpYS5vcmcvd2lraS9FbGVjdHJvbmljX2NvbXBvbmVudCNQYXNzaXZl X2NvbXBvbmVudHMuIE9ubHkgdGhlIFZHQSAKREFDcyBiYXNlZCBvbiByZXNpc3RvciBsYWRkZXJz IChzdWNoIGFzIHRoZSBvbmUgTWF4aW1lIGluaXRpYWxseSBkZXZlbG9wZWQgCnRoaXMgZHJpdmVy IGZvciwgc2VlIGh0dHBzOi8vZW4ud2lraXBlZGlhLm9yZy93aWtpL1Jlc2lzdG9yX2xhZGRlciNS CiVFMiU4MCU5MzJSX3Jlc2lzdG9yX2xhZGRlcl9uZXR3b3JrXyhkaWdpdGFsX3RvX2FuYWxvZ19j b252ZXJzaW9uKSkgY2FuIGJlIApjb25zaWRlcmVkIHBhc3NpdmUgZGV2aWNlcy4KCj4gIGNvbmZp ZyBEUk1fTFZEU19FTkNPREVSCj4gIAl0cmlzdGF0ZSAiVHJhbnNwYXJlbnQgcGFyYWxsZWwgdG8g TFZEUyBlbmNvZGVyIHN1cHBvcnQiCgotLSAKUmVnYXJkcywKCkxhdXJlbnQgUGluY2hhcnQKCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBt YWlsaW5nIGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3Rz LmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo=