[PATCH] ram: rockchip: px30: add a config-based ddr selection

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Heiko Stuebner]

From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

The SRAM on the PX30 is not big enough to hold multiple DDR configs
so it needs to be selected during build.

So far simply the DDR3 config was always selected and getting DDR4
or LPDDR2/3 initialized would require a code modification.

So add Kconfig options similar to RK3399 to allow selecting the DDR4
and LPDDR2/3 options instead, while DDR3 stays the default as before.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
---
 drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
 drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
index 8e97c2f49e..c459bbf5e2 100644
--- a/drivers/ram/rockchip/Kconfig
+++ b/drivers/ram/rockchip/Kconfig
@@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
 	  This is an option for developers to understand the ram drivers
 	  initialization, configurations and etc.
 
+config RAM_PX30_DDR4
+	bool "DDR3 support for Rockchip PX30"
+	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
+	help
+	  This enables DDR4 sdram support instead of the default DDR3 support
+	  on Rockchip PC30 SoCs.
+
+config RAM_PX30_LPDDR2
+	bool "LPDDR2 support for Rockchip PX30"
+	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
+	help
+	  This enables LPDDR2 sdram support instead of the default DDR3 support
+	  on Rockchip PC30 SoCs.
+
+config RAM_PX30_LPDDR3
+	bool "LPDDR3 support for Rockchip PX30"
+	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
+	help
+	  This enables LPDDR3 sdram support instead of the default DDR3 support
+	  on Rockchip PC30 SoCs.
+
 config RAM_RK3399_LPDDR4
 	bool "LPDDR4 support for Rockchip RK3399"
 	depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
index fd5763d0a0..2f1f6e9c0c 100644
--- a/drivers/ram/rockchip/sdram_px30.c
+++ b/drivers/ram/rockchip/sdram_px30.c
@@ -125,7 +125,15 @@ u32 addrmap[][8] = {
 struct dram_info dram_info;
 
 struct px30_sdram_params sdram_configs[] = {
+#if defined(CONFIG_RAM_PX30_DDR4)
+#include	"sdram-px30-ddr4-detect-333.inc"
+#elif defined(CONFIG_RAM_PX30_LPDDR2)
+#include	"sdram-px30-lpddr2-detect-333.inc"
+#elif defined(CONFIG_RAM_PX30_LPDDR3)
+#include	"sdram-px30-lpddr3-detect-333.inc"
+#else
 #include	"sdram-px30-ddr3-detect-333.inc"
+#endif
 };
 
 struct ddr_phy_skew skew = {
-- 
2.28.0

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Simon Glass]

Hi Heiko,

On Thu, 1 Oct 2020 at 12:40, Heiko Stuebner <heiko@sntech.de> wrote:
>
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
>
> The SRAM on the PX30 is not big enough to hold multiple DDR configs
> so it needs to be selected during build.
>
> So far simply the DDR3 config was always selected and getting DDR4
> or LPDDR2/3 initialized would require a code modification.
>
> So add Kconfig options similar to RK3399 to allow selecting the DDR4
> and LPDDR2/3 options instead, while DDR3 stays the default as before.
>
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> ---
>  drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
>  drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
>  2 files changed, 29 insertions(+)
>
> diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
> index 8e97c2f49e..c459bbf5e2 100644
> --- a/drivers/ram/rockchip/Kconfig
> +++ b/drivers/ram/rockchip/Kconfig
> @@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
>           This is an option for developers to understand the ram drivers
>           initialization, configurations and etc.
>
> +config RAM_PX30_DDR4
> +       bool "DDR3 support for Rockchip PX30"
> +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +       help
> +         This enables DDR4 sdram support instead of the default DDR3 support
> +         on Rockchip PC30 SoCs.
> +
> +config RAM_PX30_LPDDR2
> +       bool "LPDDR2 support for Rockchip PX30"
> +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +       help
> +         This enables LPDDR2 sdram support instead of the default DDR3 support
> +         on Rockchip PC30 SoCs.
> +
> +config RAM_PX30_LPDDR3
> +       bool "LPDDR3 support for Rockchip PX30"
> +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +       help
> +         This enables LPDDR3 sdram support instead of the default DDR3 support
> +         on Rockchip PC30 SoCs.
> +
>  config RAM_RK3399_LPDDR4
>         bool "LPDDR4 support for Rockchip RK3399"
>         depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
> diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
> index fd5763d0a0..2f1f6e9c0c 100644
> --- a/drivers/ram/rockchip/sdram_px30.c
> +++ b/drivers/ram/rockchip/sdram_px30.c
> @@ -125,7 +125,15 @@ u32 addrmap[][8] = {
>  struct dram_info dram_info;
>
>  struct px30_sdram_params sdram_configs[] = {
> +#if defined(CONFIG_RAM_PX30_DDR4)
> +#include       "sdram-px30-ddr4-detect-333.inc"
> +#elif defined(CONFIG_RAM_PX30_LPDDR2)
> +#include       "sdram-px30-lpddr2-detect-333.inc"
> +#elif defined(CONFIG_RAM_PX30_LPDDR3)
> +#include       "sdram-px30-lpddr3-detect-333.inc"
> +#else
>  #include       "sdram-px30-ddr3-detect-333.inc"
> +#endif

