[PATCH 0/4] Further code removal after Arnd's latest cleanup

[PATCH 0/4] Further code removal after Arnd's latest cleanup

[Lukas Bulwahn]

Dear Arnd,

you have shared some further clean-up activities in linux-next (see the
specific commits mentioned in the patches for details). This allows us to
clean up even more code in the repository.

Please pick these patches on top of the commits mentioned in the
corresponding patches (I assume that it is your soc-next tree?).


Best regards,

Lukas

Lukas Bulwahn (4):
  ARM: s3c: remove obsolete s3c-cpu-freq header
  ARM: pxa: remove further dead code after pxa93 support removal
  usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2
    chips
  ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed
    configs

 arch/arm/Kconfig.debug                   |    3 +-
 arch/arm/mach-omap1/board-osk.c          |    5 -
 arch/arm/mach-omap1/omap-dma.c           |  455 ----
 arch/arm/mach-omap1/usb.c                |   67 -
 arch/arm/mach-omap1/usb.h                |    4 -
 drivers/usb/gadget/udc/Kconfig           |   15 -
 drivers/usb/gadget/udc/Makefile          |    1 -
 drivers/usb/gadget/udc/omap_udc.c        | 3001 ----------------------
 drivers/usb/gadget/udc/omap_udc.h        |  207 --
 drivers/usb/host/Kconfig                 |    8 -
 drivers/usb/host/Makefile                |    1 -
 drivers/usb/host/ohci-omap.c             |  435 ----
 include/linux/omap-dma.h                 |   28 -
 include/linux/soc/pxa/cpu.h              |   47 -
 include/linux/soc/samsung/s3c-cpu-freq.h |  145 --
 15 files changed, 1 insertion(+), 4421 deletions(-)
 delete mode 100644 drivers/usb/gadget/udc/omap_udc.c
 delete mode 100644 drivers/usb/gadget/udc/omap_udc.h
 delete mode 100644 drivers/usb/host/ohci-omap.c
 delete mode 100644 include/linux/soc/samsung/s3c-cpu-freq.h

-- 
2.17.1


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[PATCH 1/4] ARM: s3c: remove obsolete s3c-cpu-freq header

[Lukas Bulwahn]

The s3c-cpu-freq header was previously included by:

  ./arch/arm/mach-s3c/mach-bast.c
  ./arch/arm/mach-s3c/mach-osiris-dvs.c
  ./arch/arm/mach-s3c/mach-osiris.c
  ./include/linux/soc/samsung/s3c-cpufreq-core.h

Commit a4946a153cb9 ("ARM: s3c: remove all s3c24xx support") removes the
files in ./arch/arm/mach-s3c/; commit daf0ee583fc7 ("cpufreq: remove
s3c24xx drivers") removes the file s3c-cpufreq-core.h.

Remove this obsolete header file.

This issue was identified, as s3c-cpu-freq.h referred to the removed config
ARM_S3C_CPUFREQ.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
 include/linux/soc/samsung/s3c-cpu-freq.h | 145 -----------------------
 1 file changed, 145 deletions(-)
 delete mode 100644 include/linux/soc/samsung/s3c-cpu-freq.h

diff --git a/include/linux/soc/samsung/s3c-cpu-freq.h b/include/linux/soc/samsung/s3c-cpu-freq.h
deleted file mode 100644
index 63e88fd5dea2..000000000000
--- a/include/linux/soc/samsung/s3c-cpu-freq.h
+++ /dev/null
@@ -1,145 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (c) 2006-2007 Simtec Electronics
- *	http://armlinux.simtec.co.uk/
- *	Ben Dooks <ben@simtec.co.uk>
- *
- * S3C CPU frequency scaling support - driver and board
- */
-#ifndef __LINUX_SOC_SAMSUNG_S3C_CPU_FREQ_H
-#define __LINUX_SOC_SAMSUNG_S3C_CPU_FREQ_H
-
-#include <linux/cpufreq.h>
-
-struct s3c_cpufreq_info;
-struct s3c_cpufreq_board;
-struct s3c_iotimings;
-
-/**
- * struct s3c_freq - frequency information (mainly for core drivers)
- * @fclk: The FCLK frequency in Hz.
- * @armclk: The ARMCLK frequency in Hz.
- * @hclk_tns: HCLK cycle time in 10ths of nano-seconds.
- * @hclk: The HCLK frequency in Hz.
- * @pclk: The PCLK frequency in Hz.
- *
- * This contains the frequency information about the current configuration
- * mainly for the core drivers to ensure we do not end up passing about
- * a large number of parameters.
- *
- * The @hclk_tns field is a useful cache for the parts of the drivers that
- * need to calculate IO timings and suchlike.
- */
-struct s3c_freq {
-	unsigned long	fclk;
-	unsigned long	armclk;
-	unsigned long	hclk_tns;	/* in 10ths of ns */
-	unsigned long	hclk;
-	unsigned long	pclk;
-};
-
-/**
- * struct s3c_cpufreq_freqs - s3c cpufreq notification information.
- * @freqs: The cpufreq setting information.
- * @old: The old clock settings.
- * @new: The new clock settings.
- * @pll_changing: Set if the PLL is changing.
- *
- * Wrapper 'struct cpufreq_freqs' so that any drivers receiving the
- * notification can use this information that is not provided by just
- * having the core frequency alone.
- *
- * The pll_changing flag is used to indicate if the PLL itself is
- * being set during this change. This is important as the clocks
- * will temporarily be set to the XTAL clock during this time, so
- * drivers may want to close down their output during this time.
- *
- * Note, this is not being used by any current drivers and therefore
- * may be removed in the future.
- */
-struct s3c_cpufreq_freqs {
-	struct cpufreq_freqs	freqs;
-	struct s3c_freq		old;
-	struct s3c_freq		new;
-
-	unsigned int		pll_changing:1;
-};
-
-#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
-
-/**
- * struct s3c_clkdivs - clock divisor information
- * @p_divisor: Divisor from FCLK to PCLK.
- * @h_divisor: Divisor from FCLK to HCLK.
- * @arm_divisor: Divisor from FCLK to ARMCLK (not all CPUs).
- * @dvs: Non-zero if using DVS mode for ARMCLK.
- *
- * Divisor settings for the core clocks.
- */
-struct s3c_clkdivs {
-	int		p_divisor;
-	int		h_divisor;
-	int		arm_divisor;
-	unsigned char	dvs;
-};
-
-#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
-
-/**
- * struct s3c_pllval - PLL value entry.
- * @freq: The frequency for this entry in Hz.
- * @pll_reg: The PLL register setting for this PLL value.
- */
-struct s3c_pllval {
-	unsigned long		freq;
-	unsigned long		pll_reg;
-};
-
-/**
- * struct s3c_cpufreq_board - per-board cpu frequency informatin
- * @refresh: The SDRAM refresh period in nanoseconds.
- * @auto_io: Set if the IO timing settings should be generated from the
- *	initialisation time hardware registers.
- * @need_io: Set if the board has external IO on any of the chipselect
- *	lines that will require the hardware timing registers to be
- *	updated on a clock change.
- * @max: The maxium frequency limits for the system. Any field that
- *	is left at zero will use the CPU's settings.
- *
- * This contains the board specific settings that affect how the CPU
- * drivers chose settings. These include the memory refresh and IO
- * timing information.
- *
- * Registration depends on the driver being used, the ARMCLK only
- * implementation does not currently need this but the older style
- * driver requires this to be available.
- */
-struct s3c_cpufreq_board {
-	unsigned int	refresh;
-	unsigned int	auto_io:1;	/* automatically init io timings. */
-	unsigned int	need_io:1;	/* set if needs io timing support. */
-
-	/* any non-zero field in here is taken as an upper limit. */
-	struct s3c_freq	max;	/* frequency limits */
-};
-
-/* Things depending on frequency scaling. */
-#ifdef CONFIG_ARM_S3C_CPUFREQ
-#define __init_or_cpufreq
-#else
-#define __init_or_cpufreq __init
-#endif
-
-/* Board functions */
-
-#ifdef CONFIG_ARM_S3C_CPUFREQ
-extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board);
-#else
-
-static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board)
-{
-	return 0;
-}
-#endif  /* CONFIG_ARM_S3C_CPUFREQ */
-
-#endif
-- 
2.17.1


