On Fri, Dec 06, 2013 at 10:28:12AM +0100, Marc Kleine-Budde wrote:
> On 12/06/2013 07:49 AM, Peter Chen wrote:
> > On Thu, Dec 05, 2013 at 12:32:57PM +0100, Marc Kleine-Budde wrote:
> >> This patch makes the controller register map ci_regs_nolpm and ci_regs_lpm
> >> as
> >> "const". Further, as all offset fit into a single byte, the type is changed
> >> from uintptr_t to u8.
> >>
> >> Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
> >> ---
> >> drivers/usb/chipidea/core.c | 80
> >> ++++++++++++++++++++++-----------------------
> >> 1 file changed, 40 insertions(+), 40 deletions(-)
> >>
> >> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> >> index 02929ee..dae16b3 100644
> >> --- a/drivers/usb/chipidea/core.c
> >> +++ b/drivers/usb/chipidea/core.c
> >> @@ -75,48 +75,48 @@
> >> #include "otg.h"
> >>
> >> /* Controller register map */
> >> -static uintptr_t ci_regs_nolpm[] = {
> >> - [CAP_CAPLENGTH] = 0x000UL,
> >> - [CAP_HCCPARAMS] = 0x008UL,
> >> - [CAP_DCCPARAMS] = 0x024UL,
> >> - [CAP_TESTMODE] = 0x038UL,
> >> - [OP_USBCMD] = 0x000UL,
> >> - [OP_USBSTS] = 0x004UL,
> >> - [OP_USBINTR] = 0x008UL,
> >> - [OP_DEVICEADDR] = 0x014UL,
> >> - [OP_ENDPTLISTADDR] = 0x018UL,
> >> - [OP_PORTSC] = 0x044UL,
> >> - [OP_DEVLC] = 0x084UL,
> >> - [OP_OTGSC] = 0x064UL,
> >> - [OP_USBMODE] = 0x068UL,
> >> - [OP_ENDPTSETUPSTAT] = 0x06CUL,
> >> - [OP_ENDPTPRIME] = 0x070UL,
> >> - [OP_ENDPTFLUSH] = 0x074UL,
> >> - [OP_ENDPTSTAT] = 0x078UL,
> >> - [OP_ENDPTCOMPLETE] = 0x07CUL,
> >> - [OP_ENDPTCTRL] = 0x080UL,
> >> +static const u8 ci_regs_nolpm[] = {
> >> + [CAP_CAPLENGTH] = 0x00U,
> >> + [CAP_HCCPARAMS] = 0x08U,
> >> + [CAP_DCCPARAMS] = 0x24U,
> >> + [CAP_TESTMODE] = 0x38U,
> >> + [OP_USBCMD] = 0x00U,
> >> + [OP_USBSTS] = 0x04U,
> >> + [OP_USBINTR] = 0x08U,
> >> + [OP_DEVICEADDR] = 0x14U,
> >> + [OP_ENDPTLISTADDR] = 0x18U,
> >> + [OP_PORTSC] = 0x44U,
> >> + [OP_DEVLC] = 0x84U,
> >> + [OP_OTGSC] = 0x64U,
> >> + [OP_USBMODE] = 0x68U,
> >> + [OP_ENDPTSETUPSTAT] = 0x6CU,
> >> + [OP_ENDPTPRIME] = 0x70U,
> >> + [OP_ENDPTFLUSH] = 0x74U,
> >> + [OP_ENDPTSTAT] = 0x78U,
> >> + [OP_ENDPTCOMPLETE] = 0x7CU,
> >> + [OP_ENDPTCTRL] = 0x80U,
> >> };
> >>
> >> -static uintptr_t ci_regs_lpm[] = {
> >> - [CAP_CAPLENGTH] = 0x000UL,
> >> - [CAP_HCCPARAMS] = 0x008UL,
> >> - [CAP_DCCPARAMS] = 0x024UL,
> >> - [CAP_TESTMODE] = 0x0FCUL,
> >> - [OP_USBCMD] = 0x000UL,
> >> - [OP_USBSTS] = 0x004UL,
> >> - [OP_USBINTR] = 0x008UL,
> >> - [OP_DEVICEADDR] = 0x014UL,
> >> - [OP_ENDPTLISTADDR] = 0x018UL,
> >> - [OP_PORTSC] = 0x044UL,
> >> - [OP_DEVLC] = 0x084UL,
> >> - [OP_OTGSC] = 0x0C4UL,
> >> - [OP_USBMODE] = 0x0C8UL,
> >> - [OP_ENDPTSETUPSTAT] = 0x0D8UL,
> >> - [OP_ENDPTPRIME] = 0x0DCUL,
> >> - [OP_ENDPTFLUSH] = 0x0E0UL,
> >> - [OP_ENDPTSTAT] = 0x0E4UL,
> >> - [OP_ENDPTCOMPLETE] = 0x0E8UL,
> >> - [OP_ENDPTCTRL] = 0x0ECUL,
> >> +static const u8 ci_regs_lpm[] = {
> >> + [CAP_CAPLENGTH] = 0x00U,
> >> + [CAP_HCCPARAMS] = 0x08U,
> >> + [CAP_DCCPARAMS] = 0x24U,
> >> + [CAP_TESTMODE] = 0xFCU,
> >> + [OP_USBCMD] = 0x00U,
> >> + [OP_USBSTS] = 0x04U,
> >> + [OP_USBINTR] = 0x08U,
> >> + [OP_DEVICEADDR] = 0x14U,
> >> + [OP_ENDPTLISTADDR] = 0x18U,
> >> + [OP_PORTSC] = 0x44U,
> >> + [OP_DEVLC] = 0x84U,
> >> + [OP_OTGSC] = 0xC4U,
> >> + [OP_USBMODE] = 0xC8U,
> >> + [OP_ENDPTSETUPSTAT] = 0xD8U,
> >> + [OP_ENDPTPRIME] = 0xDCU,
> >> + [OP_ENDPTFLUSH] = 0xE0U,
> >> + [OP_ENDPTSTAT] = 0xE4U,
> >> + [OP_ENDPTCOMPLETE] = 0xE8U,
> >> + [OP_ENDPTCTRL] = 0xECU,
> >> };
> >>
> >
> > Add "const" is a good fix, but I can't see much benefit of
> > change uintptr_t to u8 except reduce the kernel data segment.
> > Using uintprt_t make the code easier to read as the reader
> > can know it stands for pointer.
>
> No, it's not a pointer, it's an offset that added to the address __iomem
> pointer later. And it should never be used directly, it only used to
> setup the regmap.
>
I am OK with this patch.
--
Best Regards,
Peter Chen
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