linux-kernel - Re: [PATCH RFC 4/5] drm/msm/hdmi: deprecate non standard clock-names

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Message-ID: <20150810133350.GC7302@ulmo.nvidia.com>
Date:	Mon, 10 Aug 2015 15:33:51 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	dri-devel@...ts.freedesktop.org, robdclark@...il.com,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH RFC 4/5] drm/msm/hdmi: deprecate non standard clock-names

On Mon, Aug 10, 2015 at 02:18:15PM +0100, Srinivas Kandagatla wrote:
> 
> 
> On 10/08/15 13:49, Thierry Reding wrote:
> >On Mon, Aug 10, 2015 at 12:59:49PM +0100, Srinivas Kandagatla wrote:
> >>This patch updates the bindings to discourage the usage of non standard
> >>clock names, this will help in projects focused on upstreaming.
> >>
> >>These deprecated properties are still supported but will be remove over
> >>the time.
> >>
> >>Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >>---
> >>  Documentation/devicetree/bindings/drm/msm/hdmi.txt | 16 ++++++++--------
> >>  1 file changed, 8 insertions(+), 8 deletions(-)
> >>
> >>diff --git a/Documentation/devicetree/bindings/drm/msm/hdmi.txt b/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> >>index 6dc202e..6fbfdd8 100644
> >>--- a/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> >>+++ b/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> >>@@ -12,16 +12,16 @@ Required properties:
> >>  - clocks: device clocks
> >>  - clock-names: Corresponding name for each entry in the clocks property.
> >>   for "qcom,hdmi-tx-8960" compatible names should be
> >>-	"core_clk"
> >>-	"master_iface_clk"
> >>-	"slave_iface_clk"
> >>+	"core_clk" is deprecated, use "core" instead
> >>+	"master_iface_clk" is deprecated, use "master_iface" instead
> >>+	"slave_iface_clk" is deprecated, use "slave_iface" instead
> >>
> >>   for "qcom,hdmi-tx-8084" and "qcom,hdmi-tx-8074" compatible names should be
> >>-	"extp_clk"
> >>-	"alt_iface_clk"
> >>-	"iface_clk"
> >>-	"core_clk"
> >>-	"mdp_core_clk"
> >>+	"extp_clk" is deprecated, use "extp" instead
> >>+	"alt_iface_clk" is deprecated, use "alt_iface" intstead
> >>+	"iface_clk" is deprecated, use "iface" instead
> >>+	"core_clk" is deprecated, use "core" instead
> >>+	"mdp_core_clk" is deprecated, use "mdp_core" instead
> >
> >Shouldn't there be a driver counterpart of this to accept the new names?
> Driver changes are in this same series "[PATCH RFC 5/5] drm/msm/hdmi: remove
> _clk suffix from clock names"(https://lkml.org/lkml/2015/8/10/453)

I don't have that patch in my inbox. It looks to be doing things
backwards (look up the deprecated name first). I think it should be:

	clk = devm_clk_get(dev, id);
	if (IS_ERR(clk)) {
		char clk_name[32];

		snprintf(clk_name, sizeof(clk_name), "%s_clk", id);
		clk = devm_clk_get(dev, clk_name);
		if (IS_ERR(clk))
			return clk;
	}

Also note how I've dropped the ERR_CAST(), that's not useful here
because you aren't actually casting, but simply returning clk.

Thierry

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