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[PATCH 2/4] ARM: pxa: remove further dead code after pxa93 support removal

[Lukas Bulwahn]

Commit 150ccb6f9a89 ("ARM: pxa: remove pxa93x support") removes configs
CPU_PXA930 and CPU_PXA935 and uses of cpu_is_pxa93x() and cpu_is_pxa935().

Remove some further dead code in ./include/linux/soc/pxa/cpu.h on top of
that commit above.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
 include/linux/soc/pxa/cpu.h | 47 -------------------------------------
 1 file changed, 47 deletions(-)

diff --git a/include/linux/soc/pxa/cpu.h b/include/linux/soc/pxa/cpu.h
index 5782450ee45c..c151a9a14cce 100644
--- a/include/linux/soc/pxa/cpu.h
+++ b/include/linux/soc/pxa/cpu.h
@@ -126,26 +126,6 @@
 #define __cpu_is_pxa320(id)	(0)
 #endif
 
-#ifdef CONFIG_CPU_PXA930
-#define __cpu_is_pxa930(id)				\
-	({						\
-		unsigned int _id = (id) >> 4 & 0xfff;	\
-		_id == 0x683;				\
-	 })
-#else
-#define __cpu_is_pxa930(id)	(0)
-#endif
-
-#ifdef CONFIG_CPU_PXA935
-#define __cpu_is_pxa935(id)				\
-	({						\
-		unsigned int _id = (id) >> 4 & 0xfff;	\
-		_id == 0x693;				\
-	 })
-#else
-#define __cpu_is_pxa935(id)	(0)
-#endif
-
 #define cpu_is_pxa210()					\
 	({						\
 		__cpu_is_pxa210(read_cpuid_id());	\
@@ -186,18 +166,6 @@
 		__cpu_is_pxa320(read_cpuid_id());	\
 	 })
 
-#define cpu_is_pxa930()					\
-	({						\
-		__cpu_is_pxa930(read_cpuid_id());	\
-	 })
-
-#define cpu_is_pxa935()					\
-	({						\
-		__cpu_is_pxa935(read_cpuid_id());	\
-	 })
-
-
-
 /*
  * CPUID Core Generation Bit
  * <= 0x2 for pxa21x/pxa25x/pxa26x/pxa27x
@@ -224,16 +192,6 @@
 #define __cpu_is_pxa3xx(id)	(0)
 #endif
 
-#if defined(CONFIG_CPU_PXA930) || defined(CONFIG_CPU_PXA935)
-#define __cpu_is_pxa93x(id)				\
-	({						\
-		__cpu_is_pxa930(id)			\
-			|| __cpu_is_pxa935(id);		\
-	 })
-#else
-#define __cpu_is_pxa93x(id)	(0)
-#endif
-
 #define cpu_is_pxa2xx()					\
 	({						\
 		__cpu_is_pxa2xx(read_cpuid_id());	\
@@ -244,9 +202,4 @@
 		__cpu_is_pxa3xx(read_cpuid_id());	\
 	 })
 
-#define cpu_is_pxa93x()					\
-	({						\
-		__cpu_is_pxa93x(read_cpuid_id());	\
-	 })
-
 #endif
-- 
2.17.1


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[PATCH 4/4] ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed configs

[Lukas Bulwahn]

Commit 67d3928c3df5 ("ARM: omap1: remove unused board files") removes
configs DEBUG_OMAP7XXUART{1,2,3}.

The config DEBUG_UART_8250_SHIFT still refers to those removed configs.

