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Message-ID: <74d0deb30907290832u6f718443nab9daf996417c9be@mail.gmail.com>
Date: Wed, 29 Jul 2009 17:32:11 +0200
From: pHilipp Zabel <philipp.zabel@...il.com>
To: Guennadi Liakhovetski <g.liakhovetski@....de>
Cc: Ian Molton <ian@...menth.co.uk>, linux-kernel@...r.kernel.org,
Magnus Damm <damm@...nsource.se>, akpm@...ux-foundation.org,
Matt Fleming <matt@...sole-pimps.org>,
Philip Langdale <philipl@...rt.org>
Subject: Re: [PATCH] tmio_mmc: Optionally support using platform clock
On Wed, Jul 29, 2009 at 5:20 PM, pHilipp Zabel<philipp.zabel@...il.com> wrote:
> On Tue, Jul 28, 2009 at 9:51 AM, Guennadi
> Liakhovetski<g.liakhovetski@....de> wrote:
>> If the platform device has a clock associated with the tmio-mmc device,
>> use it.
>>
>> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
>> Cc: Magnus Damm <damm@...nsource.se>
>> ---
>>
>> Depends (at least logically) on
>> http://marc.info/?l=linux-kernel&m=124782904228865&w=2
>>
>> Sorry if I forgot anyone who volunteered to help out with MMC patches.
>>
>> drivers/mmc/host/tmio_mmc.c | 21 +++++++++++++++++++++
>> drivers/mmc/host/tmio_mmc.h | 3 +++
>> include/linux/mfd/tmio.h | 1 +
>> 3 files changed, 25 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
>> index c246191..2a01572 100644
>> --- a/drivers/mmc/host/tmio_mmc.c
>> +++ b/drivers/mmc/host/tmio_mmc.c
>> @@ -32,6 +32,7 @@
>> #include <linux/mmc/host.h>
>> #include <linux/mfd/core.h>
>> #include <linux/mfd/tmio.h>
>> +#include <linux/clk.h>
>>
>> #include "tmio_mmc.h"
>>
>> @@ -57,10 +58,18 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
>> sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
>> sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
>> msleep(10);
>> + if (!IS_ERR(host->clk) && host->clk_is_running) {
>> + clk_disable(host->clk);
>> + host->clk_is_running = false;
>> + }
>> }
>>
>> static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
>> {
>> + if (!IS_ERR(host->clk) && !host->clk_is_running &&
>> + !clk_enable(host->clk))
>> + host->clk_is_running = true;
>> +
>> sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
>> sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
>> msleep(10);
>> @@ -567,6 +576,11 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
>> goto unmap_cnf;
>> }
>>
>> + host->clk = clk_get(&dev->dev, pdata->clk_name);
>
> Instead of pdata->clk_name, this should be either NULL or better
> "HCLK" (to differentiate from CLK32, not sure if we want to be able to
> toggle that, too, in the future).
> Passing the clock consumer ID via pdata is just wrong and shouldn't be
> needed with clkdev.
>
>> +
>> + if (!IS_ERR(host->clk) && !clk_enable(host->clk))
>> + host->clk_is_running = true;
>> +
>> /* Enable the MMC/SD Control registers */
>> sd_config_write16(host, CNF_CMD, SDCREN);
>> sd_config_write32(host, CNF_CTL_BASE,
>> @@ -608,6 +622,11 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
>> return 0;
>>
>> unmap_cnf:
>> + if (!IS_ERR(host->clk)) {
>> + clk_disable(host->clk);
>> + host->clk_is_running = false;
>> + clk_put(host->clk);
>> + }
>> if (host->cnf)
>> iounmap(host->cnf);
>> unmap_ctl:
>> @@ -632,6 +651,8 @@ static int __devexit tmio_mmc_remove(struct platform_device *dev)
>> if (host->cnf)
>> iounmap(host->cnf);
>> mmc_free_host(mmc);
>> + if (!IS_ERR(host->clk))
>> + clk_put(host->clk);
>> }
>>
>> return 0;
>> diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
>> index 45f06aa..a76d237 100644
>> --- a/drivers/mmc/host/tmio_mmc.h
>> +++ b/drivers/mmc/host/tmio_mmc.h
>> @@ -108,6 +108,7 @@
>> sd_ctrl_write32((host), CTL_STATUS, mask); \
>> } while (0)
>>
>> +struct clk;
>>
>> struct tmio_mmc_host {
>> void __iomem *cnf;
>> @@ -117,6 +118,8 @@ struct tmio_mmc_host {
>> struct mmc_request *mrq;
>> struct mmc_data *data;
>> struct mmc_host *mmc;
>> + struct clk *clk;
>> + bool clk_is_running;
>> int irq;
>>
>> /* pio related stuff */
>> diff --git a/include/linux/mfd/tmio.h b/include/linux/mfd/tmio.h
>> index 6b9c5d0..e405895 100644
>> --- a/include/linux/mfd/tmio.h
>> +++ b/include/linux/mfd/tmio.h
>> @@ -23,6 +23,7 @@
>> */
>> struct tmio_mmc_data {
>> const unsigned int hclk;
>> + const char *clk_name;
>
> Drop that.
Actually, this struct can be dropped completely and the HCLK rate can
be determined with clk_get_rate.
>> };
>>
>> /*
>> --
>> 1.6.2.4
>>
>> --
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>>
>
> Otherwise that patch doesn't seem wrong to me?
> As soon as we have the possibility for MFD drivers to provide their
> own clk API implementation, this should also work with ASIC3/TMIO.
> I'll try to register my ASIC3 HCLK with clkdev and see if this patch
> works.
>
> regards
> Philipp
>
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