| Message ID | 3bf827929a44c17bfb1bf1000b143c02ce26a929.1693102324.git.daniel@makrotopia.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | i2c: mt65xx: allow optional pmic clock | expand |
Hi Daniel, On Sun, Aug 27, 2023 at 03:13:30AM +0100, Daniel Golle wrote: > Using the I2C host controller on the MT7981 SoC requires 4 clocks to > be enabled. One of them, the pmic clk, is only enabled in case > 'mediatek,have-pmic' is also set which has other consequences which > are not desired in this case. > > Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty > is not present and the bus is not used to connect to a pmic, but may > still require to enable the pmic clock. > > Signed-off-by: Daniel Golle <daniel@makrotopia.org> > --- > drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c > index 1a9b5a068ef1b..a8b5719c33729 100644 > --- a/drivers/i2c/busses/i2c-mt65xx.c > +++ b/drivers/i2c/busses/i2c-mt65xx.c > @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) > if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) > return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); > > + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); > + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > + dev_err(&pdev->dev, "cannot get pmic clock\n"); > + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); you could have used dev_err_probe() here, but on the other hand it would be inconsistent because it's not used anywhere in this driver... so that it looks good to me: Reviewed-by: Andi Shyti <andi.shyti@kernel.org> Andi
Il 27/08/23 04:13, Daniel Golle ha scritto: > Using the I2C host controller on the MT7981 SoC requires 4 clocks to > be enabled. One of them, the pmic clk, is only enabled in case > 'mediatek,have-pmic' is also set which has other consequences which > are not desired in this case. > > Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty > is not present and the bus is not used to connect to a pmic, but may > still require to enable the pmic clock. > > Signed-off-by: Daniel Golle <daniel@makrotopia.org> > --- > drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c > index 1a9b5a068ef1b..a8b5719c33729 100644 > --- a/drivers/i2c/busses/i2c-mt65xx.c > +++ b/drivers/i2c/busses/i2c-mt65xx.c > @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) > if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) > return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); > > + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); > + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > + dev_err(&pdev->dev, "cannot get pmic clock\n"); > + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > + } > + > if (i2c->have_pmic) { ...but you're not changing speed_clk if !i2c->have_pmic, I'm not sure that this will work correctly. Perhaps you wanted to also set speed_clk if the clock is present? if (IS_ERR...) { error handling } else if (clk is present) speed_clk = I2C_MT65XX_CLK_PMIC; if (have_pmic && !clk_is_present) error Regards, Angelo > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get(&pdev->dev, "pmic"); > - if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > + if (!i2c->clocks[I2C_MT65XX_CLK_PMIC].clk) { > dev_err(&pdev->dev, "cannot get pmic clock\n"); > - return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > + return -ENODEV; > } > speed_clk = I2C_MT65XX_CLK_PMIC; > } else { > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = NULL; > speed_clk = I2C_MT65XX_CLK_MAIN; > } >
On Wed, Sep 13, 2023 at 04:00:53PM +0200, AngeloGioacchino Del Regno wrote: > Il 27/08/23 04:13, Daniel Golle ha scritto: > > Using the I2C host controller on the MT7981 SoC requires 4 clocks to > > be enabled. One of them, the pmic clk, is only enabled in case > > 'mediatek,have-pmic' is also set which has other consequences which > > are not desired in this case. > > > > Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty > > is not present and the bus is not used to connect to a pmic, but may > > still require to enable the pmic clock. > > > > Signed-off-by: Daniel Golle <daniel@makrotopia.org> > > --- > > drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- > > 1 file changed, 8 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c > > index 1a9b5a068ef1b..a8b5719c33729 100644 > > --- a/drivers/i2c/busses/i2c-mt65xx.c > > +++ b/drivers/i2c/busses/i2c-mt65xx.c > > @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) > > if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) > > return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); > > + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); > > + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > > + dev_err(&pdev->dev, "cannot get pmic clock\n"); > > + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > > + } > > + > > if (i2c->have_pmic) { > > ...but you're not changing speed_clk if !i2c->have_pmic, I'm not sure that > this will work correctly. Perhaps you wanted to also set speed_clk if the > clock is present? No, if I wanted that I could have used the existing 'mediatek,have-pmic' property -- however, all needed e.g. on MT7981 is to make sure the clock is enabled, but still use I2C_MT65XX_CLK_MAIN as speed_clk. > > if (IS_ERR...) { > error handling > } else if (clk is present) > speed_clk = I2C_MT65XX_CLK_PMIC; > > if (have_pmic && !clk_is_present) > error > > Regards, > Angelo > > > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get(&pdev->dev, "pmic"); > > - if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > > + if (!i2c->clocks[I2C_MT65XX_CLK_PMIC].clk) { > > dev_err(&pdev->dev, "cannot get pmic clock\n"); > > - return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > > + return -ENODEV; > > } > > speed_clk = I2C_MT65XX_CLK_PMIC; > > } else { > > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = NULL; > > speed_clk = I2C_MT65XX_CLK_MAIN; > > } > >
Il 14/09/23 11:07, Daniel Golle ha scritto: > On Wed, Sep 13, 2023 at 04:00:53PM +0200, AngeloGioacchino Del Regno wrote: >> Il 27/08/23 04:13, Daniel Golle ha scritto: >>> Using the I2C host controller on the MT7981 SoC requires 4 clocks to >>> be enabled. One of them, the pmic clk, is only enabled in case >>> 'mediatek,have-pmic' is also set which has other consequences which >>> are not desired in this case. >>> >>> Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty >>> is not present and the bus is not used to connect to a pmic, but may >>> still require to enable the pmic clock. >>> >>> Signed-off-by: Daniel Golle <daniel@makrotopia.org> >>> --- >>> drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- >>> 1 file changed, 8 insertions(+), 4 deletions(-) >>> >>> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c >>> index 1a9b5a068ef1b..a8b5719c33729 100644 >>> --- a/drivers/i2c/busses/i2c-mt65xx.c >>> +++ b/drivers/i2c/busses/i2c-mt65xx.c >>> @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) >>> if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) >>> return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); >>> + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); >>> + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { >>> + dev_err(&pdev->dev, "cannot get pmic clock\n"); >>> + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); >>> + } >>> + >>> if (i2c->have_pmic) { >> >> ...but you're not changing speed_clk if !i2c->have_pmic, I'm not sure that >> this will work correctly. Perhaps you wanted to also set speed_clk if the >> clock is present? > > No, if I wanted that I could have used the existing 'mediatek,have-pmic' > property -- however, all needed e.g. on MT7981 is to make sure the > clock is enabled, but still use I2C_MT65XX_CLK_MAIN as speed_clk. > Sorry, I've misunderstood the intention and yes, I understand now. Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
On Sun, Aug 27, 2023 at 03:13:30AM +0100, Daniel Golle wrote: > Using the I2C host controller on the MT7981 SoC requires 4 clocks to > be enabled. One of them, the pmic clk, is only enabled in case > 'mediatek,have-pmic' is also set which has other consequences which > are not desired in this case. > > Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty > is not present and the bus is not used to connect to a pmic, but may > still require to enable the pmic clock. > > Signed-off-by: Daniel Golle <daniel@makrotopia.org> Applied to for-next, thanks!
diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 1a9b5a068ef1b..a8b5719c33729 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { + dev_err(&pdev->dev, "cannot get pmic clock\n"); + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); + } + if (i2c->have_pmic) { - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get(&pdev->dev, "pmic"); - if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { + if (!i2c->clocks[I2C_MT65XX_CLK_PMIC].clk) { dev_err(&pdev->dev, "cannot get pmic clock\n"); - return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); + return -ENODEV; } speed_clk = I2C_MT65XX_CLK_PMIC; } else { - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = NULL; speed_clk = I2C_MT65XX_CLK_MAIN; }
Using the I2C host controller on the MT7981 SoC requires 4 clocks to be enabled. One of them, the pmic clk, is only enabled in case 'mediatek,have-pmic' is also set which has other consequences which are not desired in this case. Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty is not present and the bus is not used to connect to a pmic, but may still require to enable the pmic clock. Signed-off-by: Daniel Golle <daniel@makrotopia.org> --- drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)