Remove those obsolete references.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
 arch/arm/Kconfig.debug | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index d0c1e4410694..8e49a44ec532 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1778,8 +1778,7 @@ config DEBUG_UART_8250_SHIFT
 	int "Register offset shift for the 8250 debug UART"
 	depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
 	default 0 if DEBUG_FOOTBRIDGE_COM1 || DEBUG_BCM_5301X || \
-		DEBUG_BCM_HR2 || DEBUG_OMAP7XXUART1 || DEBUG_OMAP7XXUART2 || \
-		DEBUG_OMAP7XXUART3
+		DEBUG_BCM_HR2
 	default 3 if DEBUG_MSTARV7_PMUART
 	default 2
 
-- 
2.17.1


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Re: [PATCH 1/4] ARM: s3c: remove obsolete s3c-cpu-freq header

[Krzysztof Kozlowski]

On 12/01/2023 09:37, Lukas Bulwahn wrote:
> The s3c-cpu-freq header was previously included by:
> 
>   ./arch/arm/mach-s3c/mach-bast.c
>   ./arch/arm/mach-s3c/mach-osiris-dvs.c
>   ./arch/arm/mach-s3c/mach-osiris.c
>   ./include/linux/soc/samsung/s3c-cpufreq-core.h
> 
> Commit a4946a153cb9 ("ARM: s3c: remove all s3c24xx support") removes the
> files in ./arch/arm/mach-s3c/; commit daf0ee583fc7 ("cpufreq: remove
> s3c24xx drivers") removes the file s3c-cpufreq-core.h.
> 
> Remove this obsolete header file.
> 
> This issue was identified, as s3c-cpu-freq.h referred to the removed config
> ARM_S3C_CPUFREQ.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
> ---
>  include/linux/soc/samsung/s3c-cpu-freq.h | 145 -----------------------
>  1 file changed, 145 deletions(-)


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof


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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> Commit 0fee2eac5c2b ("usb: phy: remove phy-isp1301-omap driver") removes
> the Philips ISP1301 with OMAP OTG driver and its corresponding config
> ISP1301_OMAP. The drivers, OMAP USB Device Controller and OHCI support for
> OMAP1/2 chips, with corresponding configs, USB_OMAP and USB_OHCI_HCD_OMAP1,
> need this removed driver (see "depends on ISP1301_OMAP") to build.
>
> Remove those two drivers.
>
> With the config USB_OMAP removed in this commit, remove some further code
> in the omap-dma header and mach-omap1 architecture code.
>
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>

This would be a great cleanup because of the simplications of the
omap-dma code. I had previously looked at it and concluded that
the driver is still in use though, and I think my mistake was
just in the Kconfig part of this patch:

commit c32fd10914a314dd96c5d24030200070c84df5f1
Author: Arnd Bergmann <arnd@arndb.de>
Date:   Thu Sep 29 15:38:56 2022 +0200

    ARM: omap1: remove unused board files
    
    All board support that was marked as 'unused' earlier can
    now be removed, leaving the five machines that that still
    had someone using them in 2022, or that are supported in
    qemu.
    
    Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
    Cc: Janusz Krzysztofik <jmkrzyszt@gmail.com>
    Cc: Tony Lindgren <tony@atomide.com>
    Cc: linux-omap@vger.kernel.org
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index b3006d8b04ab..95751062078e 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -118,7 +118,7 @@ config USB_GR_UDC
 config USB_OMAP
        tristate "OMAP USB Device Controller"
        depends on ARCH_OMAP1
-       depends on ISP1301_OMAP || !(MACH_OMAP_H2 || MACH_OMAP_H3)
+       depends on ISP1301_OMAP
        help
           Many Texas Instruments OMAP processors have flexible full
           speed USB device controllers, with support for up to 30
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 0442dc4bc334..a0c14c62ff32 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -409,7 +409,7 @@ if USB_OHCI_HCD
 config USB_OHCI_HCD_OMAP1
        tristate "OHCI support for OMAP1/2 chips"
        depends on ARCH_OMAP1
-       depends on ISP1301_OMAP || !(MACH_OMAP_H2 || MACH_OMAP_H3)
+       depends on ISP1301_OMAP
        default y
        help
          Enables support for the OHCI controller on OMAP1/2 chips.

Instead of changing this to 'depends on ISP1301_OMAP', the line
probably should just be dropped entirely.

      Arnd

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Re: [PATCH 2/4] ARM: pxa: remove further dead code after pxa93 support removal

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> Commit 150ccb6f9a89 ("ARM: pxa: remove pxa93x support") removes configs
> CPU_PXA930 and CPU_PXA935 and uses of cpu_is_pxa93x() and cpu_is_pxa935().
>
> Remove some further dead code in ./include/linux/soc/pxa/cpu.h on top of
> that commit above.
>
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>

I had this in an earlier version and ended up leaving this bit in
when I reworked the series to not drop support for PXA310 and PXA320.

You are probably right that we should not reference the removed
Kconfig symbols, but I see that this causes a regression
unless I also bring back the change to

drivers/mmc/host/pxamci.c:                              || cpu_is_pxa935())

    Arnd

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Lukas Bulwahn]

