| Message ID | 1581434955-11087-1-git-send-email-vbadigan@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [V1] dt-bindings: mmc: sdhci-msm: Add CQE reg map | expand |
Hi, On Tue, Feb 11, 2020 at 7:29 AM Veerabhadrarao Badiganti <vbadigan@codeaurora.org> wrote: > > CQE feature has been enabled on sdhci-msm. Add CQE reg map > that needs to be supplied for supporting CQE feature. > > Change-Id: I788c4bd5b7cbca16bc1030a410cc5550ed7204e1 > Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > --- > Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > index 7ee639b..eaa0998 100644 > --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > @@ -27,6 +27,11 @@ Required properties: > - reg: Base address and length of the register in the following order: > - Host controller register map (required) > - SD Core register map (required for msm-v4 and below) > + - CQE register map (Optional, needed only for eMMC and msm-v4.2 above) I did a quick search and it appears that SD cards implementing 6.0 of the spec can also use CQE. Is that correct? If so, maybe remove the part about "eMMC"? Maybe also change "needed" to "useful" to make it clear that this entry isn't actually required for all msm-v4.2 controllers? > +- reg-names: When CQE register map is supplied, below reg-names are required > + - "hc_mem" for Host controller register map > + - "core_mem" for SD cpre regoster map s/regoster/register > + - "cqhci_mem" for CQE register map I'm at least slightly confused. You say that reg-names are there only if CQE register map is supplied. ...and that requires 4.2 and above. ...but "core_mem" is only there on 4.0 and below. So there should never be a "core_mem" entry? Trying to specify that sanely in free-form text seems like it's gonna be hard and not worth it. You should probably transition to yaml first? I will also note that Rob isn't a huge fan of "reg-names". In a different conversation I think you mentioned you had a reason for having it. I guess just be prepared to defend yourself against Rob if you feel strongly about keeping reg-names. -Doug
On 2/11/2020 10:12 PM, Doug Anderson wrote: > Hi, > > On Tue, Feb 11, 2020 at 7:29 AM Veerabhadrarao Badiganti > <vbadigan@codeaurora.org> wrote: >> CQE feature has been enabled on sdhci-msm. Add CQE reg map >> that needs to be supplied for supporting CQE feature. >> >> Change-Id: I788c4bd5b7cbca16bc1030a410cc5550ed7204e1 >> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> >> --- >> Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt >> index 7ee639b..eaa0998 100644 >> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt >> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt >> @@ -27,6 +27,11 @@ Required properties: >> - reg: Base address and length of the register in the following order: >> - Host controller register map (required) >> - SD Core register map (required for msm-v4 and below) >> + - CQE register map (Optional, needed only for eMMC and msm-v4.2 above) > I did a quick search and it appears that SD cards implementing 6.0 of > the spec can also use CQE. Is that correct? If so, maybe remove the > part about "eMMC"? On qcom platforms, only SDHC instance meant for eMMC has the CQE support. So mentioned that its needed only for eMMC. > > Maybe also change "needed" to "useful" to make it clear that this > entry isn't actually required for all msm-v4.2 controllers? sure. > >> +- reg-names: When CQE register map is supplied, below reg-names are required >> + - "hc_mem" for Host controller register map >> + - "core_mem" for SD cpre regoster map > s/regoster/register > > >> + - "cqhci_mem" for CQE register map > I'm at least slightly confused. You say that reg-names are there only > if CQE register map is supplied. ...and that requires 4.2 and above. > ...but "core_mem" is only there on 4.0 and below. So there should > never be a "core_mem" entry? core_mem is present till <v5.0 cqhci_mem is present on >=v4.2 Say, for version v4.2 both are present; .... and for v5.0 only cqhci_mem is present. Both hc reg-map and core reg-map are being accessed through index. So no need to list the reg names 'hc_mem' & 'core_mem' in general. But coming to cqhci reg-map we can't access it with fixed index, since its index varies between 1/2 based on controller version. So we are accessing it through reg-names. Since reg-names has to be associated with corresponding reg maps, other two reg-names (hc_mem & core_mem) also need to br listed when cqhci_mem is listed. That is the reason, I mentioned it like these are needed only cqe reg map is supplied. If it is creating confusion, i will remove that statement. > Trying to specify that sanely in free-form text seems like it's gonna > be hard and not worth it. You should probably transition to yaml > first? > > > I will also note that Rob isn't a huge fan of "reg-names". In a > different conversation I think you mentioned you had a reason for > having it. I guess just be prepared to defend yourself against Rob if > you feel strongly about keeping reg-names. Sure. Its the same reason mentioned in above comment. > > -Doug