How about putting this in the device tree? I think that would be a better place.

Regards,
Simon



>  };
>
>  struct ddr_phy_skew skew = {
> --
> 2.28.0
>

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Heiko Stübner]

Hi Simon,

Am Freitag, 2. Oktober 2020, 04:09:56 CEST schrieb Simon Glass:
> Hi Heiko,
> 
> On Thu, 1 Oct 2020 at 12:40, Heiko Stuebner <heiko@sntech.de> wrote:
> >
> > From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> >
> > The SRAM on the PX30 is not big enough to hold multiple DDR configs
> > so it needs to be selected during build.
> >
> > So far simply the DDR3 config was always selected and getting DDR4
> > or LPDDR2/3 initialized would require a code modification.
> >
> > So add Kconfig options similar to RK3399 to allow selecting the DDR4
> > and LPDDR2/3 options instead, while DDR3 stays the default as before.
> >
> > Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> > ---
> >  drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
> >  drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
> >  2 files changed, 29 insertions(+)
> >
> > diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
> > index 8e97c2f49e..c459bbf5e2 100644
> > --- a/drivers/ram/rockchip/Kconfig
> > +++ b/drivers/ram/rockchip/Kconfig
> > @@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
> >           This is an option for developers to understand the ram drivers
> >           initialization, configurations and etc.
> >
> > +config RAM_PX30_DDR4
> > +       bool "DDR3 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables DDR4 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> > +config RAM_PX30_LPDDR2
> > +       bool "LPDDR2 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables LPDDR2 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> > +config RAM_PX30_LPDDR3
> > +       bool "LPDDR3 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables LPDDR3 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> >  config RAM_RK3399_LPDDR4
> >         bool "LPDDR4 support for Rockchip RK3399"
> >         depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
> > diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
> > index fd5763d0a0..2f1f6e9c0c 100644
> > --- a/drivers/ram/rockchip/sdram_px30.c
> > +++ b/drivers/ram/rockchip/sdram_px30.c
> > @@ -125,7 +125,15 @@ u32 addrmap[][8] = {
> >  struct dram_info dram_info;
> >
> >  struct px30_sdram_params sdram_configs[] = {
> > +#if defined(CONFIG_RAM_PX30_DDR4)
> > +#include       "sdram-px30-ddr4-detect-333.inc"
> > +#elif defined(CONFIG_RAM_PX30_LPDDR2)
> > +#include       "sdram-px30-lpddr2-detect-333.inc"
> > +#elif defined(CONFIG_RAM_PX30_LPDDR3)
> > +#include       "sdram-px30-lpddr3-detect-333.inc"
> > +#else
> >  #include       "sdram-px30-ddr3-detect-333.inc"
> > +#endif
> 
> How about putting this in the device tree? I think that would be a better place.