On Thu, Jan 12, 2023 at 10:03 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> > Commit 0fee2eac5c2b ("usb: phy: remove phy-isp1301-omap driver") removes
> > the Philips ISP1301 with OMAP OTG driver and its corresponding config
> > ISP1301_OMAP. The drivers, OMAP USB Device Controller and OHCI support for
> > OMAP1/2 chips, with corresponding configs, USB_OMAP and USB_OHCI_HCD_OMAP1,
> > need this removed driver (see "depends on ISP1301_OMAP") to build.
> >
> > Remove those two drivers.
> >
> > With the config USB_OMAP removed in this commit, remove some further code
> > in the omap-dma header and mach-omap1 architecture code.
> >
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
>
> This would be a great cleanup because of the simplications of the
> omap-dma code. I had previously looked at it and concluded that
> the driver is still in use though, and I think my mistake was
> just in the Kconfig part of this patch:
>
> commit c32fd10914a314dd96c5d24030200070c84df5f1
> Author: Arnd Bergmann <arnd@arndb.de>
> Date:   Thu Sep 29 15:38:56 2022 +0200
>
>     ARM: omap1: remove unused board files
>
>     All board support that was marked as 'unused' earlier can
>     now be removed, leaving the five machines that that still
>     had someone using them in 2022, or that are supported in
>     qemu.
>
>     Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
>     Cc: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>     Cc: Tony Lindgren <tony@atomide.com>
>     Cc: linux-omap@vger.kernel.org
>     Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
> diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
> index b3006d8b04ab..95751062078e 100644
> --- a/drivers/usb/gadget/udc/Kconfig
> +++ b/drivers/usb/gadget/udc/Kconfig
> @@ -118,7 +118,7 @@ config USB_GR_UDC
>  config USB_OMAP
>         tristate "OMAP USB Device Controller"
>         depends on ARCH_OMAP1
> -       depends on ISP1301_OMAP || !(MACH_OMAP_H2 || MACH_OMAP_H3)
> +       depends on ISP1301_OMAP
>         help
>            Many Texas Instruments OMAP processors have flexible full
>            speed USB device controllers, with support for up to 30
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 0442dc4bc334..a0c14c62ff32 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -409,7 +409,7 @@ if USB_OHCI_HCD
>  config USB_OHCI_HCD_OMAP1
>         tristate "OHCI support for OMAP1/2 chips"
>         depends on ARCH_OMAP1
> -       depends on ISP1301_OMAP || !(MACH_OMAP_H2 || MACH_OMAP_H3)
> +       depends on ISP1301_OMAP
>         default y
>         help
>           Enables support for the OHCI controller on OMAP1/2 chips.
>
> Instead of changing this to 'depends on ISP1301_OMAP', the line
> probably should just be dropped entirely.
>

I see. Yes, probably, !(MACH_OMAP_H2 || MACH_OMAP_H3) is really in the
current state of the repository "always true", and hence this
dependency "depends on ISP1301_OMAP || !(MACH_OMAP_H2 ||
MACH_OMAP_H3)" is always independent of  ISP1301_OMAP.

Are you going to fix up your commit "ARM: omap1: remove unused board
files" with this change?

Please ignore this patch then; patch 1 and 4 still seem good to pick, though.

Lukas

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Re: [PATCH 2/4] ARM: pxa: remove further dead code after pxa93 support removal

[Lukas Bulwahn]

On Thu, Jan 12, 2023 at 10:06 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> > Commit 150ccb6f9a89 ("ARM: pxa: remove pxa93x support") removes configs
> > CPU_PXA930 and CPU_PXA935 and uses of cpu_is_pxa93x() and cpu_is_pxa935().
> >
> > Remove some further dead code in ./include/linux/soc/pxa/cpu.h on top of
> > that commit above.
> >
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
>
> I had this in an earlier version and ended up leaving this bit in
> when I reworked the series to not drop support for PXA310 and PXA320.
>
> You are probably right that we should not reference the removed
> Kconfig symbols, but I see that this causes a regression
> unless I also bring back the change to
>
> drivers/mmc/host/pxamci.c:                              || cpu_is_pxa935())
>

Thanks for the insights of your previous attempt. In my janitorial
work, I am just triggered by references to removed configs and hardly
have the resources to test all the various arm pxa configs. Let us
keep it as is for now, and see once your clean-up has settled in
mainline, if we find a good suitable further cleanup patch on these
code parts here then.

Lukas

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Tony Lindgren]

* Arnd Bergmann <arnd@arndb.de> [230112 09:03]:
> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> > Commit 0fee2eac5c2b ("usb: phy: remove phy-isp1301-omap driver") removes
> > the Philips ISP1301 with OMAP OTG driver and its corresponding config
> > ISP1301_OMAP. The drivers, OMAP USB Device Controller and OHCI support for
> > OMAP1/2 chips, with corresponding configs, USB_OMAP and USB_OHCI_HCD_OMAP1,
> > need this removed driver (see "depends on ISP1301_OMAP") to build.
> >
> > Remove those two drivers.
> >
> > With the config USB_OMAP removed in this commit, remove some further code
> > in the omap-dma header and mach-omap1 architecture code.
> >
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
> 
> This would be a great cleanup because of the simplications of the
> omap-dma code. I had previously looked at it and concluded that
> the driver is still in use though, and I think my mistake was
> just in the Kconfig part of this patch:

It sure would be nice to drop the old custom dma api in omap-dma.c
while keeping the dma.c in arch/arm/mach-omap1.

Regards,

Tony

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 10:19, Lukas Bulwahn wrote:
> On Thu, Jan 12, 2023 at 10:03 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> I see. Yes, probably, !(MACH_OMAP_H2 || MACH_OMAP_H3) is really in the
> current state of the repository "always true", and hence this
> dependency "depends on ISP1301_OMAP || !(MACH_OMAP_H2 ||
> MACH_OMAP_H3)" is always independent of  ISP1301_OMAP.
>
> Are you going to fix up your commit "ARM: omap1: remove unused board
> files" with this change?
>
> Please ignore this patch then; patch 1 and 4 still seem good to pick, though.

Done, I've applied those two and fixed up the other patch.

Thanks a lot for your series!

    Arnd

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote:
> * Arnd Bergmann <arnd@arndb.de> [230112 09:03]:
>> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
>> > Commit 0fee2eac5c2b ("usb: phy: remove phy-isp1301-omap driver") removes
>> > the Philips ISP1301 with OMAP OTG driver and its corresponding config
>> > ISP1301_OMAP. The drivers, OMAP USB Device Controller and OHCI support for
>> > OMAP1/2 chips, with corresponding configs, USB_OMAP and USB_OHCI_HCD_OMAP1,
>> > need this removed driver (see "depends on ISP1301_OMAP") to build.
>> >
>> > Remove those two drivers.
>> >
>> > With the config USB_OMAP removed in this commit, remove some further code
>> > in the omap-dma header and mach-omap1 architecture code.
>> >
>> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
>> 
>> This would be a great cleanup because of the simplications of the
>> omap-dma code. I had previously looked at it and concluded that
>> the driver is still in use though, and I think my mistake was
>> just in the Kconfig part of this patch:
>
> It sure would be nice to drop the old custom dma api in omap-dma.c
> while keeping the dma.c in arch/arm/mach-omap1.

