From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
of the R-Car Gen3, but it has some differences:
- HS400 is not supported.
- It supports the SD_IOVS bit to control the IO voltage level.
- It supports fixed address mode.

To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
compatible string is added.

A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
and voltage level switching for the SD/MMC.

Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
to indicate that an internal regulator is used instead of a
GPIO-controlled regulator. This flag will help configure the internal
regulator and avoid special handling when GPIO is used for voltage
regulation instead of the SD_(IOVS/PWEN) pins.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3
- Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
- Added regulator-compatible property for vqmmc-regulator
- Added 'renesas,sdhi-use-internal-regulator' property

v1->v2
- Moved vqmmc object in the if block
- Updated commit message
---
 .../devicetree/bindings/mmc/renesas,sdhi.yaml | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
index 3d0e61e59856..20769434a422 100644
--- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
+++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
@@ -18,6 +18,7 @@ properties:
           - renesas,sdhi-r7s9210 # SH-Mobile AG5
           - renesas,sdhi-r8a73a4 # R-Mobile APE6
           - renesas,sdhi-r8a7740 # R-Mobile A1
+          - renesas,sdhi-r9a09g057 # RZ/V2H(P)
           - renesas,sdhi-sh73a0  # R-Mobile APE6
       - items:
           - enum:
@@ -118,7 +119,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: renesas,rzg2l-sdhi
+            enum:
+              - renesas,sdhi-r9a09g057
+              - renesas,rzg2l-sdhi
     then:
       properties:
         clocks:
@@ -204,6 +207,31 @@ allOf:
         sectioned off to be run by a separate second clock source to allow
         the main core clock to be turned off to save power.
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,sdhi-r9a09g057
+    then:
+      properties:
+        renesas,sdhi-use-internal-regulator:
+          $ref: /schemas/types.yaml#/definitions/flag
+          description:
+            Flag to indicate internal regulator is being used instead of GPIO regulator.
+
+        vqmmc-regulator:
+          type: object
+          description: VQMMC SD regulator
+          $ref: /schemas/regulator/regulator.yaml#
+          unevaluatedProperties: false
+
+          properties:
+            regulator-compatible:
+              pattern: "^vqmmc-r9a09g057-regulator"
+
+      required:
+        - vqmmc-regulator
+
 required:
   - compatible
   - reg
-- 
2.34.1

Hi Prabhakar,

On Mon, Jun 24, 2024 at 5:33 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> of the R-Car Gen3, but it has some differences:
> - HS400 is not supported.
> - It supports the SD_IOVS bit to control the IO voltage level.
> - It supports fixed address mode.
>
> To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> compatible string is added.
>
> A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> and voltage level switching for the SD/MMC.
>
> Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> to indicate that an internal regulator is used instead of a
> GPIO-controlled regulator. This flag will help configure the internal
> regulator and avoid special handling when GPIO is used for voltage
> regulation instead of the SD_(IOVS/PWEN) pins.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v2->v3
> - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> - Added regulator-compatible property for vqmmc-regulator
> - Added 'renesas,sdhi-use-internal-regulator' property

Thanks for the update!

> --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> @@ -204,6 +207,31 @@ allOf:
>          sectioned off to be run by a separate second clock source to allow
>          the main core clock to be turned off to save power.
>
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,sdhi-r9a09g057
> +    then:
> +      properties:
> +        renesas,sdhi-use-internal-regulator:
> +          $ref: /schemas/types.yaml#/definitions/flag
> +          description:
> +            Flag to indicate internal regulator is being used instead of GPIO regulator.

Do you really need this?
The status of the regulator subnode already indicates this.

> +
> +        vqmmc-regulator:
> +          type: object
> +          description: VQMMC SD regulator
> +          $ref: /schemas/regulator/regulator.yaml#
> +          unevaluatedProperties: false
> +
> +          properties:
> +            regulator-compatible:
> +              pattern: "^vqmmc-r9a09g057-regulator"
> +
> +      required:
> +        - vqmmc-regulator

I'm not 100% sure this works correctly: does the checker complain if
a required subnode is disabled? Note that I haven't checked that.

> +
>  required:
>    - compatible
>    - reg

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Hi Geert,

Thank you for the review.