On the PX30 the TPL does the ram initialization and the SRAM it runs in
is very limited, so the PX30-TPL doesn't even have devicetree support
available - hence the ram selection needs to selected at compiletime.

Even right now we're "dancing" very narrowly on the limit ;-)

Heiko

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Heiko Stübner]

Hi Simon,

Am Freitag, 2. Oktober 2020, 07:58:35 CEST schrieb Heiko St?bner:
> Am Freitag, 2. Oktober 2020, 04:09:56 CEST schrieb Simon Glass:
> > On Thu, 1 Oct 2020 at 12:40, Heiko Stuebner <heiko@sntech.de> wrote:
> > >
> > > From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> > >
> > > The SRAM on the PX30 is not big enough to hold multiple DDR configs
> > > so it needs to be selected during build.
> > >
> > > So far simply the DDR3 config was always selected and getting DDR4
> > > or LPDDR2/3 initialized would require a code modification.
> > >
> > > So add Kconfig options similar to RK3399 to allow selecting the DDR4
> > > and LPDDR2/3 options instead, while DDR3 stays the default as before.
> > >
> > > Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> > > ---
> > >  drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
> > >  drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
> > >  2 files changed, 29 insertions(+)
> > >
> > > diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
> > > index 8e97c2f49e..c459bbf5e2 100644
> > > --- a/drivers/ram/rockchip/Kconfig
> > > +++ b/drivers/ram/rockchip/Kconfig
> > > @@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
> > >           This is an option for developers to understand the ram drivers
> > >           initialization, configurations and etc.
> > >
> > > +config RAM_PX30_DDR4
> > > +       bool "DDR3 support for Rockchip PX30"
> > > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > > +       help
> > > +         This enables DDR4 sdram support instead of the default DDR3 support
> > > +         on Rockchip PC30 SoCs.
> > > +
> > > +config RAM_PX30_LPDDR2
> > > +       bool "LPDDR2 support for Rockchip PX30"
> > > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > > +       help
> > > +         This enables LPDDR2 sdram support instead of the default DDR3 support
> > > +         on Rockchip PC30 SoCs.
> > > +
> > > +config RAM_PX30_LPDDR3
> > > +       bool "LPDDR3 support for Rockchip PX30"
> > > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > > +       help
> > > +         This enables LPDDR3 sdram support instead of the default DDR3 support
> > > +         on Rockchip PC30 SoCs.
> > > +
> > >  config RAM_RK3399_LPDDR4
> > >         bool "LPDDR4 support for Rockchip RK3399"
> > >         depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
> > > diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
> > > index fd5763d0a0..2f1f6e9c0c 100644
> > > --- a/drivers/ram/rockchip/sdram_px30.c
> > > +++ b/drivers/ram/rockchip/sdram_px30.c
> > > @@ -125,7 +125,15 @@ u32 addrmap[][8] = {
> > >  struct dram_info dram_info;
> > >
> > >  struct px30_sdram_params sdram_configs[] = {
> > > +#if defined(CONFIG_RAM_PX30_DDR4)
> > > +#include       "sdram-px30-ddr4-detect-333.inc"
> > > +#elif defined(CONFIG_RAM_PX30_LPDDR2)
> > > +#include       "sdram-px30-lpddr2-detect-333.inc"
> > > +#elif defined(CONFIG_RAM_PX30_LPDDR3)
> > > +#include       "sdram-px30-lpddr3-detect-333.inc"
> > > +#else
> > >  #include       "sdram-px30-ddr3-detect-333.inc"
> > > +#endif
> > 
> > How about putting this in the device tree? I think that would be a better place.
> 
> On the PX30 the TPL does the ram initialization and the SRAM it runs in
> is very limited, so the PX30-TPL doesn't even have devicetree support
> available - hence the ram selection needs to selected at compiletime.
> 
> Even right now we're "dancing" very narrowly on the limit ;-)

Just to provide some more detail, in the PX30-TPL there is neither
devicetree nor driver model support and of the 10240bytes of
available sram, the current TPL binary already uses 10184 bytes.