I see that four out of the five remaining board files still use
omap_udc, which is the only remaining user of the custom
DMA interface. What I had not noticed earlier is that DMA support
in that driver is actually optional, though it's hardwired
to be enabled.

So if we want to kill off the old DMA stuff there is actually
a choice between either making omap_udc PIO-only or converting
it to use the standard dmaengine interface.

    Arnd

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Re: [PATCH 2/4] ARM: pxa: remove further dead code after pxa93 support removal

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 10:26, Lukas Bulwahn wrote:
> On Thu, Jan 12, 2023 at 10:06 AM Arnd Bergmann <arnd@arndb.de> wrote:
>>
>> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
>> > Commit 150ccb6f9a89 ("ARM: pxa: remove pxa93x support") removes configs
>> > CPU_PXA930 and CPU_PXA935 and uses of cpu_is_pxa93x() and cpu_is_pxa935().
>> >
>> > Remove some further dead code in ./include/linux/soc/pxa/cpu.h on top of
>> > that commit above.
>> >
>> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
>>
>> I had this in an earlier version and ended up leaving this bit in
>> when I reworked the series to not drop support for PXA310 and PXA320.
>>
>> You are probably right that we should not reference the removed
>> Kconfig symbols, but I see that this causes a regression
>> unless I also bring back the change to
>>
>> drivers/mmc/host/pxamci.c:                              || cpu_is_pxa935())
>>
>
> Thanks for the insights of your previous attempt. In my janitorial
> work, I am just triggered by references to removed configs and hardly
> have the resources to test all the various arm pxa configs. Let us
> keep it as is for now, and see once your clean-up has settled in
> mainline, if we find a good suitable further cleanup patch on these
> code parts here then.

Sounds good, thanks.

It's very helpful to have you checks trigger on my modified patches
as that shows what I have missed in the updates, as well as showing
that the initial step I had done did not contain such mistakes.

The procedure I used to create my series was to remove all the
boards marked as 'depends on UNUSED_BOARD_FILES' and then recursively
remove orphaned header Kconfig symbols, header files.

There is another related set of patches that started looking
into, which is for device drivers that

- register a platform_driver, i2c_driver or spi_driver
- have no support of probing from DT or ACPI
- have no remaining device registration in tree

See below for the list that I came up with. I only annotated
the drivers at this point, as these are slightly more
controversial than the files that are clearly dead code
based on existing Kconfig dependencies etc.

If you're interested in helping out with these, feel free
to take anything from this list and send patches directly
to the subsystem maintainers.

    Arnd

---
commit 853e389693ce4da709641cbeb46a8f405d92287a
Author: Arnd Bergmann <arnd@arndb.de>
Date:   Fri Oct 14 16:20:09 2022 +0200

    depends-on-unused
    
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3604074a878b..1c7e8ea4812c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -735,6 +735,7 @@ config X86_SUPPORTS_MEMORY_FAILURE
 config STA2X11
 	bool "STA2X11 Companion Chip Support"
 	depends on X86_32_NON_STANDARD && PCI
+	depends on UNUSED
 	select SWIOTLB
 	select MFD_STA2X11
 	select GPIOLIB
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 0d4447df7200..3cad5c320add 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -305,6 +305,7 @@ config RPR0521
 config SENSORS_LM3533
 	tristate "LM3533 ambient light sensor"
 	depends on MFD_LM3533
+	depends on UNUSED
 	help
 	  If you say yes here you get support for the ambient light sensor
 	  interface on National Semiconductor / TI LM3533 Lighting Power
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index d98650426dc2..8d11945f5bd6 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -30,6 +30,7 @@ config KEYBOARD_ADC
 config KEYBOARD_ADP5520
 	tristate "Keypad Support for ADP5520 PMIC"
 	depends on PMIC_ADP5520
+	depends on UNUSED
 	help
 	  This option enables support for the keypad scan matrix
 	  on Analog Devices ADP5520 PMICs.
@@ -53,6 +54,7 @@ config KEYBOARD_ADP5588
 config KEYBOARD_ADP5589
 	tristate "ADP5585/ADP5589 I2C QWERTY Keypad and IO Expander"
 	depends on I2C
+	depends on UNUSED
 	help
 	  Say Y here if you want to use a ADP5585/ADP5589 attached to your
 	  system I2C bus.
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5c2d0c06d2a5..578cb73ed59e 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -45,6 +45,7 @@ config INPUT_AB8500_PONKEY
 
 config INPUT_AD714X
 	tristate "Analog Devices AD714x Capacitance Touch Sensor"
+	depends on UNUSED
 	help
 	  Say Y here if you want to support an AD7142/3/7/8/7A touch sensor.
 
