* [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property @ 2019-06-13 11:31 Dinh Nguyen 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen ` (2 more replies) 0 siblings, 3 replies; 8+ messages in thread From: Dinh Nguyen @ 2019-06-13 11:31 UTC (permalink / raw) To: linux-mtd Cc: marex, bbrezillon, tudor.ambarus, linux-kernel, dinguyen, computersforpeace, dwmw2 The QSPI module can have an optional reset signals that will hold the module in a reset state. Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> --- v6: no change v5: document reset-names v4: no change v3: created base on review comments v2: did not exist v1: did not exist --- Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt index 4345c3a6f530..945be7d5b236 100644 --- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt +++ b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt @@ -35,6 +35,9 @@ custom properties: (qspi_n_ss_out). - cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low and first bit transfer. +- resets : Must contain an entry for each entry in reset-names. + See ../reset/reset.txt for details. +- reset-names : Must include either "qspi" and/or "qspi-ocp". Example: @@ -50,6 +53,8 @@ Example: cdns,fifo-depth = <128>; cdns,fifo-width = <4>; cdns,trigger-address = <0x00000000>; + resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>; + reset-names = "qspi", "qspi-ocp"; flash0: n25q00@0 { ... -- 2.20.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control 2019-06-13 11:31 [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Dinh Nguyen @ 2019-06-13 11:31 ` Dinh Nguyen 2019-06-22 10:21 ` Tudor.Ambarus ` (2 more replies) 2019-06-18 9:10 ` [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Tudor.Ambarus 2019-06-28 8:22 ` Tudor.Ambarus 2 siblings, 3 replies; 8+ messages in thread From: Dinh Nguyen @ 2019-06-13 11:31 UTC (permalink / raw) To: linux-mtd Cc: marex, Tien-Fong Chee, bbrezillon, tudor.ambarus, linux-kernel, dinguyen, computersforpeace, dwmw2 Get the reset control properties for the QSPI controller and bring them out of reset. Most will have just one reset bit, but there is an additional OCP reset bit that is used ECC. The OCP reset bit will also need to get de-asserted as well. [1] The reason this patch is needed is in the case where a bootloader leaves the QSPI controller in a reset state, or a state where init cannot occur successfully, the patch will put the QSPI controller into a clean state. [1] https://www.intel.com/content/www/us/en/programmable/hps/arria-10/hps.html#reg_soc_top/sfo1429890575955.html Suggested-by: Tien-Fong Chee <tien.fong.chee@intel.com> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> --- v6: no need to check for reset pointer in assert/deassert as the call to assert/deassert is already doing the checking v5: remove udelay(not needed) on tested hardware group reset assert/deassert together update commit message with reasoning for patch v4: fix compile error v3: return full error by using PTR_ERR(rtsc) move reset control calls until after the clock enables use udelay(2) to be safe Add optional OCP(Open Core Protocol) reset signal v2: use devm_reset_control_get_optional_exclusive print an error message return -EPROBE_DEFER --- drivers/mtd/spi-nor/cadence-quadspi.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c index 792628750eec..732323c2adb1 100644 --- a/drivers/mtd/spi-nor/cadence-quadspi.c +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -34,6 +34,7 @@ #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include <linux/sched.h> #include <linux/spi/spi.h> #include <linux/timer.h> @@ -1336,6 +1337,8 @@ static int cqspi_probe(struct platform_device *pdev) struct cqspi_st *cqspi; struct resource *res; struct resource *res_ahb; + struct reset_control *rstc; + struct reset_control *rstc_ocp; const struct cqspi_driver_platdata *ddata; int ret; int irq; @@ -1402,6 +1405,25 @@ static int cqspi_probe(struct platform_device *pdev) goto probe_clk_failed; } + /* Obtain QSPI reset control */ + rstc = devm_reset_control_get_optional_exclusive(dev, "qspi"); + if (IS_ERR(rstc)) { + dev_err(dev, "Cannot get QSPI reset.