So right now we have a whopping 56 bytes still available, which doesn't
leave wiggleroom at all and I actually need to hope that uboot stays
on its diet ;-) .


Heiko

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Jagan Teki]

On Fri, Oct 2, 2020 at 7:40 AM Simon Glass <sjg@chromium.org> wrote:
>
> Hi Heiko,
>
> On Thu, 1 Oct 2020 at 12:40, Heiko Stuebner <heiko@sntech.de> wrote:
> >
> > From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> >
> > The SRAM on the PX30 is not big enough to hold multiple DDR configs
> > so it needs to be selected during build.
> >
> > So far simply the DDR3 config was always selected and getting DDR4
> > or LPDDR2/3 initialized would require a code modification.
> >
> > So add Kconfig options similar to RK3399 to allow selecting the DDR4
> > and LPDDR2/3 options instead, while DDR3 stays the default as before.
> >
> > Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> > ---
> >  drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
> >  drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
> >  2 files changed, 29 insertions(+)
> >
> > diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
> > index 8e97c2f49e..c459bbf5e2 100644
> > --- a/drivers/ram/rockchip/Kconfig
> > +++ b/drivers/ram/rockchip/Kconfig
> > @@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
> >           This is an option for developers to understand the ram drivers
> >           initialization, configurations and etc.
> >
> > +config RAM_PX30_DDR4
> > +       bool "DDR3 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables DDR4 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> > +config RAM_PX30_LPDDR2
> > +       bool "LPDDR2 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables LPDDR2 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> > +config RAM_PX30_LPDDR3
> > +       bool "LPDDR3 support for Rockchip PX30"
> > +       depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> > +       help
> > +         This enables LPDDR3 sdram support instead of the default DDR3 support
> > +         on Rockchip PC30 SoCs.
> > +
> >  config RAM_RK3399_LPDDR4
> >         bool "LPDDR4 support for Rockchip RK3399"
> >         depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
> > diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
> > index fd5763d0a0..2f1f6e9c0c 100644
> > --- a/drivers/ram/rockchip/sdram_px30.c
> > +++ b/drivers/ram/rockchip/sdram_px30.c
> > @@ -125,7 +125,15 @@ u32 addrmap[][8] = {
> >  struct dram_info dram_info;
> >
> >  struct px30_sdram_params sdram_configs[] = {
> > +#if defined(CONFIG_RAM_PX30_DDR4)
> > +#include       "sdram-px30-ddr4-detect-333.inc"
> > +#elif defined(CONFIG_RAM_PX30_LPDDR2)
> > +#include       "sdram-px30-lpddr2-detect-333.inc"
> > +#elif defined(CONFIG_RAM_PX30_LPDDR3)
> > +#include       "sdram-px30-lpddr3-detect-333.inc"
> > +#else
> >  #include       "sdram-px30-ddr3-detect-333.inc"
> > +#endif
>
> How about putting this in the device tree? I think that would be a better place.

I did try this while support Engicam PX30.Core. Seems impossible to
drive with the timings via device tree.

With PLATDATA and disabled unused drivers in TPL, I still way behind
0x3000 bytes.

  MKIMAGE u-boot.itb
  MKIMAGE tpl/u-boot-tpl-rockchip.bin
Error: SPL image is too large (size 0x5800 than 0x2800)
Error: Bad parameters for image type

Jagan.