Hi, On Wed, Feb 12, 2020 at 4:00 AM Veerabhadrarao Badiganti <vbadigan@codeaurora.org> wrote: > > > On 2/11/2020 10:12 PM, Doug Anderson wrote: > > Hi, > > > > On Tue, Feb 11, 2020 at 7:29 AM Veerabhadrarao Badiganti > > <vbadigan@codeaurora.org> wrote: > >> CQE feature has been enabled on sdhci-msm. Add CQE reg map > >> that needs to be supplied for supporting CQE feature. > >> > >> Change-Id: I788c4bd5b7cbca16bc1030a410cc5550ed7204e1 > >> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > >> --- > >> Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 5 +++++ > >> 1 file changed, 5 insertions(+) > >> > >> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > >> index 7ee639b..eaa0998 100644 > >> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > >> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > >> @@ -27,6 +27,11 @@ Required properties: > >> - reg: Base address and length of the register in the following order: > >> - Host controller register map (required) > >> - SD Core register map (required for msm-v4 and below) > >> + - CQE register map (Optional, needed only for eMMC and msm-v4.2 above) > > I did a quick search and it appears that SD cards implementing 6.0 of > > the spec can also use CQE. Is that correct? If so, maybe remove the > > part about "eMMC"? > On qcom platforms, only SDHC instance meant for eMMC has the CQE support. > So mentioned that its needed only for eMMC. Ah, got it. Maybe mention this in the bindings? Like "Optional, CQE is only implemented on controllers meant for eMMC and version v4.2 and above" > > Maybe also change "needed" to "useful" to make it clear that this > > entry isn't actually required for all msm-v4.2 controllers? > sure. > > > >> +- reg-names: When CQE register map is supplied, below reg-names are required > >> + - "hc_mem" for Host controller register map > >> + - "core_mem" for SD cpre regoster map > > s/regoster/register Oh, also s/cpre/core > >> + - "cqhci_mem" for CQE register map > > I'm at least slightly confused. You say that reg-names are there only > > if CQE register map is supplied. ...and that requires 4.2 and above. > > ...but "core_mem" is only there on 4.0 and below. So there should > > never be a "core_mem" entry? > core_mem is present till <v5.0 > cqhci_mem is present on >=v4.2 > Say, for version v4.2 both are present; .... and for v5.0 only cqhci_mem > is present. > > Both hc reg-map and core reg-map are being accessed through index. > So no need to list the reg names 'hc_mem' & 'core_mem' in general. > > But coming to cqhci reg-map we can't access it with fixed index, since > its index varies between 1/2 > based on controller version. > > So we are accessing it through reg-names. Since reg-names has to be > associated with corresponding > reg maps, other two reg-names (hc_mem & core_mem) also need to br listed > when cqhci_mem is listed. > > That is the reason, I mentioned it like these are needed only cqe reg > map is supplied. > If it is creating confusion, i will remove that statement. Ah. I think I got confused! When I saw "msm-v4 and below" in the description of "SD Core register map", I assumed that means that "v4.2" didn't have it. Maybe would be less confusing to change to: - SD Core register map (required for controllers earlier than msm-v5) Then I think what you have can be fine. > > Trying to specify that sanely in free-form text seems like it's gonna > > be hard and not worth it. You should probably transition to yaml > > first? > > > > > > I will also note that Rob isn't a huge fan of "reg-names". In a > > different conversation I think you mentioned you had a reason for > > having it. I guess just be prepared to defend yourself against Rob if > > you feel strongly about keeping reg-names. > Sure. Its the same reason mentioned in above comment. OK. You've convinced me. It's still up to Rob but it seems like you have a good justification now that I understand it better.. ;-) I think you could send out a v2 with the small wording changes and maybe it would be landable, but you'd want to follow up rather soon with the yaml conversion. -Doug
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt index 7ee639b..eaa0998 100644 --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt @@ -27,6 +27,11 @@ Required properties: - reg: Base address and length of the register in the following order: - Host controller register map (required) - SD Core register map (required for msm-v4 and below) + - CQE register map (Optional, needed only for eMMC and msm-v4.2 above) +- reg-names: When CQE register map is supplied, below reg-names are required + - "hc_mem" for Host controller register map + - "core_mem" for SD cpre regoster map + - "cqhci_mem" for CQE register map - interrupts: Should contain an interrupt-specifiers for the interrupts: - Host controller interrupt (required) - pinctrl-names: Should contain only one value - "default".
CQE feature has been enabled on sdhci-msm. Add CQE reg map that needs to be supplied for supporting CQE feature. Change-Id: I788c4bd5b7cbca16bc1030a410cc5550ed7204e1 Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> --- Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 5 +++++ 1 file changed, 5 insertions(+)