From: Seungwon Jeon <tgih.jun@samsung.com> To: "'Thomas Abraham'" <thomas.abraham@linaro.org>, linux-mmc@vger.kernel.org, devicetree-discuss@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, cjb@laptop.org, grant.likely@secretlab.ca, rob.herring@calxeda.com, linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, patches@linaro.org Subject: RE: [PATCH 3/9] mmc: dw_mmc: lookup for optional biu and ciu clocks Date: Thu, 19 Jul 2012 19:27:25 +0900 [thread overview] Message-ID: <004201cd6599$17401610$45c04230$%jun@samsung.com> (raw) In-Reply-To: <1342521538-12790-1-git-send-email-thomas.abraham@linaro.org> July 17, 2012, Thomas Abraham <thomas.abraham@linaro.org> wrote: > Some platforms allow for clock gating and control of bus interface unit clock > and card interface unit clock. Add support for clock lookup of optional biu > and ciu clocks for clock gating and clock speed determination. > > Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> > Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> > --- > drivers/mmc/host/dw_mmc.c | 39 ++++++++++++++++++++++++++++++++++++--- > include/linux/mmc/dw_mmc.h | 4 ++++ > 2 files changed, 40 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index cd58063..ebd22d8 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -1953,13 +1953,30 @@ int dw_mci_probe(struct dw_mci *host) > return -ENODEV; > } > > - if (!host->pdata->bus_hz) { > + host->biu_clk = clk_get(host->dev, "biu"); > + if (IS_ERR(host->biu_clk)) > + dev_dbg(host->dev, "biu clock not available\n"); > + else > + clk_prepare_enable(host->biu_clk); > + > + host->ciu_clk = clk_get(host->dev, "ciu"); > + if (IS_ERR(host->ciu_clk)) > + dev_dbg(host->dev, "ciu clock not available\n"); > + else > + clk_prepare_enable(host->ciu_clk); > + > + if (IS_ERR(host->ciu_clk)) > + host->bus_hz = host->pdata->bus_hz; > + else > + host->bus_hz = clk_get_rate(host->ciu_clk); I have posted similar patch some time back. bus_hz represents input rate for cclk_in of mshc. Host of samsung soc doesn't use input clock from system directly. As you have introduced CLKSEL in your another patch, input clock can be changed prior to cclk_in. For non-samsung host, we don't need to consider this with generic way? Thanks, Seungwon Jeon > + > + if (!host->bus_hz) { > dev_err(host->dev, > "Platform data must supply bus speed\n"); > - return -ENODEV; > + ret = -ENODEV; > + goto err_clk; > } > > - host->bus_hz = host->pdata->bus_hz; > host->quirks = host->pdata->quirks; > > spin_lock_init(&host->lock); > @@ -2109,6 +2126,16 @@ err_dmaunmap: > regulator_disable(host->vmmc); > regulator_put(host->vmmc); > } > + > +err_clk: > + if (!IS_ERR(host->ciu_clk)) { > + clk_disable_unprepare(host->ciu_clk); > + clk_put(host->ciu_clk); > + } > + if (!IS_ERR(host->biu_clk)) { > + clk_disable_unprepare(host->biu_clk); > + clk_put(host->biu_clk); > + } > return ret; > } > EXPORT_SYMBOL(dw_mci_probe); > @@ -2142,6 +2169,12 @@ void dw_mci_remove(struct dw_mci *host) > regulator_put(host->vmmc); > } > > + if (!IS_ERR(host->ciu_clk)) > + clk_disable_unprepare(host->ciu_clk); > + if (!IS_ERR(host->biu_clk)) > + clk_disable_unprepare(host->biu_clk); > + clk_put(host->ciu_clk); > + clk_put(host->biu_clk); > } > EXPORT_SYMBOL(dw_mci_remove); > > diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h > index a37a573..787ad56 100644 > --- a/include/linux/mmc/dw_mmc.h > +++ b/include/linux/mmc/dw_mmc.h > @@ -78,6 +78,8 @@ struct mmc_data; > * @data_offset: Set the offset of