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Jagan Teki]

On Fri, Oct 2, 2020 at 12:10 AM Heiko Stuebner <heiko@sntech.de> wrote:
>
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
>
> The SRAM on the PX30 is not big enough to hold multiple DDR configs
> so it needs to be selected during build.
>
> So far simply the DDR3 config was always selected and getting DDR4
> or LPDDR2/3 initialized would require a code modification.
>
> So add Kconfig options similar to RK3399 to allow selecting the DDR4
> and LPDDR2/3 options instead, while DDR3 stays the default as before.
>
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> ---

Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Kever Yang]

On 2020/10/2 ??2:40, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
>
> The SRAM on the PX30 is not big enough to hold multiple DDR configs
> so it needs to be selected during build.
>
> So far simply the DDR3 config was always selected and getting DDR4
> or LPDDR2/3 initialized would require a code modification.
>
> So add Kconfig options similar to RK3399 to allow selecting the DDR4
> and LPDDR2/3 options instead, while DDR3 stays the default as before.
>
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>

Thanks,
- Kever
> ---
>   drivers/ram/rockchip/Kconfig      | 21 +++++++++++++++++++++
>   drivers/ram/rockchip/sdram_px30.c |  8 ++++++++
>   2 files changed, 29 insertions(+)
>
> diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
> index 8e97c2f49e..c459bbf5e2 100644
> --- a/drivers/ram/rockchip/Kconfig
> +++ b/drivers/ram/rockchip/Kconfig
> @@ -22,6 +22,27 @@ config RAM_ROCKCHIP_DEBUG
>   	  This is an option for developers to understand the ram drivers
>   	  initialization, configurations and etc.
>   
> +config RAM_PX30_DDR4
> +	bool "DDR3 support for Rockchip PX30"
> +	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +	help
> +	  This enables DDR4 sdram support instead of the default DDR3 support
> +	  on Rockchip PC30 SoCs.
> +
> +config RAM_PX30_LPDDR2
> +	bool "LPDDR2 support for Rockchip PX30"
> +	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +	help
> +	  This enables LPDDR2 sdram support instead of the default DDR3 support
> +	  on Rockchip PC30 SoCs.
> +
> +config RAM_PX30_LPDDR3
> +	bool "LPDDR3 support for Rockchip PX30"
> +	depends on RAM_ROCKCHIP && ROCKCHIP_PX30
> +	help
> +	  This enables LPDDR3 sdram support instead of the default DDR3 support
> +	  on Rockchip PC30 SoCs.
> +
>   config RAM_RK3399_LPDDR4
>   	bool "LPDDR4 support for Rockchip RK3399"
>   	depends on RAM_ROCKCHIP && ROCKCHIP_RK3399
> diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
> index fd5763d0a0..2f1f6e9c0c 100644
> --- a/drivers/ram/rockchip/sdram_px30.c
> +++ b/drivers/ram/rockchip/sdram_px30.c
> @@ -125,7 +125,15 @@ u32 addrmap[][8] = {
>   struct dram_info dram_info;
>   
>   struct px30_sdram_params sdram_configs[] = {
> +#if defined(CONFIG_RAM_PX30_DDR4)
> +#include	"sdram-px30-ddr4-detect-333.inc"
> +#elif defined(CONFIG_RAM_PX30_LPDDR2)
> +#include	"sdram-px30-lpddr2-detect-333.inc"
> +#elif defined(CONFIG_RAM_PX30_LPDDR3)
> +#include	"sdram-px30-lpddr3-detect-333.inc"
> +#else
>   #include	"sdram-px30-ddr3-detect-333.inc"
> +#endif
>   };
>   
>   struct ddr_phy_skew skew = {

[PATCH] ram: rockchip: px30: add a config-based ddr selection

[Philipp Tomsich]

> On 01.10.2020, at 20:40, Heiko Stuebner <heiko@sntech.de> wrote:
> 
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> 
> The SRAM on the PX30 is not big enough to hold multiple DDR configs
> so it needs to be selected during build.
> 
> So far simply the DDR3 config was always selected and getting DDR4
> or LPDDR2/3 initialized would require a code modification.
> 
> So add Kconfig options similar to RK3399 to allow selecting the DDR4
> and LPDDR2/3 options instead, while DDR3 stays the default as before.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>