\n"); + return PTR_ERR(rstc); + } + + rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp"); + if (IS_ERR(rstc_ocp)) { + dev_err(dev, "Cannot get QSPI OCP reset.\n"); + return PTR_ERR(rstc_ocp); + } + + reset_control_assert(rstc); + reset_control_deassert(rstc); + + reset_control_assert(rstc_ocp); + reset_control_deassert(rstc_ocp); + cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); ddata = of_device_get_match_data(dev); if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY)) -- 2.20.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen @ 2019-06-22 10:21 ` Tudor.Ambarus 2019-06-24 14:50 ` Dinh Nguyen 2019-06-27 13:28 ` Vignesh Raghavendra 2019-06-28 8:23 ` Tudor.Ambarus 2 siblings, 1 reply; 8+ messages in thread From: Tudor.Ambarus @ 2019-06-22 10:21 UTC (permalink / raw) To: dinguyen, linux-mtd Cc: marex, tien.fong.chee, bbrezillon, linux-kernel, computersforpeace, dwmw2 Hi, Dinh, On 06/13/2019 02:31 PM, Dinh Nguyen wrote: > + struct reset_control *rstc; > + struct reset_control *rstc_ocp; I'll add these on a single line when applying. The patch is good, I'm waiting for Rob to review the bindings. Thanks, ta ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control 2019-06-22 10:21 ` Tudor.Ambarus @ 2019-06-24 14:50 ` Dinh Nguyen 0 siblings, 0 replies; 8+ messages in thread From: Dinh Nguyen @ 2019-06-24 14:50 UTC (permalink / raw) To: Tudor.Ambarus, linux-mtd Cc: marex, tien.fong.chee, bbrezillon, linux-kernel, computersforpeace, dwmw2 Hi Tudor, On 6/22/19 5:21 AM, Tudor.Ambarus@microchip.com wrote: > Hi, Dinh, > > On 06/13/2019 02:31 PM, Dinh Nguyen wrote: >> + struct reset_control *rstc; >> + struct reset_control *rstc_ocp; > > I'll add these on a single line when applying. The patch is good, I'm waiting > for Rob to review the bindings. > Thanks! Dinh ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen 2019-06-22 10:21 ` Tudor.Ambarus @ 2019-06-27 13:28 ` Vignesh Raghavendra 2019-06-28 8:23 ` Tudor.Ambarus 2 siblings, 0 replies; 8+ messages in thread From: Vignesh Raghavendra @ 2019-06-27 13:28 UTC (permalink / raw) To: Dinh Nguyen, linux-mtd Cc: marex, Tien-Fong Chee, tudor.ambarus, bbrezillon, linux-kernel, computersforpeace, dwmw2 On 13/06/19 5:01 PM, Dinh Nguyen wrote: > Get the reset control properties for the QSPI controller and bring them > out of reset. Most will have just one reset bit, but there is an additional > OCP reset bit that is used ECC. The OCP reset bit will also need to get > de-asserted as well. [1] > > The reason this patch is needed is in the case where a bootloader leaves > the QSPI controller in a reset state, or a state where init cannot occur > successfully, the patch will put the QSPI controller into a clean state. > > [1] https://www.intel.com/content/www/us/en/programmable/hps/arria-10/hps.html#reg_soc_top/sfo1429890575955.html > > Suggested-by: Tien-Fong Chee <tien.fong.chee@intel.com> > Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> > --- Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com> Regards Vignesh > v6: no need to check for reset pointer in assert/deassert as the call to > assert/deassert is already doing the checking > v5: remove udelay(not needed) on tested hardware > group reset assert/deassert together > update commit message with reasoning for patch > v4: fix compile error > v3: return full error by using PTR_ERR(rtsc) > move reset control calls until after the clock enables > use udelay(2) to be safe > Add optional OCP(Open Core Protocol) reset signal > v2: use devm_reset_control_get_optional_exclusive > print an error message > return -EPROBE_DEFER > --- > drivers/mtd/spi-nor/cadence-quadspi.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c > index 792628750eec..732323c2adb1 100644 > --- a/drivers/mtd/spi-nor/cadence-quadspi.c > +++ b/drivers/mtd/spi-nor/cadence-quadspi.c > @@ -34,6 +34,7 @@ > #include <linux/of.