DATA register according to VERID. > * @dev: Device associated with the MMC controller. > * @pdata: Platform data associated with the MMC controller. > + * @biu_clk: Pointer to bus interface unit clock instance. > + * @ciu_clk: Pointer to card interface unit clock instance. > * @slot: Slots sharing this MMC controller. > * @fifo_depth: depth of FIFO. > * @data_shift: log2 of FIFO item size. > @@ -158,6 +160,8 @@ struct dw_mci { > u16 data_offset; > struct device *dev; > struct dw_mci_board *pdata; > + struct clk *biu_clk; > + struct clk *ciu_clk; > struct dw_mci_slot *slot[MAX_MCI_SLOTS]; > > /* FIFO push and pull */ > -- > 1.6.6.rc2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: tgih.jun@samsung.com (Seungwon Jeon) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 3/9] mmc: dw_mmc: lookup for optional biu and ciu clocks Date: Thu, 19 Jul 2012 19:27:25 +0900 [thread overview] Message-ID: <004201cd6599$17401610$45c04230$%jun@samsung.com> (raw) In-Reply-To: <1342521538-12790-1-git-send-email-thomas.abraham@linaro.org> July 17, 2012, Thomas Abraham <thomas.abraham@linaro.org> wrote: > Some platforms allow for clock gating and control of bus interface unit clock > and card interface unit clock. Add support for clock lookup of optional biu > and ciu clocks for clock gating and clock speed determination. > > Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> > Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> > --- > drivers/mmc/host/dw_mmc.c | 39 ++++++++++++++++++++++++++++++++++++--- > include/linux/mmc/dw_mmc.h | 4 ++++ > 2 files changed, 40 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index cd58063..ebd22d8 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -1953,13 +1953,30 @@ int dw_mci_probe(struct dw_mci *host) > return -ENODEV; > } > > - if (!host->pdata->bus_hz) { > + host->biu_clk = clk_get(host->dev, "biu"); > + if (IS_ERR(host->biu_clk)) > + dev_dbg(host->dev, "biu clock not available\n"); > + else > + clk_prepare_enable(host->biu_clk); > + > + host->ciu_clk = clk_get(host->dev, "ciu"); > + if (IS_ERR(host->ciu_clk)) > + dev_dbg(host->dev, "ciu clock not available\n"); > + else > + clk_prepare_enable(host->ciu_clk); > + > + if (IS_ERR(host->ciu_clk)) > + host->bus_hz = host->pdata->bus_hz; > + else > + host->bus_hz = clk_get_rate(host->ciu_clk); I have posted similar patch some time back. bus_hz represents input rate for cclk_in of mshc. Host of samsung soc doesn't use input clock from system directly. As you have introduced CLKSEL in your another patch, input clock can be changed prior to cclk_in. For non-samsung host, we don't need to consider this with generic way? Thanks, Seungwon Jeon > + > + if (!host->bus_hz) { > dev_err(host->dev, > "Platform data must supply bus speed\n"); > - return -ENODEV; > + ret = -ENODEV; > + goto err_clk; > } > > - host->bus_hz = host->pdata->bus_hz; > host->quirks = host->pdata->quirks; > > spin_lock_init(&host->lock); > @@ -2109,6 +2126,16 @@ err_dmaunmap: > regulator_disable(host->vmmc); > regulator_put(host->vmmc); > } > + > +err_clk: > + if (!IS_ERR(host->ciu_clk)) { > + clk_disable_unprepare(host->ciu_clk); > + clk_put(host->ciu_clk); > + } > + if (!IS_ERR(host->biu_clk)) { > + clk_disable_unprepare(host->biu_clk); > + clk_put(host->biu_clk); > + } > return ret; > } > EXPORT_SYMBOL(dw_mci_probe); > @@ -2142,6 +2169,12 @@ void dw_mci_remove(struct dw_mci *host) > regulator_put(host->vmmc); > } > > + if (!IS_ERR(host->ciu_clk)) > + clk_disable_unprepare(host->ciu_clk); > + if (!IS_ERR(host->biu_clk)) > + clk_disable_unprepare(host->biu_clk); > + clk_put(host->ciu_clk); > + clk_put(host->biu_clk); > } > EXPORT_SYMBOL(dw_mci_remove); > > diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h > index a37a573..787ad56 100644 > --- a/include/linux/mmc/dw_mmc.h > +++ b/include/linux/mmc/dw_mmc.h > @@ -78,6 +78,8 @@ struct mmc_data; > * @data_offset: Set the offset of DATA register according to VERID. > * @dev: Device associated with the MMC controller. > * @pdata: Platform data associated with the MMC controller. > + * @biu_clk: Pointer to bus interface unit clock instance. > + * @ciu_clk: Pointer to card interface unit clock instance. > * @slot: Slots sharing this MMC controller. > * @fifo_depth: depth of FIFO. > * @data_shift: log2 of FIFO item size. > @@ -158,6 +160,8 @@ struct dw_mci { > u16 data_offset; > struct device *dev; > struct dw_mci_board *pdata; > + struct clk *biu_clk; > + struct clk *ciu_clk; > struct dw_mci_slot *slot[MAX_MCI_SLOTS]; > > /* FIFO push and pull */ > -- > 1.6.6.rc2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2012-07-19 10:27 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-07-12 12:54 [PATCH v3 0/6] mmc: dw_mmc: add support for device tree based instantiation Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` [PATCH v3 1/6] mmc: dw_mmc: convert copy of struct device in struct dw_mci to a reference Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` [PATCH v3 2/6] mmc: dw_mmc: allow probe to succeed even if one slot is initialized Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` [PATCH v3 3/6] mmc: dw_mmc: lookup for optional biu and ciu clocks Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-13 9:11 ` Girish K S 2012-07-13 9:11 ` Girish K S 2012-07-17 10:38 ` [PATCH 3/9] " Thomas Abraham 2012-07-17 10:38 ` Thomas Abraham 2012-07-19 10:27 ` Seungwon Jeon [this message] 2012-07-19 10:27 ` Seungwon Jeon 2012-07-12 12:54 ` [PATCH v3 4/6] mmc: dw_mmc: add quirk to indicate missing write protect line Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-12 12:54 ` [PATCH v3 5/6] mmc: dw_mmc: add device tree support Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-16 4:15 ` Girish K S 2012-07-16 4:15 ` Girish K S 2012-07-16 4:30 ` Girish K S 2012-07-16 4:30 ` Girish K S 2012-07-17 10:19 ` Thomas Abraham 2012-07-17 10:19 ` Thomas Abraham 2012-07-16 4:23 ` Chris Ball 2012-07-16 4:23 ` Chris Ball 2012-07-17 10:21 ` Thomas Abraham 2012-07-17 10:21 ` Thomas Abraham 2012-07-17 10:21 ` Thomas Abraham 2012-07-17 10:37 ` [PATCH 5/9] " Thomas Abraham 2012-07-17 10:37 ` Thomas Abraham 2012-07-12 12:54 ` [PATCH v3 6/6] mmc: dw_mmc: add samsung exynos5250 specific extentions Thomas Abraham 2012-07-12 12:54 ` Thomas Abraham 2012-07-19 3:51 ` Seungwon Jeon 2012-07-19 3:51 ` Seungwon Jeon 2012-07-19 18:48 ` Thomas Abraham 2012-07-19 18:48 ` Thomas Abraham 2012-07-20 10:38 ` Seungwon Jeon 2012-07-20 10:38 ` Seungwon Jeon 2012-07-23 6:17 ` Thomas Abraham 2012-07-23 6:17 ` Thomas Abraham 2012-07-23 9:59 ` Seungwon Jeon 2012-07-23 9:59 ` Seungwon Jeon 2012-07-19 15:28 ` [PATCH v3 0/6] mmc: dw_mmc: add support for device tree based instantiation Jaehoon Chung 2012-07-19 15:28 ` Jaehoon Chung 2012-07-19 18:59 ` Thomas Abraham 2012-07-19 18:59 ` Thomas Abraham 2012-07-19 22:47 ` Kukjin Kim 2012-07-19 22:47 ` Kukjin Kim 2012-07-23 1:57 ` Jaehoon Chung 2012-07-23 1:57 ` Jaehoon Chung
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