On Tue, Jun 25, 2024 at 7:57 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Jun 24, 2024 at 5:33 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> > of the R-Car Gen3, but it has some differences:
> > - HS400 is not supported.
> > - It supports the SD_IOVS bit to control the IO voltage level.
> > - It supports fixed address mode.
> >
> > To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> > compatible string is added.
> >
> > A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> > and voltage level switching for the SD/MMC.
> >
> > Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> > to indicate that an internal regulator is used instead of a
> > GPIO-controlled regulator. This flag will help configure the internal
> > regulator and avoid special handling when GPIO is used for voltage
> > regulation instead of the SD_(IOVS/PWEN) pins.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v2->v3
> > - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> > - Added regulator-compatible property for vqmmc-regulator
> > - Added 'renesas,sdhi-use-internal-regulator' property
>
> Thanks for the update!
>
> > --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > @@ -204,6 +207,31 @@ allOf:
> >          sectioned off to be run by a separate second clock source to allow
> >          the main core clock to be turned off to save power.
> >
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,sdhi-r9a09g057
> > +    then:
> > +      properties:
> > +        renesas,sdhi-use-internal-regulator:
> > +          $ref: /schemas/types.yaml#/definitions/flag
> > +          description:
> > +            Flag to indicate internal regulator is being used instead of GPIO regulator.
>
> Do you really need this?
For cases where the status is okay for the regulator but still the
user has phandle for the GPIO regulator or shall I drop this case?

> The status of the regulator subnode already indicates this.
You mean to use of_device_is_available() ?

>
> > +
> > +        vqmmc-regulator:
> > +          type: object
> > +          description: VQMMC SD regulator
> > +          $ref: /schemas/regulator/regulator.yaml#
> > +          unevaluatedProperties: false
> > +
> > +          properties:
> > +            regulator-compatible:
> > +              pattern: "^vqmmc-r9a09g057-regulator"
> > +
> > +      required:
> > +        - vqmmc-regulator
>
> I'm not 100% sure this works correctly: does the checker complain if
> a required subnode is disabled? Note that I haven't checked that.
>
Here is the experiment which I tried and the checker didnt complain,

&sdhi1 {
    status = "okay";
};

&vqmmc_sdhi1 {
    status = "disabled";
};

But the above is still a valid case where the user wants to use a GPIO
regulator?

Cheers,
Prabhakar

Hi Prabhakar,

On Tue, Jun 25, 2024 at 10:47 AM Lad, Prabhakar
<prabhakar.csengg@gmail.com> wrote:
> On Tue, Jun 25, 2024 at 7:57 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > On Mon, Jun 24, 2024 at 5:33 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > >
> > > The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> > > of the R-Car Gen3, but it has some differences:
> > > - HS400 is not supported.
> > > - It supports the SD_IOVS bit to control the IO voltage level.
> > > - It supports fixed address mode.
> > >
> > > To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> > > compatible string is added.
> > >
> > > A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> > > and voltage level switching for the SD/MMC.
> > >
> > > Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> > > to indicate that an internal regulator is used instead of a
> > > GPIO-controlled regulator. This flag will help configure the internal
> > > regulator and avoid special handling when GPIO is used for voltage
> > > regulation instead of the SD_(IOVS/PWEN) pins.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > > v2->v3
> > > - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> > > - Added regulator-compatible property for vqmmc-regulator
> > > - Added 'renesas,sdhi-use-internal-regulator' property
> >
> > Thanks for the update!
> >
> > > --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > @@ -204,6 +207,31 @@ allOf:
> > >          sectioned off to be run by a separate second clock source to allow
> > >          the main core clock to be turned off to save power.
> > >
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            const: renesas,sdhi-r9a09g057
> > > +    then:
> > > +      properties:
> > > +        renesas,sdhi-use-internal-regulator:
> > > +          $ref: /schemas/types.yaml#/definitions/flag
> > > +          description:
> > > +            Flag to indicate internal regulator is being used instead of GPIO regulator.
> >
> > Do you really need this?
> For cases where the status is okay for the regulator but still the
> user has phandle for the GPIO regulator or shall I drop this case?

I think that case can be ignored.
The regulator subnode would be disabled by default in the .dtsi, right?

> > The status of the regulator subnode already indicates this.
> You mean to use of_device_is_available() ?