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > +#include <linux/reset.h> > #include <linux/sched.h> > #include <linux/spi/spi.h> > #include <linux/timer.h> > @@ -1336,6 +1337,8 @@ static int cqspi_probe(struct platform_device *pdev) > struct cqspi_st *cqspi; > struct resource *res; > struct resource *res_ahb; > + struct reset_control *rstc; > + struct reset_control *rstc_ocp; > const struct cqspi_driver_platdata *ddata; > int ret; > int irq; > @@ -1402,6 +1405,25 @@ static int cqspi_probe(struct platform_device *pdev) > goto probe_clk_failed; > } > > + /* Obtain QSPI reset control */ > + rstc = devm_reset_control_get_optional_exclusive(dev, "qspi"); > + if (IS_ERR(rstc)) { > + dev_err(dev, "Cannot get QSPI reset.\n"); > + return PTR_ERR(rstc); > + } > + > + rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp"); > + if (IS_ERR(rstc_ocp)) { > + dev_err(dev, "Cannot get QSPI OCP reset.\n"); > + return PTR_ERR(rstc_ocp); > + } > + > + reset_control_assert(rstc); > + reset_control_deassert(rstc); > + > + reset_control_assert(rstc_ocp); > + reset_control_deassert(rstc_ocp); > + > cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); > ddata = of_device_get_match_data(dev); > if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY)) > -- Regards Vignesh ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen 2019-06-22 10:21 ` Tudor.Ambarus 2019-06-27 13:28 ` Vignesh Raghavendra @ 2019-06-28 8:23 ` Tudor.Ambarus 2 siblings, 0 replies; 8+ messages in thread From: Tudor.Ambarus @ 2019-06-28 8:23 UTC (permalink / raw) To: dinguyen, linux-mtd Cc: marex, tien.fong.chee, bbrezillon, linux-kernel, computersforpeace, dwmw2 On 06/13/2019 02:31 PM, Dinh Nguyen wrote: > External E-Mail > > > Get the reset control properties for the QSPI controller and bring them > out of reset. Most will have just one reset bit, but there is an additional > OCP reset bit that is used ECC. The OCP reset bit will also need to get > de-asserted as well. [1] > > The reason this patch is needed is in the case where a bootloader leaves > the QSPI controller in a reset state, or a state where init cannot occur > successfully, the patch will put the QSPI controller into a clean state. > > [1] https://www.intel.com/content/www/us/en/programmable/hps/arria-10/hps.html#reg_soc_top/sfo1429890575955.html > > Suggested-by: Tien-Fong Chee <tien.fong.chee@intel.com> > Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> > --- > v6: no need to check for reset pointer in assert/deassert as the call to > assert/deassert is already doing the checking > v5: remove udelay(not needed) on tested hardware > group reset assert/deassert together > update commit message with reasoning for patch > v4: fix compile error > v3: return full error by using PTR_ERR(rtsc) > move reset control calls until after the clock enables > use udelay(2) to be safe > Add optional OCP(Open Core Protocol) reset signal > v2: use devm_reset_control_get_optional_exclusive > print an error message > return -EPROBE_DEFER > --- > drivers/mtd/spi-nor/cadence-quadspi.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c > index 792628750eec..732323c2adb1 100644 > --- a/drivers/mtd/spi-nor/cadence-quadspi.c > +++ b/drivers/mtd/spi-nor/cadence-quadspi.c > @@ -34,6 +34,7 @@ > #include <linux/of.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > +#include <linux/reset.h> > #include <linux/sched.h> > #include <linux/spi/spi.h> > #include <linux/timer.h> > @@ -1336,6 +1337,8 @@ static int cqspi_probe(struct platform_device *pdev) > struct cqspi_st *cqspi; > struct resource *res; > struct resource *res_ahb; > + struct reset_control *rstc; > + struct reset_control *rstc_ocp; declare rstc and rstc_ocp on the same line and Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git, spi-nor/next branch. Thanks, ta > const struct cqspi_driver_platdata *ddata; > int ret; > int irq; > @@ -1402,6 +1405,25 @@ static int cqspi_probe(struct platform_device *pdev) > goto probe_clk_failed; > } > > + /* Obtain QSPI reset control */ > + rstc = devm_reset_control_get_optional_exclusive(dev, "qspi"); > + if (IS_ERR(rstc)) { > + dev_err(dev, "Cannot get QSPI reset.