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 1a2049b336a6..61bb8e632413 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -46,6 +46,7 @@ config TOUCHSCREEN_ADS7846
 config TOUCHSCREEN_AD7877
 	tristate "AD7877 based touchscreens"
 	depends on SPI_MASTER
+	depends on UNUSED
 	help
 	  Say Y here if you have a touchscreen interface using the
 	  AD7877 controller, and your board-specific initialization
diff --git a/drivers/media/pci/sta2x11/Kconfig b/drivers/media/pci/sta2x11/Kconfig
index 118b922c08c3..3153544c0600 100644
--- a/drivers/media/pci/sta2x11/Kconfig
+++ b/drivers/media/pci/sta2x11/Kconfig
@@ -3,6 +3,7 @@ config STA2X11_VIP
 	tristate "STA2X11 VIP Video For Linux"
 	depends on PCI && VIDEO_DEV && I2C
 	depends on STA2X11 || COMPILE_TEST
+	depends on UNUSED
 	select GPIOLIB if MEDIA_SUBDRV_AUTOSELECT
 	select VIDEO_ADV7180 if MEDIA_SUBDRV_AUTOSELECT
 	select VIDEOBUF2_DMA_CONTIG
diff --git a/drivers/media/platform/samsung/s3c-camif/Kconfig b/drivers/media/platform/samsung/s3c-camif/Kconfig
index f359f6382fff..0132b0f13dec 100644
--- a/drivers/media/platform/samsung/s3c-camif/Kconfig
+++ b/drivers/media/platform/samsung/s3c-camif/Kconfig
@@ -4,6 +4,7 @@ config VIDEO_S3C_CAMIF
 	depends on V4L_PLATFORM_DRIVERS
 	depends on VIDEO_DEV && I2C && PM
 	depends on ARCH_S3C64XX || COMPILE_TEST
+	depends on UNUSED
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select VIDEOBUF2_DMA_CONTIG
diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index 616a38feb641..46b9606837f4 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -144,6 +144,7 @@ config RADIO_TIMBERDALE
 config RADIO_WL1273
 	tristate "Texas Instruments WL1273 I2C FM Radio"
 	depends on I2C
+	depends on UNUSED
 	select MFD_CORE
 	select MFD_WL1273_CORE
 	select FW_LOADER
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 5c24841e5699..df7132c56e1e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -104,6 +104,7 @@ config MFD_AS3722
 config PMIC_ADP5520
 	bool "Analog Devices ADP5520/01 MFD PMIC Core Support"
 	depends on I2C=y
+	depends on UNUSED
 	help
 	  Say yes here to add support for Analog Devices ADP5520 and ADP5501,
 	  Multifunction Power Management IC. This includes
@@ -116,6 +117,7 @@ config MFD_AAT2870_CORE
 	select MFD_CORE
 	depends on I2C=y
 	depends on GPIOLIB || COMPILE_TEST
+	depends on UNUSED
 	help
 	  If you say yes here you get support for the AAT2870.
 	  This driver provides common support for accessing the device,
@@ -303,6 +305,7 @@ config MFD_CS47L92
 config PMIC_DA903X
 	bool "Dialog Semiconductor DA9030/DA9034 PMIC Support"
 	depends on I2C=y
+	depends on UNUSED
 	help
 	  Say yes here to add support for Dialog Semiconductor DA9030 (a.k.a
 	  ARAVA) and DA9034 (a.k.a MICCO), these are Power Management IC
@@ -988,6 +991,7 @@ config MFD_OCELOT
 config EZX_PCAP
 	bool "Motorola EZXPCAP Support"
 	depends on SPI_MASTER
+	depends on UNUSED
 	help
 	  This enables the PCAP ASIC present on EZX Phones. This is
 	  needed for MMC, TouchScreen, Sound, USB, etc..
@@ -1040,6 +1044,7 @@ config MFD_RETU
 
 config MFD_PCF50633
 	tristate "NXP PCF50633"
+	depends on UNUSED
 	depends on I2C
 	select REGMAP_I2C
 	help
@@ -1164,6 +1169,7 @@ config MFD_RT5120
 config MFD_RC5T583
 	bool "Ricoh RC5T583 Power Management system device"
 	depends on I2C=y
+	depends on UNUSED
 	select MFD_CORE
 	select REGMAP_I2C
 	help
@@ -1225,6 +1231,7 @@ config MFD_SEC_CORE
 config MFD_SI476X_CORE
 	tristate "Silicon Laboratories 4761/64/68 AM/FM radio."
 	depends on I2C
+	depends on UNUSED
 	select MFD_CORE
 	select REGMAP_I2C
 	help
@@ -1387,6 +1394,7 @@ endmenu
 config MFD_STA2X11
 	bool "STMicroelectronics STA2X11"
 	depends on STA2X11
+	depends on UNUSED
 	select MFD_CORE
 	select REGMAP_MMIO
 
@@ -1431,6 +1439,7 @@ config MFD_LP3943
 config MFD_LP8788
 	bool "TI LP8788 Power Management Unit Driver"
 	depends on I2C=y
+	depends on UNUSED
 	select MFD_CORE
 	select REGMAP_I2C
 	select IRQ_DOMAIN
@@ -1723,6 +1732,7 @@ config MENELAUS
 config MFD_WL1273_CORE
 	tristate "TI WL1273 FM radio"
 	depends on I2C
+	depends on UNUSED
 	select MFD_CORE
 	default n
 	help
@@ -1732,6 +1742,7 @@ config MFD_WL1273_CORE
 
 config MFD_LM3533
 	tristate "TI/National Semiconductor LM3533 Lighting Power chip"
+	depends on UNUSED
 	depends on I2C
 	select MFD_CORE
 	select REGMAP_I2C
@@ -1850,6 +1861,7 @@ config MFD_WM8400
 	bool "Wolfson Microelectronics WM8400"
 	select MFD_CORE
 	depends on I2C=y
+	depends on UNUSED
 	select REGMAP_I2C
 	help
 	  Support for the Wolfson Microelecronics WM8400 PMIC and audio
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 9947b7892bd5..b99a94080b2a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -352,6 +352,7 @@ config SENSORS_TSL2550
 config SENSORS_BH1770
 	 tristate "BH1770GLC / SFH7770 combined ALS - Proximity sensor"
 	 depends on I2C
+	depends on UNUSED
 	help
 	   Say Y here if you want to build a driver for BH1770GLC (ROHM) or
 	   SFH7770 (Osram) combined ambient light and proximity sensor chip.
@@ -362,6 +363,7 @@ config SENSORS_BH1770
 config SENSORS_APDS990X
 	 tristate "APDS990X combined als and proximity sensors"
 	 depends on I2C
+	depends on UNUSED
 	help
 	   Say Y here if you want to build a driver for Avago APDS990x
 	   combined ambient light and proximity sensor chip.
diff --git a/drivers/misc/ti-st/Kconfig b/drivers/misc/ti-st/Kconfig
index 1503a6496f63..6be14cbfa023 100644
--- a/drivers/misc/ti-st/Kconfig
+++ b/drivers/misc/ti-st/Kconfig
@@ -8,6 +8,7 @@ config TI_ST
 	tristate "Shared transport core driver"
 	depends on NET && TTY
 	depends on GPIOLIB || COMPILE_TEST
+	depends on UNUSED
 	select FW_LOADER
 	help
 	  This enables the shared transport core driver for TI
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 323ec56e8a74..cf1b9abc1f87 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -111,6 +111,7 @@ config KORINA
 config LANTIQ_ETOP
 	tristate "Lantiq SoC ETOP driver"
 	depends on SOC_TYPE_XWAY
+	depends on UNUSED
 	help
 	  Support for the MII0 inside the Lantiq SoC
 