Exactly. I.e. only register the regulator when it is enabled.

> > > +
> > > +        vqmmc-regulator:
> > > +          type: object
> > > +          description: VQMMC SD regulator
> > > +          $ref: /schemas/regulator/regulator.yaml#
> > > +          unevaluatedProperties: false
> > > +
> > > +          properties:
> > > +            regulator-compatible:
> > > +              pattern: "^vqmmc-r9a09g057-regulator"
> > > +
> > > +      required:
> > > +        - vqmmc-regulator
> >
> > I'm not 100% sure this works correctly: does the checker complain if
> > a required subnode is disabled? Note that I haven't checked that.
> >
> Here is the experiment which I tried and the checker didnt complain,
>
> &sdhi1 {
>     status = "okay";
> };
>
> &vqmmc_sdhi1 {
>     status = "disabled";
> };

OK, thanks for checking!

> But the above is still a valid case where the user wants to use a GPIO
> regulator?

Yes it is.


Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Hi Geert,

On Tue, Jun 25, 2024 at 10:02 AM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Tue, Jun 25, 2024 at 10:47 AM Lad, Prabhakar
> <prabhakar.csengg@gmail.com> wrote:
> > On Tue, Jun 25, 2024 at 7:57 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > > On Mon, Jun 24, 2024 at 5:33 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > >
> > > > The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> > > > of the R-Car Gen3, but it has some differences:
> > > > - HS400 is not supported.
> > > > - It supports the SD_IOVS bit to control the IO voltage level.
> > > > - It supports fixed address mode.
> > > >
> > > > To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> > > > compatible string is added.
> > > >
> > > > A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> > > > and voltage level switching for the SD/MMC.
> > > >
> > > > Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> > > > to indicate that an internal regulator is used instead of a
> > > > GPIO-controlled regulator. This flag will help configure the internal
> > > > regulator and avoid special handling when GPIO is used for voltage
> > > > regulation instead of the SD_(IOVS/PWEN) pins.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > ---
> > > > v2->v3
> > > > - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> > > > - Added regulator-compatible property for vqmmc-regulator
> > > > - Added 'renesas,sdhi-use-internal-regulator' property
> > >
> > > Thanks for the update!
> > >
> > > > --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > > +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > > @@ -204,6 +207,31 @@ allOf:
> > > >          sectioned off to be run by a separate second clock source to allow
> > > >          the main core clock to be turned off to save power.
> > > >
> > > > +  - if:
> > > > +      properties:
> > > > +        compatible:
> > > > +          contains:
> > > > +            const: renesas,sdhi-r9a09g057
> > > > +    then:
> > > > +      properties:
> > > > +        renesas,sdhi-use-internal-regulator:
> > > > +          $ref: /schemas/types.yaml#/definitions/flag
> > > > +          description:
> > > > +            Flag to indicate internal regulator is being used instead of GPIO regulator.
> > >
> > > Do you really need this?
> > For cases where the status is okay for the regulator but still the
> > user has phandle for the GPIO regulator or shall I drop this case?
>
> I think that case can be ignored.
> The regulator subnode would be disabled by default in the .dtsi, right?
>
Yes, agreed.

> > > The status of the regulator subnode already indicates this.
> > You mean to use of_device_is_available() ?
>
> Exactly. I.e. only register the regulator when it is enabled.
>
Okay I'll use of_device_is_available() and drop the
'renesas,sdhi-use-internal-regulator' property.