\n"); > + return PTR_ERR(rstc); > + } > + > + rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp"); > + if (IS_ERR(rstc_ocp)) { > + dev_err(dev, "Cannot get QSPI OCP reset.\n"); > + return PTR_ERR(rstc_ocp); > + } > + > + reset_control_assert(rstc); > + reset_control_deassert(rstc); > + > + reset_control_assert(rstc_ocp); > + reset_control_deassert(rstc_ocp); > + > cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); > ddata = of_device_get_match_data(dev); > if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY)) > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property 2019-06-13 11:31 [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Dinh Nguyen 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen @ 2019-06-18 9:10 ` Tudor.Ambarus 2019-06-28 8:22 ` Tudor.Ambarus 2 siblings, 0 replies; 8+ messages in thread From: Tudor.Ambarus @ 2019-06-18 9:10 UTC (permalink / raw) To: dinguyen, robh Cc: marex, devicetree, bbrezillon, linux-kernel, linux-mtd, computersforpeace, dwmw2 +Rob, devicetree@vger.kernel.org Hi, Rob, Dinh forgot to send this to the device tree mailing list. Would you please review it? Thanks, ta On 06/13/2019 02:31 PM, Dinh Nguyen wrote: > External E-Mail > > > The QSPI module can have an optional reset signals that will hold the > module in a reset state. > > Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> > --- > v6: no change > v5: document reset-names > v4: no change > v3: created base on review comments > v2: did not exist > v1: did not exist > --- > Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt > index 4345c3a6f530..945be7d5b236 100644 > --- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt > +++ b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt > @@ -35,6 +35,9 @@ custom properties: > (qspi_n_ss_out). > - cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low > and first bit transfer. > +- resets : Must contain an entry for each entry in reset-names. > + See ../reset/reset.txt for details. > +- reset-names : Must include either "qspi" and/or "qspi-ocp". > > Example: > > @@ -50,6 +53,8 @@ Example: > cdns,fifo-depth = <128>; > cdns,fifo-width = <4>; > cdns,trigger-address = <0x00000000>; > + resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>; > + reset-names = "qspi", "qspi-ocp"; > > flash0: n25q00@0 { > ... > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property 2019-06-13 11:31 [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Dinh Nguyen 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen 2019-06-18 9:10 ` [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Tudor.Ambarus @ 2019-06-28 8:22 ` Tudor.Ambarus 2 siblings, 0 replies; 8+ messages in thread From: Tudor.Ambarus @ 2019-06-28 8:22 UTC (permalink / raw) To: linux-mtd On 06/13/2019 02:31 PM, Dinh Nguyen wrote: > External E-Mail > > > The QSPI module can have an optional reset signals that will hold the > module in a reset state. > > Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> > --- > v6: no change > v5: document reset-names > v4: no change > v3: created base on review comments > v2: did not exist > v1: did not exist > --- > Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 5 +++++ > 1 file changed, 5 insertions(+) > Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git, spi-nor/next branch. Thanks, ta ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2019-06-28 8:23 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2019-06-13 11:31 [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Dinh Nguyen 2019-06-13 11:31 ` [PATCHv6 2/2] mtd: spi-nor: cadence-quadspi: add reset control Dinh Nguyen 2019-06-22 10:21 ` Tudor.Ambarus 2019-06-24 14:50 ` Dinh Nguyen 2019-06-27 13:28 ` Vignesh Raghavendra 2019-06-28 8:23 ` Tudor.Ambarus 2019-06-18 9:10 ` [PATCHv6 1/2] dt-bindings: cadence-quadspi: add options reset property Tudor.Ambarus 2019-06-28 8:22 ` Tudor.Ambarus
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).