diff --git a/drivers/net/ethernet/wiznet/Kconfig b/drivers/net/ethernet/wiznet/Kconfig
index 4bac2ad2d6a1..1f7a7edfa0b9 100644
--- a/drivers/net/ethernet/wiznet/Kconfig
+++ b/drivers/net/ethernet/wiznet/Kconfig
@@ -33,6 +33,7 @@ config WIZNET_W5100
 config WIZNET_W5300
 	tristate "WIZnet W5300 Ethernet support"
 	depends on HAS_IOMEM
+	depends on UNUSED
 	help
 	  Support for WIZnet W5300 chips.
 
diff --git a/drivers/net/wireless/marvell/libertas/Kconfig b/drivers/net/wireless/marvell/libertas/Kconfig
index 6d62ab49aa8d..287c2c84b412 100644
--- a/drivers/net/wireless/marvell/libertas/Kconfig
+++ b/drivers/net/wireless/marvell/libertas/Kconfig
@@ -30,6 +30,7 @@ config LIBERTAS_SDIO
 config LIBERTAS_SPI
 	tristate "Marvell Libertas 8686 SPI 802.11b/g cards"
 	depends on LIBERTAS && SPI
+	depends on UNUSED
 	help
 	  A driver for Marvell Libertas 8686 SPI devices.
 
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index e2f8dfcdd2a9..44f5f8a69672 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -281,6 +281,7 @@ config BATTERY_BQ27XXX_DT_UPDATES_NVM
 
 config BATTERY_DA9030
 	tristate "DA9030 battery driver"
+	depends on UNUSED
 	depends on PMIC_DA903X
 	help
 	  Say Y here to enable support for batteries charger integrated into
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 820c9a0788e5..39d176052bef 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -463,6 +463,7 @@ config REGULATOR_LOCHNAGAR
 
 config REGULATOR_LP3971
 	tristate "National Semiconductors LP3971 PMIC regulator driver"
+	depends on UNUSED
 	depends on I2C
 	help
 	 Say Y here to support the voltage regulators and convertors
@@ -470,6 +471,7 @@ config REGULATOR_LP3971
 
 config REGULATOR_LP3972
 	tristate "National Semiconductors LP3972 PMIC regulator driver"
+	depends on UNUSED
 	depends on I2C
 	help
 	 Say Y here to support the voltage regulators and convertors
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 2aba88a57a77..f8379e709c64 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -1157,6 +1157,7 @@ config SPI_LOOPBACK_TEST
 config SPI_TLE62X0
 	tristate "Infineon TLE62X0 (for power switching)"
 	depends on SYSFS
+	depends on UNUSED
 	help
 	  SPI driver for Infineon TLE62X0 series line driver chips,
 	  such as the TLE6220, TLE6230 and TLE6240.  This provides a
diff --git a/drivers/staging/media/omap4iss/Kconfig b/drivers/staging/media/omap4iss/Kconfig
index 6d1f55b09132..698dfcb286b6 100644
--- a/drivers/staging/media/omap4iss/Kconfig
+++ b/drivers/staging/media/omap4iss/Kconfig
@@ -4,6 +4,7 @@ config VIDEO_OMAP4
 	tristate "OMAP 4 Camera support"
 	depends on VIDEO_DEV  && I2C
 	depends on ARCH_OMAP4 || COMPILE_TEST
+	depends on UNUSED
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select MFD_SYSCON
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index ed0672d2d0ef..c50a7bbd9c54 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -316,6 +316,7 @@ config SERIAL_TEGRA_TCU_CONSOLE
 config SERIAL_MAX3100
 	tristate "MAX3100 support"
 	depends on SPI
+	depends on UNUSED
 	select SERIAL_CORE
 	help
 	  MAX3100 chip support
diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 511ab57cdc81..3384025f482e 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -209,6 +209,7 @@ config USB_PXA27X
 config USB_MV_UDC
 	tristate "Marvell USB2.0 Device Controller"
 	depends on HAS_DMA
+	depends on UNUSED
 	help
 	  Marvell Socs (including PXA and MMP series) include a high speed
 	  USB2.0 OTG controller, which can be configured as high speed or
@@ -217,6 +218,7 @@ config USB_MV_UDC
 config USB_MV_U3D
 	depends on HAS_DMA
 	tristate "MARVELL PXA2128 USB 3.0 controller"
+	depends on UNUSED
 	help
 	  MARVELL PXA2128 Processor series include a super speed USB3.0 device
 	  controller, which support super speed USB peripheral.
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index a97923897c8e..c7fadc9b5c23 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -368,7 +368,7 @@ config USB_ISP116X_HCD
 config USB_ISP1362_HCD
 	tristate "ISP1362 HCD support"
 	depends on HAS_IOMEM
-	depends on COMPILE_TEST # nothing uses this
+	depends on UNUSED # nothing uses this
 	help
 	  Supports the Philips ISP1362 chip as a host controller
 