Cheers,
Prabhakar

On Mon, Jun 24, 2024 at 04:32:27PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> of the R-Car Gen3, but it has some differences:
> - HS400 is not supported.
> - It supports the SD_IOVS bit to control the IO voltage level.
> - It supports fixed address mode.
> 
> To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> compatible string is added.
> 
> A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> and voltage level switching for the SD/MMC.
> 
> Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> to indicate that an internal regulator is used instead of a
> GPIO-controlled regulator. This flag will help configure the internal
> regulator and avoid special handling when GPIO is used for voltage
> regulation instead of the SD_(IOVS/PWEN) pins.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v2->v3
> - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> - Added regulator-compatible property for vqmmc-regulator
> - Added 'renesas,sdhi-use-internal-regulator' property
> 
> v1->v2
> - Moved vqmmc object in the if block
> - Updated commit message
> ---
>  .../devicetree/bindings/mmc/renesas,sdhi.yaml | 30 ++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> index 3d0e61e59856..20769434a422 100644
> --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> @@ -18,6 +18,7 @@ properties:
>            - renesas,sdhi-r7s9210 # SH-Mobile AG5
>            - renesas,sdhi-r8a73a4 # R-Mobile APE6
>            - renesas,sdhi-r8a7740 # R-Mobile A1
> +          - renesas,sdhi-r9a09g057 # RZ/V2H(P)
>            - renesas,sdhi-sh73a0  # R-Mobile APE6
>        - items:
>            - enum:
> @@ -118,7 +119,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: renesas,rzg2l-sdhi
> +            enum:
> +              - renesas,sdhi-r9a09g057
> +              - renesas,rzg2l-sdhi
>      then:
>        properties:
>          clocks:
> @@ -204,6 +207,31 @@ allOf:
>          sectioned off to be run by a separate second clock source to allow
>          the main core clock to be turned off to save power.
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,sdhi-r9a09g057
> +    then:
> +      properties:

Please define properties at the top level and constrain then per
compatible.

Thanks,
Conor.

> +        renesas,sdhi-use-internal-regulator:
> +          $ref: /schemas/types.yaml#/definitions/flag
> +          description:
> +            Flag to indicate internal regulator is being used instead of GPIO regulator.
> +
> +        vqmmc-regulator:
> +          type: object
> +          description: VQMMC SD regulator
> +          $ref: /schemas/regulator/regulator.yaml#
> +          unevaluatedProperties: false
> +
> +          properties:
> +            regulator-compatible:
> +              pattern: "^vqmmc-r9a09g057-regulator"
> +
> +      required:
> +        - vqmmc-regulator
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.34.1
> 

Hi Conor,

Thank you for the review.

On Mon, Jun 24, 2024 at 5:39 PM Conor Dooley <conor@kernel.org> wrote:
>
> On Mon, Jun 24, 2024 at 04:32:27PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> > of the R-Car Gen3, but it has some differences:
> > - HS400 is not supported.
> > - It supports the SD_IOVS bit to control the IO voltage level.
> > - It supports fixed address mode.
> >
> > To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> > compatible string is added.
> >
> > A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> > and voltage level switching for the SD/MMC.
> >
> > Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> > to indicate that an internal regulator is used instead of a
> > GPIO-controlled regulator. This flag will help configure the internal
> > regulator and avoid special handling when GPIO is used for voltage
> > regulation instead of the SD_(IOVS/PWEN) pins.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v2->v3
> > - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> > - Added regulator-compatible property for vqmmc-regulator
> > - Added 'renesas,sdhi-use-internal-regulator' property
> >
> > v1->v2
> > - Moved vqmmc object in the if block
> > - Updated commit message
> > ---
> >  .../devicetree/bindings/mmc/renesas,sdhi.yaml | 30 ++++++++++++++++++-
> >  1 file changed, 29 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > index 3d0e61e59856..20769434a422 100644
> > --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > @@ -18,6 +18,7 @@ properties:
> >            - renesas,sdhi-r7s9210 # SH-Mobile AG5
> >            - renesas,sdhi-r8a73a4 # R-Mobile APE6
> >            - renesas,sdhi-r8a7740 # R-Mobile A1
> > +          - renesas,sdhi-r9a09g057 # RZ/V2H(P)
> >            - renesas,sdhi-sh73a0  # R-Mobile APE6
> >        - items:
> >            - enum:
> > @@ -118,7 +119,9 @@ allOf:
> >        properties:
> >          compatible:
> >            contains:
> > -            const: renesas,rzg2l-sdhi
> > +            enum:
> > +              - renesas,sdhi-r9a09g057
> > +              - renesas,rzg2l-sdhi
> >      then:
> >        properties:
> >          clocks:
> > @@ -204,6 +207,31 @@ allOf:
> >          sectioned off to be run by a separate second clock source to allow
> >          the main core clock to be turned off to save power.
> >
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,sdhi-r9a09g057
> > +    then:
> > +      properties:
>
> Please define properties at the top level and constrain then per
> compatible.
>
Ok, I'll move them to the top level.

Cheers,
Prabhakar