From mboxrd@z Thu Jan 1 00:00:00 1970 From: rnayak@ti.com (Rajendra Nayak) Date: Mon, 25 Jun 2012 11:00:13 +0530 Subject: [PATCH 06/11] gpio/omap: add clk_prepare and clk_unprepare In-Reply-To: References: <1340372890-10091-1-git-send-email-rnayak@ti.com> <1340372890-10091-7-git-send-email-rnayak@ti.com> Message-ID: <4FE7F765.40405@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Saturday 23 June 2012 12:47 AM, Paul Walmsley wrote: > Hi > > On Fri, 22 Jun 2012, Rajendra Nayak wrote: > >> In preparation of OMAP moving to Common Clk Framework(CCF) add clk_prepare() >> for omap gpio debounce clock. >> >> Signed-off-by: Rajendra Nayak >> Cc: Grant Likely >> --- >> drivers/gpio/gpio-omap.c | 2 ++ >> 1 files changed, 2 insertions(+), 0 deletions(-) >> >> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c >> index c4ed172..6a73b01 100644 >> --- a/drivers/gpio/gpio-omap.c >> +++ b/drivers/gpio/gpio-omap.c >> @@ -893,6 +893,8 @@ static int gpio_debounce(struct gpio_chip *chip, unsigned offset, >> bank->dbck = clk_get(bank->dev, "dbclk"); >> if (IS_ERR(bank->dbck)) >> dev_err(bank->dev, "Could not get gpio dbck\n"); >> + else >> + clk_prepare(bank->dbck); >> } >> >> spin_lock_irqsave(&bank->lock, flags); > > What code unprepares this clock? > > Put differently, doesn't this driver need at least a platform_driver > .remove function pointer, that would call clk_unprepare() and clk_put()? Maybe because this driver can never be built as a module. It gets complied in with CONFIG_ARCH_OMAP=y. Adding Tarun and Santosh who can comment further. > > Also, it looks to me that the bank->dbck init should be in > omap_gpio_chip_init(), not gpio_debounce()? Tarun, can you comment on why the dbck init is in gpio_debounce and not in omap_gpio_chip_init()? > > > - Paul