@@ -654,6 +654,7 @@ config USB_U132_HCD
 config USB_SL811_HCD
 	tristate "SL811HS HCD support"
 	depends on HAS_IOMEM
+	depends on UNUSED
 	help
 	  The SL811HS is a single-port USB controller that supports either
 	  host side or peripheral side roles.  Enable this option if your
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 5f629d7cad64..efa798b2d56e 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -130,6 +130,7 @@ config USB_MV_OTG
 	tristate "Marvell USB OTG support"
 	depends on USB_EHCI_MV && USB_MV_UDC && PM && USB_OTG
 	depends on USB_GADGET || !USB_GADGET # if USB_GADGET=m, this can't be 'y'
+	depends on UNUSED
 	select USB_PHY
 	help
 	  Say Y here if you want to build Marvell USB OTG transceiver
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 2f5219cc36b4..4c5f4b188293 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1770,6 +1770,7 @@ config FB_PXA168
 	tristate "PXA168/910 LCD framebuffer support"
 	depends on FB && HAVE_CLK && HAS_IOMEM
 	depends on CPU_PXA168 || CPU_PXA910 || COMPILE_TEST
+	depends on UNUSED
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
@@ -2003,6 +2004,7 @@ config FB_DA8XX
 	tristate "DA8xx/OMAP-L1xx/AM335x Framebuffer support"
 	depends on FB && HAVE_CLK && HAS_IOMEM
 	depends on ARCH_DAVINCI_DA8XX || SOC_AM33XX || COMPILE_TEST
+	depends on UNUSED
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
@@ -2128,6 +2130,7 @@ config FB_PRE_INIT_FB
 config FB_MX3
 	tristate "MX3 Framebuffer support"
 	depends on FB && MX3_IPU
+	depends on UNUSED
 	select BACKLIGHT_CLASS_DEVICE
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
diff --git a/drivers/video/fbdev/mmp/fb/Kconfig b/drivers/video/fbdev/mmp/fb/Kconfig
index 0ec2e3fb9e17..18eaf625b67b 100644
--- a/drivers/video/fbdev/mmp/fb/Kconfig
+++ b/drivers/video/fbdev/mmp/fb/Kconfig
@@ -2,6 +2,7 @@
 config MMP_FB
 	tristate "fb driver for Marvell MMP Display Subsystem"
 	depends on FB
+	depends on UNUSED
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
diff --git a/sound/spi/Kconfig b/sound/spi/Kconfig
index f407c37c37fa..e93a1abfd7bd 100644
--- a/sound/spi/Kconfig
+++ b/sound/spi/Kconfig
@@ -13,6 +13,7 @@ if SND_SPI
 config SND_AT73C213
 	tristate "Atmel AT73C213 DAC driver"
 	depends on ATMEL_SSC
+	depends on UNUSED
 	select SND_PCM
 	help
 	  Say Y here if you want to use the Atmel AT73C213 external DAC. This

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Aaro Koskinen]

Hi,

On Thu, Jan 12, 2023 at 11:19:53AM +0100, Arnd Bergmann wrote:
> On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote:
> > * Arnd Bergmann <arnd@arndb.de> [230112 09:03]:
> >> On Thu, Jan 12, 2023, at 09:37, Lukas Bulwahn wrote:
> >> > Commit 0fee2eac5c2b ("usb: phy: remove phy-isp1301-omap driver") removes
> >> > the Philips ISP1301 with OMAP OTG driver and its corresponding config
> >> > ISP1301_OMAP. The drivers, OMAP USB Device Controller and OHCI support for
> >> > OMAP1/2 chips, with corresponding configs, USB_OMAP and USB_OHCI_HCD_OMAP1,
> >> > need this removed driver (see "depends on ISP1301_OMAP") to build.
> >> >
> >> > Remove those two drivers.
> >> >
> >> > With the config USB_OMAP removed in this commit, remove some further code
> >> > in the omap-dma header and mach-omap1 architecture code.
> >> >
> >> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
> >> 
> >> This would be a great cleanup because of the simplications of the
> >> omap-dma code. I had previously looked at it and concluded that
> >> the driver is still in use though, and I think my mistake was
> >> just in the Kconfig part of this patch:
> >
> > It sure would be nice to drop the old custom dma api in omap-dma.c
> > while keeping the dma.c in arch/arm/mach-omap1.
> 
> I see that four out of the five remaining board files still use
> omap_udc, which is the only remaining user of the custom
> DMA interface. What I had not noticed earlier is that DMA support
> in that driver is actually optional, though it's hardwired
> to be enabled.
> 
> So if we want to kill off the old DMA stuff there is actually
> a choice between either making omap_udc PIO-only or converting
> it to use the standard dmaengine interface.

I use this driver on Palm TE and 770, and without it those boards would
be useless for my use cases. Also DMA doubles the throughput, probably
also power usage is smaller.

A.

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Arnd Bergmann]

On Thu, Jan 12, 2023, at 15:05, Aaro Koskinen wrote:
> On Thu, Jan 12, 2023 at 11:19:53AM +0100, Arnd Bergmann wrote:
>> On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote:
>> 
>> So if we want to kill off the old DMA stuff there is actually
>> a choice between either making omap_udc PIO-only or converting
>> it to use the standard dmaengine interface.
>
> I use this driver on Palm TE and 770, and without it those boards would
> be useless for my use cases. Also DMA doubles the throughput, probably
> also power usage is smaller.

Ok, if the performance is important, converting to dmaengine
is probably best. Do you know if this is just a straightforward
replacement of the function calls, or are there technical reasons
why it's not using the dmaengine interface yet?

     Arnd

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Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips

[Tony Lindgren]

* Arnd Bergmann <arnd@arndb.de> [230112 14:31]:
> On Thu, Jan 12, 2023, at 15:05, Aaro Koskinen wrote:
> > On Thu, Jan 12, 2023 at 11:19:53AM +0100, Arnd Bergmann wrote:
> >> On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote:
> >> 
> >> So if we want to kill off the old DMA stuff there is actually
> >> a choice between either making omap_udc PIO-only or converting
> >> it to use the standard dmaengine interface.
> >
> > I use this driver on Palm TE and 770, and without it those boards would
> > be useless for my use cases. Also DMA doubles the throughput, probably
> > also power usage is smaller.
> 
> Ok, if the performance is important, converting to dmaengine
> is probably best. Do you know if this is just a straightforward
> replacement of the function calls, or are there technical reasons
> why it's not using the dmaengine interface yet?

Yes I agree dmaengine is the best solution. Seems like this is the
last driver using the old api that never got updated probably because
it's not used on the newer SoCs.

I don't think there are any technical reasons to not use dmaengine
here.

FYI, the last blocker for dmaengine use was for drivers using
port_window that got added with the drivers/usb/musb/tusb6010_omap.c
dmaengine conversion a few years back.

Regards,

Tony

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